Chandra Cycle 6 Science Programs
Projects are grouped into the following categories.
- Solar System
- Normal Stars and WD
- WD Binaries and CV
- BH and NS Binaries
- SN, SNR, and Isolated NS
- Normal Galaxies: Diffuse Emission
- Normal Galaxies: X-Ray Populations
- Active Galaxies and Quasars
- Clusters of Galaxies
- Extragalactic Diffuse Emission and Surveys
- Galactic Diffuse Emission and Surveys
***********************************************************************************
SOLAR SYSTEM
--------------------------------------------------
===================================================================================
Proposal Number: 06100312
Proposal Title: Comet 9P/Tempel 1 During the Deep Impact Encounter
PI: Carey Lisse
Subject Category: SOLAR SYSTEM
Abstract: We propose a series of observations of the periodic comet 9P/Tempel 1
in conjunction with NASA's Deep Impact mission. This mission is a spacecraft that
will release a 370 kg impactor into the nucleus of the comet on July 4, 2005 at
high relative velocity. Our primary objective is to study the generation of
prompt x-rays in the impact plume and the change in charge exchange created
x-rays as the impact ejecta propgates through the neutral coma. To this end we
plan to obtain ACIS-S imaging spectroscopy before, during, and following the
impact.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
9P/Tempel 1 ACIS-S NONE 25.00
9P/Tempel 1 ACIS-S NONE 25.00
9P/Tempel 1 ACIS-S NONE 25.00
9P/Tempel 1 ACIS-S NONE 25.00
9P/Tempel 1 ACIS-S NONE 50.00
9P/Tempel 1 ACIS-S NONE 150.00
***********************************************************************************
STARS AND WD
--------------------------------------------------
===================================================================================
Proposal Number: 06200016
Proposal Title: Star formation in the young star cluster NGC 6231
PI: Stephen Murray
Subject Category: STARS AND WD
Abstract: A 100 ksec ACIS-I observation of the very young star cluster NGC 6231
will probe a suspected strong deficit of low-mass stars in this cluster. For a
cluster of the age and distance of NGC 6231, Chandra X-ray observations are
uniquely suited to efficiently select low-mass pre-main-sequence members that are
virtually unidentifiable by any other means. Finding the low-mass cluster
population will have strong implications for our knowledge of different aspects
of the stellar formation process, from the initial mass function to mass
segregation, and from star formation history and sequential star formation to
star formation efficiency. The proposed observation can test definitely whether
or not star formation in NGC 6231 has been peculiar, i.e., in yielding very few
low-mass stars.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
16:54:14.20 -41:49:36.50 NGC 6231 ACIS-I NONE 90.00
===================================================================================
Proposal Number: 06200050
Proposal Title: Alternate: A Search for X-ray Activity from a Mass-Accreting
Young Massive Star in NGC7538 with ACIS-I
PI: Gordon Garmire
Subject Category: STARS AND WD
Abstract: Using ACIS-I, we propose to observe a Galactic HII region (NGC7538) in
search for X-ray activities from an unambiguous sample of massive young stars in
the mass accretion phase. By comparing its X-ray features with those of massive
ZAMS stars and low-mass pre--main-sequence stars, we will investigate the X-ray
emission mechanism of massive young stars and how much contribution they make to
the diffuse X-ray emission of HII regions and to the Galactic ridge emission.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
23:13:45.00 +61:28:09.00 NGC7538 ACIS-I NONE 30.00
===================================================================================
Proposal Number: 06200059
Proposal Title: Search for beta Pic analogs
PI: Gordon Garmire
Subject Category: STARS AND WD
Abstract: The nearby star beta Pic, prototype for intermediate-mass stars with
dusty disks associated with planet formation, has recently been shown to be part
of a kinematical moving group associated with the very young Oph-Sco-Cen OB
association. This continues our ACIS snapshot program directed at other nearby
intermediate-mass stars with similar kinematical properties.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
03:11:56.20 +74:23:38.00 HR 932 ACIS-I NONE 3.00
05:13:25.70 +38:29:05.00 mu Aur ACIS-I NONE 3.00
05:39:31.50 -03:33:53.00 HR 1940 ACIS-I NONE 3.00
09:08:52.40 +51:36:17.00 f UMa ACIS-I NONE 3.00
10:43:02.00 +26:19:32.00 40 LMi ACIS-I NONE 3.00
12:35:45.60 -41:01:19.00 HR 4794 ACIS-I NONE 3.00
21:24:11.40 -12:52:41.00 18 Aqr ACIS-I NONE 3.00
===================================================================================
Proposal Number: 06200079
Proposal Title: X-ray emission from fast moving shocks in the protostellar jet
HH 154: a binding diagnostic of the emission mechanism
PI: Fabio Favata
Subject Category: STARS AND WD
Abstract: We propose to determine the proper motion of the X-ray source
associated with HH 154, the only known protostellar jet in which the X-ray
emission mechanism can be studied in detail. Our numerical simulations indicate
that the X-rays are produced in a fast-moving (500 km/s) post-shock region, and
our HST observations show high proper motion shocked material moving at similar
speed. Detection (or lack of) of proper motion of the X-ray source will strongly
confirm (or falsify) our model, and constitute the basis for a general theory of
X-ray emission in protostellar jets. Understanding and modeling the emission
mechanism is key to assess the lifetime of the X-ray emission and thus the
influence of X-ray from protostellar jets on the star (and planetary) formation
process in general.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
04:31:32.70 +18:08:08.00 HH 154 ACIS-I NONE 100.00
===================================================================================
Proposal Number: 06200093
Proposal Title: X-ray Imaging of McNeil's Star: Witnessing the Onset of an
Accretion Burst
PI: Joel Kastner
Subject Category: STARS AND WD
Abstract: It is widely accepted that most if not all Sunlike stars experience one
or more FU Ori (FUor) phases - episodes of exceedingly high accretion rate -
during their pre-main-sequence evolution. However, no FUor has yet been studied
during outburst onset. We propose to monitor the X-ray luminosity and spectral
distribution of McNeil's Star, a candidate FUor recently (Jan. 2004) caught
during its rise phase. As McNeil's Star was serendipitously detected as a weak
X-ray source by CXO prior to outburst, the proposed monitoring campaign will
constitute a unique test of the hypothesis that accretion processes are
responsible for X-ray emission from pre-MS stars. This opportunity is unlikely to
repeated during Chandra's lifetime.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:46:13.10 -00:06:05.00 IRAS05436-0007 ACIS-I NONE 20.00
05:46:13.10 -00:06:05.00 IRAS05436-0007 ACIS-I NONE 20.00
05:46:13.10 -00:06:05.00 IRAS05436-0007 ACIS-I NONE 20.00
===================================================================================
Proposal Number: 06200153
Proposal Title: The puzzle of X-ray emission from magnetic stars without
convective envelopes
PI: J\"urgen Schmitt
Subject Category: STARS AND WD
Abstract: X-ray emission is ubiquitously found for hot and cool stars in the
HR-diagram. The X-ray emission from hot stars is thought to be related to
radiative wind instabilities, that of cool stars to magnetic activity, produced
by the dynamo mechanism in the outer convection zones. B/A-tye stars without
winds and outer convection zones should then be devoid of X-ray emission, yet one
does find some percentage of those stars as X-ray emitters. This X-ray emission
is conventionally attributed to low-mass companions.We show that the stars
HD66318 and HD215441 with extremely large magnetic fields (> 10kG) are X-ray
sources and suspect that all B/A-type stars with sufficiently strong field are
X-ray emitters. We thus propose to carry out a survey of B/A-type with very
strong measured magnetic fields.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
02:04:29.40 -29:17:48.50 HD 12767 ACIS-S NONE 3.00
02:26:00.30 -15:20:28.50 HD 15144 ACIS-S NONE 3.00
16:01:58.90 -37:32:03.70 HD 143473 ACIS-S NONE 15.00
16:06:06.40 -23:36:22.70 HD 144334 ACIS-S NONE 3.00
16:14:53.40 -25:28:37.10 HD 146001 ACIS-S NONE 3.00
16:20:05.50 -20:03:23.00 HD 147010 ACIS-S NONE 15.00
19:34:43.90 +43:56:45.10 HD 184905 ACIS-S NONE 15.00
21:52:01.00 +55:47:48.30 HD 208095 ACIS-S NONE 15.00
22:44:07.50 +55:35:21.20 HD 215441 ACIS-S NONE 20.00
23:02:43.90 +55:14:11.00 HD 217833 ACIS-S NONE 15.00
===================================================================================
Proposal Number: 06200158
Proposal Title: The location and spatial structure of the X-ray emitting plasma
in the magnetically confined environment of beta Cep
PI: Coralie Neiner
Subject Category: STARS AND WD
Abstract: A magnetic field has recently been discovered for the first time in two
Be stars, and a magnetically-confined wind shock (MCWS) model has been proposed
to explain the rotational modulation observed in the UV resonance lines sensitive
to the wind and several other observables. We propose to observe the slowly
rotating magnetic Be star beta Cep, using two phase-constrained Chandra LETG
observations to test the MCWS model for the X-ray emission of magnetic Be stars
and constrain the location and radial velocity of the X-ray emitting plasma
around the star.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
21:28:39.60 +70:33:38.50 beta Cep HRC-S LETG 140.00
===================================================================================
Proposal Number: 06200164
Proposal Title: The issue of coronal abundances: observation of two active stars
with well determined photospheric abundances
PI: Jorge Sanz-Forcada
Subject Category: STARS AND WD
Abstract: The long-debated issue of the coronal abundances in active stars has
not yet arrived to conclusive results, in large part because for most of the
stars for which coronal abundances have been determined, no published
photospheric abundances are available. This is specially true for the most active
stars, in which large rotational velocity complicates the measurement of
photospheric abundances. We propose to determine the coronal abundances of two
active stars with low projected rotational velocities, for which we have
determined accurate photospheric abundances.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
01:16:36.40 -02:30:01.30 AY Cet HRC-S LETG 43.00
===================================================================================
Proposal Number: 06200204
Proposal Title: A Chandra HETGS Survey of O-Stars
PI: Wayne Waldron
Subject Category: STARS AND WD
Abstract: We are requesting HETGS observations of 6 normal O-stars to further
explore the characteristics and the origin of the remarkably detailed X-ray line
spectra that has been revealed by Chandra. These new targets have been carefully
selected on the basis of their normal optical and UV spectra, instead of their
X-ray brightness or peculiarity. Along with archival HETGS spectra, this
collection will provide complete coverage of the O-star domain in the H-R
diagram. The spectra from this unbiased sample will be assembled in a
comprehensive X-ray atlas, which will be used to search for morphological trends
in the emission lines as a function of stellar parameters. These trends will
guide the development of quantitative models to explain the behavior of the X-ray
emission lines of O-type stars.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
06:40:58.70 +09:53:44.70 15 Mon ACIS-S HETG 108.00
10:43:57.50 -59:32:51.00 HD93129AB ACIS-S HETG 145.00
10:44:45.00 -59:33:54.70 HD93250 ACIS-S HETG 24.00
10:44:45.00 -59:33:54.70 HD93250 ACIS-S HETG 170.00
18:03:52.40 -24:21:38.60 9 Sgr ACIS-S HETG 147.00
===================================================================================
Proposal Number: 06200255
Proposal Title: Simultaneous X-ray and Radio Monitoring of YSO Activity in the
Coronet Cluster
PI: Jan Forbrich
Subject Category: STARS AND WD
Abstract: As of now, X-ray and radio continuum flares from young stellar objects
have mainly been studied as separate phenomena. Thus we propose simultaneous
X-ray and VLA high-resolution radio monitoring of a collection of promising YSOs
in the Coronet cluster. Within this cluster, we will be able to study at least
five class I protostars with a minimum total number of 10 sources to be
simultaneously monitored. Additional near-infrared observations, if possible
within the Chandra/VLA timeframe, will further increase the value of this
multi-wavelength monitoring campaign.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:01:45.00 -36:58:09.00 Coronet Cluster ACIS-I NONE 15.00
19:01:45.00 -36:58:09.00 Coronet Cluster ACIS-I NONE 15.00
19:01:45.00 -36:58:09.00 Coronet Cluster ACIS-I NONE 15.00
19:01:45.00 -36:58:09.00 Coronet Cluster ACIS-I NONE 15.00
19:01:45.00 -36:58:09.00 Coronet Cluster ACIS-I NONE 15.00
===================================================================================
Proposal Number: 06200274
Proposal Title: h and Chi Per: The Loudest Sources?
PI: NANCY EVANS
Subject Category: STARS AND WD
Abstract: We propose Chandra observations of the young (14 Myr) stars in the
distinctive double cluster h and Chi Per. We have found X-ray sources among the
pre-main sequence stars in a ROSAT PSPC image which are more luminous than
sources in the younger Orion Nebula cluster. This may imply a higher level of
stellar activity than previously measured. High resolution Chandra images will be
used to identify the stellar counterparts of X-ray sources, search for a bridge
between the clusters, determine the X-ray luminosity distribution, investigate
whether the very strong sources are single sources, and study the development of
the hot component of the spectra. Optical followup is planned to examine the
spectra for emission lines, multiplicity, and rotation.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
02:19:02.20 +57:07:12.00 h Per ACIS-I NONE 40.00
02:20:32.00 +57:03:28.00 Inter-Per ACIS-I NONE 10.00
===================================================================================
Proposal Number: 06200294
Proposal Title: The X-ray Spectrum of a Planetary Nebula at High Resolution
PI: Joel Kastner
Subject Category: STARS AND WD
Abstract: Planetary nebulae (PNs) provide unique insights into a wide range of
astrophysical phenomena. X-ray imaging of PNs by CXO has now broken open the
study of very high temperature gas in these objects. To make further progress, we
require detailed information concerning gas temperature and composition as a
function of position within X-ray emitting PN "hot bubbles." Such information can
be obtained only from observations combining high spectral and spatial
resolution. We propose a 300 ks LETG/ACIS-S exposure of BD+303639, a particularly
X-ray-bright PN. Such a deep, high spectral resolution observation of a PN has
yet to be attempted. The proposed observation thus represents a potential
breakthrough in our understanding of the origin and evolution of PNs.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:34:45.20 +30:30:58.90 BD +303639 ACIS-S LETG 130.00
19:34:45.20 +30:30:58.90 BD +303639 ACIS-S LETG 170.00
===================================================================================
Proposal Number: 06200332
Proposal Title: A Rich Population of Massive Young Stars in the Cluster
Westerlund 1
PI: Stephen Skinner
Subject Category: STARS AND WD
Abstract: The compact heavily-reddened cluster Westerlund 1 in the southern Milky
Way is spectacularly revealed in near-infrared images. The cluster is very young
(age 3 - 8 My) and is dominated by a diverse population of high-mass stars that
are undergoing rapid mass-loss and have already evolved off the main sequence.
These include red and blue supergiants, a luminous blue variable candidate, and
11 recently-discovered Wolf-Rayet (WR) stars. In addition, nonthermal radio
emission indicative of high-energy processes is present. We propose to obtain a
sensitive Chandra ACIS observation of Westerlund 1 to identify X-ray emitting
cluster members, test the validity of wind-shock theories of X-ray emission in
massive stars, and search for diffuse X-rays from hot gas in the cluster wind.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
16:47:05.40 -45:50:36.70 Westerlund1 ACIS-S NONE 60.00
===================================================================================
Proposal Number: 06200370
Proposal Title: Resolving the Puzzle of Hybrid Star Coronal X-rays
PI: THOMAS AYRES
Subject Category: STARS AND WD
Abstract: We propose 20 ks HRC-I pointings to detect 3 members of the so-called
"hybrid star" class, and 50 ks to confirm a previous HRC-I detection of the
archetype noncoronal giant Arcturus. Coronal activity, mirrored in X-ray
emission, is important to the Sun-Earth connection, the fate of primitive
planetary atmospheres, and a broad reaching set of magnetic phenomena in diverse
cosmic environments. Our program will explore the limits of X-ray activity across
the "coronal dividing line," focussing on targets for which ROSAT-era detections
have been challenged recently. Assessing the true levels of coronal activity in
these objects has important implications for understanding the initiation of
chromospheric winds in red giants, a key phenomenon whose origins remain
elusive.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:56:36.40 +51:29:20.00 HD 164058 HRC-I NONE 20.00
21:31:33.50 -05:34:16.20 HD 204867 HRC-I NONE 20.00
22:05:47.00 -00:19:11.50 HD 209750 HRC-I NONE 20.00
===================================================================================
Proposal Number: 06200432
Proposal Title: Untangling the Accretion Spots on Classical T Tauri Stars
PI: Andisheh Mahdavi
Subject Category: STARS AND WD
Abstract: Many Classical T Tauri Stars (CTTS) possess accretion spots where
magnetically funneled material crashes onto the photosphere from the surrounding
disk. As the star rotates, so does the spot, yielding a clear periodicity in the
optical light curves. The same regular variation should be present in the X-ray
emission despite complicating factors such as flares; however, this effect has
never been conclusively proved. We propose to separate the X-ray spectrum of the
chromosphere from that of the accretion spot by observing GK and GI Tau at four
different phases in their rotation. By comparing the X-ray spectra at minimum and
maximum occultation, we can isolate the accretion process from other X-ray
activity in these stars.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
04:33:34.50 +24:21:09.00 GK Tau ACIS-S NONE 15.00
04:33:34.50 +24:21:09.00 GK Tau ACIS-S NONE 15.00
04:33:34.50 +24:21:09.00 GK Tau ACIS-S NONE 15.00
04:33:34.50 +24:21:09.00 GK Tau ACIS-S NONE 15.00
===================================================================================
Proposal Number: 06200506
Proposal Title: Doppler Imaging of WR140's Collisionless Shocks at Apastron
PI: Andrew Pollock
Subject Category: STARS AND WD
Abstract: The Chandra observation of WR140 at its X-ray brightest just before the
periastron passage of 2001-02-05 revealed direct evidence of a plasma out of
equilibrium after collisionless shock heating. A similar observation 4 years
later at apastron will sample the opposite extreme of physical conditions
encountered by the shocks. With densities more than 200 times lower expected and
cooler ions flowing into the shock, Compton relaxation and ionization evolution
should proceed more slowly, so that not only will the line shapes map the flow of
gas in the new geometry but should be much cooler. This may explain the hitherto
unexplained phase variability of the Fe lines detected by ASCA.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
20:20:28.00 +43:51:16.30 WR 140 ACIS-S HETG 150.00
===================================================================================
Proposal Number: 06200517
Proposal Title: MAGNETIC ACTIVITY IN YOUNG STARS: THE WEAK-LINED T TAURI STAR
HDE 245059
PI: MARC AUDARD
Subject Category: STARS AND WD
Abstract: We propose to study the bright weak-lined T Tauri star, HDE 245059 Tau,
with Chandra HETGS. The young star displays strong X-ray luminosity (log Lx ~ 32
erg/s), but a surprisingly cooler (6-8 MK) plasma than in several X-ray bright
weak-lined T Tauri stars. Its soft X-ray spectrum is reminiscent of that of TW
Hya, a classical T Tauri star whose grating X-ray spectrum revealed a cool (3 MK)
plasma with high densities (log ne ~ 13 cm-3) probably due to accretion, in
contrast with other classical T Tauri stars with dominant very hot (T ~ 30 MK)
plasmas. We will investigate the X-ray properties of HDE 245059, and in
particular determine electron densities from several He-like triplets. We will
put our results in the context of the evolution with time of magnetic activity in
stars.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:34:34.90 +10:07:06.20 HDE 245059 ACIS-S HETG 100.00
===================================================================================
Proposal Number: 06200570
Proposal Title: A MINI-SURVEY OF MAGNETIC ACTIVITY IN L AND T BROWN DWARFS
PI: MARC AUDARD
Subject Category: STARS AND WD
Abstract: We propose a mini-survey of magnetic activity in L and T brown dwarfs
in the X-rays with Chandra and in the radio with the VLA and ATCA. Our
mini-sample includes two L and one T brown dwarfs. Our Chandra exposures will
reach X-ray luminosities down to log Lx/Lbol = -4. Our targets are close, old (~1
Gyr) brown dwarfs, whose Halpha emission should not be contaminated by any
accretion mechanism as in young brown dwarfs. With this Chandra proposal, we aim
at detecting X-rays during quiescence or flares. Coordination with the VLA and
ATCA radio telescopes is proposed as well. Even if undetected, upper limits will
provide strong constraints for models of magnetic activity at the very bottom of
the main sequence.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
13:05:40.00 -25:41:05.90 Kelu-1 ACIS-S NONE 24.00
===================================================================================
Proposal Number: 06200643
Proposal Title: CORONAL FLARING AND THE NEUPERT EFFECT ON THE ACTIVE BINARY
SIGMA GEM
PI: Alexander Brown
Subject Category: STARS AND WD
Abstract: We propose coordinated HETGS, STIS, and radio (VLA,VLBA,MERLIN,Arecibo)
observations of the RS CVn binary Sigma Gem to observe flaring and quiescent
coronal emission, test whether the flares show the Neupert effect expected from
chomospheric evaporation models, and determine the flare energy budget. HETGS
will measure changes in the coronal emission measure, temperature, density, and
elemental abundances. Radio continuum emission will provide a proxy for the high
energy particles accelerated during magnetic reconnection. STIS Fe XXI spectra
will measure the flare dynamical energy losses. Sigma Gem is an ideal target
because it is one of the brightest RS CVns in X-rays, single-lined, and flares
40% of the time. Its long duration flares increase the likelihood of tracking
flare evolution.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
07:43:18.70 +28:52:59.70 SIGMA GEM ACIS-S HETG 130.00
===================================================================================
Proposal Number: 06200645
Proposal Title: The Production of X-ray Emission in Classical T Tauri Stars
PI: Gregory Herczeg
Subject Category: STARS AND WD
Abstract: We propose to obtain a 150 ks HETG spectrum of the Classical T Tauri
Star (CTTS) V4046 Sgr. The unknown source of strong X-ray emission remains a
glaring weakness in our understanding of energetics around young stars. An HETG
observation of the CTTS TW Hya suggested that the physical properties of the hot
gas around accreting stars may be different from solar-like coronae. This
difference hints that accretion may produce most of the X-rays from CTTSs.
However, this tentative conclusion is based on observations of only one CTTS,
that may not be representative of its class. We seek to verify this conclusion,
and to obtain a better understanding of the temperature, electron density, and
abundances of hot gas around CTTSs, by obtaining a high S/N HETG spectrum of an
X-ray bright CTTS.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:14:10.50 -32:47:34.50 V4046 Sgr ACIS-S HETG 150.00
===================================================================================
Proposal Number: 06200661
Proposal Title: The power within the PacMan Nebula: Triggered Star Formation in
NGC 281
PI: Scott Wolk
Subject Category: STARS AND WD
Abstract: We propose deep a moderately deep (100ks) ACIS-I observation of the
unique, edge-on, star forming region NGC 281. The proposed pointing will include
3 separate but related sites of star formation within 4 pc of eachother. The
oldest region includes several 3.5Myr old O stars while the youngest regions are
still active. We will determine whether the sites are part of a single,
continuous cluster, or whether they are separate clusters created by distinct
episodes of star formation - as predicted by the clump implosion scenario. The
edge-on aspect of the region allows us to study the diffuse plasma in the region
to understand the role of X-ray ionization along the HII region/molecular cloud
interface. We will also directly observe the thermal evolution of the hot
corona.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
00:52:27.10 +56:33:54.00 NGC 281 ACIS-I NONE 100.00
===================================================================================
Proposal Number: 06200742
Proposal Title: How Do T Tauri Stars Generate X-rays?
PI: David Weintraub
Subject Category: STARS AND WD
Abstract: X-ray emission is an indicator of the presence of powerful magnetic
fields in the immediate environments of young stars. In turn, the magnetic
reconnection events that generate the X-rays require a stimulus. If PMS stars are
like MS stars, fast rotation generates coronal X-rays; however, strong evidence
exists that X-rays from classical T Tauri stars (TTS) may be generated through
accretion streams. We request 120 ksec to survey six binary systems (20 ksec per
binary), each containing one classical TTS and one weak-lined (diskless) TTS.
Using subpixel event repositioning techniques, as neccessary, we will determine
the X-ray flux rates and spectral energy distributions for these TTS and thereby
provide important constraints on theories for X-ray generation from PMS stars.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
04:31:57.70 +18:21:36.90 V710 Tau ACIS-S NONE 10.00
04:31:57.70 +18:21:36.90 V710 Tau ACIS-S NONE 10.00
===================================================================================
Proposal Number: 06200872
Proposal Title: Multi-Wavelength Signatures of Magnetic Activity in the
Star-Forming Region around LkHa101
PI: Scott Wolk
Subject Category: STARS AND WD
Abstract: Among several classes of active stars and solar flares, a tight
relation is found between X-ray and radio luminosities. This relation, which
implies an intimate physical connection, has been subject to coordinated radio
and X-ray studies for particular active binaries and dMe stars, but never among
one of the most active classes of stars, pre-main sequence stars. Here, we
propose a pair of 40ks coordinated VLA/ACIS-I observations of the nearby young
cluster around LkHa101. We will examine the X-ray radio connection simultaneously
for several scores of stars. The data will tighten the relation of the quiescent
emission and study the causal relation of radio and X-ray flares for young stars
with and without disks.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
04:30:14.40 +35:16:22.20 LkHa101 cluster ACIS-I NONE 40.00
04:30:14.40 +35:16:22.20 LkHa101 cluster ACIS-I NONE 40.00
===================================================================================
Proposal Number: 06200882
Proposal Title: Planet-Induced Activity Enhancements in the HD 179949 System
PI: Steven Saar
Subject Category: STARS AND WD
Abstract: Many exoplanets are gas giants extremely close (<0.1 AU) to their
parent stars, suggesting the possibility of exotic interactions. Recently, weakly
enhanced Ca II HK emission was found in the HD 179949 system, phased to the
orbital (~3 d) and not to the stellar rotation period (~8 d). Theory suggests
this enhancement is due to a magnetic interaction (MI) between the star and
planet. Since the resulting heating should be largest in X-rays, we propose to
study the system with Chandra to further characterize the MI. We will use HST to
study the MI effect on the planet's ablating atmosphere by observing Doppler
shifted H~I around quadrature. These datasets will enable us to test interaction
theories, and estimate exoplanetary magnetic fields, mass loss and stellar wind
properties.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:15:33.20 -24:10:45.70 HD 179949 ACIS-S NONE 150.00
***********************************************************************************
WD BINARIES AND CV
--------------------------------------------------
===================================================================================
Proposal Number: 06300119
Proposal Title: Chandra Soft X-ray Spectroscopy of QS Tel
PI: Christopher Mauche
Subject Category: WD BINARIES AND CV
Abstract: We propose to observe one of the brightest polars, QS Tel, with the
Chandra LETGS to measure the spectral energy distribution of the accretion-heated
photosphere, the depths of the absorption edges, and the depths and widths of the
discrete absorption features. These data will be used to constrain the run of
temperature with optical depth in the photosphere and hence determine the
relative importance of irradiation versus "deep heating" to the energetics of the
photosphere. [This proposal was accepted for TOO observations during Cycle 5, but
QS Tel has entered a low state, so the proposal is being resubmitted to cover the
small chance that the source does not become bright again before the end of the
current cycle.]
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:38:35.70 -46:12:56.50 QS Tel HRC-S LETG 84.00
===================================================================================
Proposal Number: 06300120
Proposal Title: Coordinated Multiwavelength Observations of AE Aqr
PI: Christopher Mauche
Subject Category: WD BINARIES AND CV
Abstract: We propose to conduct an ambitious campaign of coordinated
multiwavelength observations of the former supersoft X-ray binary and current
magnetic propeller AE Aqr. Recent XMM observations have thrown into doubt the
source of the X-ray emission and the heating of the optical and UV emission line
regions. We propose to observe AE Aqr for 2 binary orbits with the Chandra HETG
to measure the radial velocity variations of the X-ray emission lines and
constrain the plasma density. We also propose to obtain 6 orbits of HST
high-resolution time-tagged UV spectroscopy and 12 hrs of VLA time, to which we
will add mm through gamma-ray data. These data will provide the most complete
picture of the locations, mass motions, energetics, and interrelationships of the
various emission regions.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
20:40:09.20 -00:52:15.10 AE Aqr ACIS-S HETG 78.00
===================================================================================
Proposal Number: 06300176
Proposal Title: Chandra HETG Spectroscopy of the VY Sculptoris Star TT Ari
PI: Christopher Mauche
Subject Category: WD BINARIES AND CV
Abstract: Existing data indicate that high mass-accretion rate (Mdot) nonmagnetic
cataclysmic variables (nmCVs) like novalike variables, VY Scl stars, and dwarf
novae in outburst have X-ray spectra that are far more interesting (have brighter
lines arising from a broader range of ionization stages) than those of low-Mdot
nmCVs like dwarf novae in quiescence. However, most of the nmCVs already targeted
by Chandra and XMM are dwarf novae in quiescence. We propose to remedy the
imbalance between low-Mdot and high-Mdot nmCVs by observing the brightest VY Scl
star, TT Ari, with the Chandra HETG. With this spectrum we will constrain the
emission measure distribution, line velocity widths, abundances, density, and
geometry of the X-ray-emitting plasma, thereby constraining the boundary layer
parameters.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
02:06:53.10 +15:17:43.00 TT Ari ACIS-S HETG 100.00
===================================================================================
Proposal Number: 06300279
Proposal Title: Plasma and Kinematic Diagnoses of the Post-Shock Cooling Plasma
in the Intermediate Polar YY Draconis
PI: Koji Mukai
Subject Category: WD BINARIES AND CV
Abstract: We propose a 100 ksec Chandra HETG/ACIS-S observation of the
intermediate polar, YY Dra. The existing ASCA data suggest that this is one of
the few magnetic CVs with a cooling flow-like X-ray spectrum. The double humped
X-ray spin modulation of YY Dra implies that we view both poles during a spin
cycle. The combination of these two factors makes YY Dra an ideal target for an
HETG observation. We intend to analyze the results both within the context of
existing multi-wavelength data on YY Dra and of existing Chandra data of magnetic
and non-magnetic CVs. The unique geometry and X-ray brightness of YY Dra should
provide phase-averaged and phase-resolved spectra that will clarify our
understanding of accretion in the presence of magnetic fields.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
11:43:38.30 +71:41:20.40 YY Draconis ACIS-S HETG 100.00
===================================================================================
Proposal Number: 06300481
Proposal Title: Sensitive X-ray surveys of the nearby globular clusters NGC
6544, NGC 6838 (M71), and NGC 6656 (M22)
PI: Ronald Elsner
Subject Category: WD BINARIES AND CV
Abstract: We propose moderately deep ACIS-S surveys of the nearby globular
clusters NGC 6544, NGC 6838 (M71), and NGC 6656 (M22). We request two orbits of
HST/ACS time to study the crowded core of NGC 6544. Existing archival HST and
ground-based optical data suffice for M22 and M71. These observations will
provide high-sensitivity surveys of the quiescent low-mass x-ray binary,
cataclysmic variable, milli-second pulsar, and chromospherically active binary
populations of these clusters, important inputs to models of globular cluster
evolution. We will detect the newly discovered milli-second pulsars in NGC 6544
and M71 if they are as bright as the faint milli-second pulsars in 47 Tuc. We
will confirm or exclude the identification of an apparent dwarf nova with an
x-ray source in the core of M22.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:53:46.10 +18:46:42.20 NGC 6838 (M71) ACIS-S NONE 53.00
===================================================================================
Proposal Number: 06300541
Proposal Title: A Uniform Study of Globular Cluster X-ray Sources: the Keys to
Cluster Dynamical Evolution
PI: Walter Lewin
Subject Category: WD BINARIES AND CV
Abstract: We propose to extend our ongoing studies of the dynamical evolution of
globular clusters by observing their populations of low-luminosity X-ray sources.
Many of these sources are binary systems (or have evolved from them) and hold the
key to the cluster's dynamical evolution. We propose observations of a variety of
clusters with widely different physical properties such as central concentration,
cluster size and mass, which are all key ingredients in the formation and
evolution of binaries. To make this study as uniform as possible, the clusters
will be observed to the same limiting luminosity. Joint observations with HST
will allow for definitive source identification.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
16:41:41.50 +36:27:37.00 NGC 6205 ACIS-S NONE 59.00
18:07:20.60 -24:59:51.00 NGC 6544 ACIS-S NONE 17.00
18:36:24.20 -23:54:12.00 NGC 6656 ACIS-S NONE 16.00
===================================================================================
Proposal Number: 06300849
Proposal Title: R Aquarii X-ray Jets: a synoptic study
PI: Edwin Kellogg
Subject Category: WD BINARIES AND CV
Abstract: Chandra showed the symbiotic star R Aqr in 2000.69 and 2003.99 has
remarkable evolution in its x-ray jets. The NE jet has moved out with a
tangential velocity of 600 km/s, much higher than any previously known motion in
this system. The SW outer jet has apparently faded, while an inner SW jet is
emerging from the central source. We propose three observations next year, one at
minimum light of the mira donor star, another at maximum light, and a third
coincident with our FUSE 5 observation. This will allow modeling shock processes
in the jets as they interact with the surrounding hourglass nebulae and also tell
us whether the mira pulsations accompany x-ray emission changes from the central
star, elucidating mass transfer and accretion disk or winds surrounding the
compact star.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
23:43:49.60 -15:17:03.70 R Aqr ACIS-S NONE 70.00
===================================================================================
Proposal Number: 06300907
Proposal Title: X-Ray Observation of a Transient Symbiotic-Star jet
PI: Jennifer Sokoloski
Subject Category: WD BINARIES AND CV
Abstract: Astrophysical jets are ubiquitous in the universe, yet the collimation
and acceleration mechanisms for these outflows are unclear. Accretion disks,
however, are likely to play a key role. White dwarfs have possibly the
best-understood disks, so symbiotic stars (SS), which are a recently identified
class of jet-producing objects, are promising targets. The two SS x-ray jets that
have been discovered to date (R Aqr and more recently, CH Cyg) both show x-ray
structure even more extended than their radio jets. To further study the X-ray
properties of SS jets, most of which are transient, plus investigate changes in
the central object when a jet in ejected, we propose a Chandra TOO observation of
the next SS jet that is discovered. This proposal was accepted in AO5, but not
triggered.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
Transient Symbiotic- ACIS-S NONE 100.00
===================================================================================
Proposal Number: 06300908
Proposal Title: Testing Accretion Scenarios at the Eddington Limit
PI: Vadim Burwitz
Subject Category: WD BINARIES AND CV
Abstract: We propose to obtain five 25 ksec HRC-S+LETG observations of the
transient supersoft X-ray binary RX J0513.3-6951 distributed over a complete ~40
day long X-ray on state. This data will for the first time provide a spectral
resolution adequate for a detailed LTE and non-LTE modelling of the hot stellar
atmosphere, and will unequivocally reveal the nature of the accreting compact
object. The expected spectral changes during the exponential decline phase of the
soft X-ray flux will allow us to accurately determine the temporal variation of
the radius and effective temperature of the stellar photosphere. The observations
are a viable test of different scenarios proposed for the response of compact
binaries to accretion rates close to the Eddington critical limit and their
long-term evolution.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:13:50.80 -69:51:47.00 RXJ0513.9-6951 HRC-S LETG 25.00
05:13:50.80 -69:51:47.00 RXJ0513.9-6951 HRC-S LETG 25.00
05:13:50.80 -69:51:47.00 RXJ0513.9-6951 HRC-S LETG 25.00
05:13:50.80 -69:51:47.00 RXJ0513.9-6951 HRC-S LETG 25.00
05:13:50.80 -69:51:47.00 RXJ0513.9-6951 HRC-S LETG 25.00
===================================================================================
Proposal Number: 06301031
Proposal Title: Supersoft X-rays from the VY Scl type stars
PI: Peter Predehl
Subject Category: WD BINARIES AND CV
Abstract: We propose a GTO/TOO observe the supersoft X-rays from the VY Scl stars
during their optical low/X-ray bright state.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
Super Soft Source ACIS-S NONE 10.00
Super Soft Source ACIS-S NONE 75.00
***********************************************************************************
BH AND NS BINARIES
--------------------------------------------------
===================================================================================
Proposal Number: 06400015
Proposal Title: The Energy Distribution of GS1354-64
PI: Stephen Murray
Subject Category: BH AND NS BINARIES
Abstract: In 1967 the X-ray nova Cen X-2 was observed in a succession of several
sounding rocket flights and reached an astounding maximum observed intensity of
13 Crab. The faint (0.12 Crab) 1987 X-ray nova GS1354-64 and its optical
counterpart (BW Cir) appear to be one and the same as Cen X-2. If this
association is true, then scaling from A0620-00, we would expect the X-ray novae
to lie at a distance of ~1-2 kpc and be relatively bright in quiescence. These
observations would therefore provide a high quality spectrum of a BHXN in
quiescence. We expect the mass function to be determined soon, and therefore the
quiescent luminosity will provide additional evidence for the faintness of BHs
relative to NSs.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
13:58:09.70 -64:44:05.20 GS1354-64 / BW Cir ACIS-S NONE 40.00
===================================================================================
Proposal Number: 06400097
Proposal Title: Faint quiescent neutron star soft X-ray transients
PI: Peter Jonker
Subject Category: BH AND NS BINARIES
Abstract: We propose to obtain a 20 ksec ACIS-S observation of 1H1715-321 and a
25 ksec of 1H1905+000. Because of non--detections during very short previous
Chandra observations, both sources have to have a low quiescent luminosity. They
also have a low N_H and a well-known source distance. Finally, the source
position is known accurately enough to circumvent source confusion. These
observations will reduce the gap in the derived quiescent luminosities between
neutron star and BH SXTs which is used as being evidence for a BH event horizon.
Furthermore, a low-luminosity neutron star means a relatively cold, and therefore
likely, massive neutron star. The masses of neutron stars provide important
constraints on the EoS of ultra-dense matter. This is one of the ultimate goals
of neutron star studies.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:18:47.40 -32:10:40.00 1H 1715-321 ACIS-S NONE 20.00
19:08:27.00 +00:10:08.00 1H 1905+000 ACIS-S NONE 25.00
===================================================================================
Proposal Number: 06400115
Proposal Title: Following a black hole candidate soft X-ray transient returning
to quiescence
PI: Peter Jonker
Subject Category: BH AND NS BINARIES
Abstract: We propose to obtain 5 observations of a BH SXT as it returns to
quiescence, for each of the observations we also request a nearly simultaneous
VLA radio observation. Using these observations we can test whether the empirical
relation between the radio and X-ray flux found over 4 decades in X-ray flux in
low/hard state BH SXTs extends to X-ray flux levels a factor of 600 lower. If
this relation holds this may explain the fact that the BH SXTs in quiescence are
fainter in X-rays than NS SXTs without the need of a BH event-horizon.
Furthermore, we will obtain high quality spectra of a BH SXT at scarcely studied
luminosity intervals, allowing us to determine whether the evolution of the
powerlaw spectral index is smooth or abrupt.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
TOO ACIS-S HETG 5.00
TOO ACIS-S HETG 5.00
TOO ACIS-S NONE 10.00
TOO ACIS-S NONE 20.00
TOO ACIS-S NONE 40.00
===================================================================================
Proposal Number: 06400127
Proposal Title: Precise astrometry of the X-ray sources 4U1700+24 and 4U1954+319
PI: Nicola Masetti
Subject Category: BH AND NS BINARIES
Abstract: We propose to observe two peculiar galactic X-ray sources, 4U1700+24
and 4U1954+319, which are suspected to have an M-type giant star as optical
counterpart, in order to get an high-precision astrometric position for both of
them. This would definitely settle the issue of the identification of their true
optical counterpart, which is important given that X-ray binary systems with a
red giant as confirmed companion are extremely rare. Two very short (`snapshot')
observations with Chandra will secure this result.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:06:34.60 +23:58:14.00 4U 1700+24 HRC-I NONE 1.00
19:55:42.10 +32:05:56.50 4U 1954+319 HRC-I NONE 1.00
===================================================================================
Proposal Number: 06400159
Proposal Title: X-Ray Jets in Microquasars
PI: Stephane Corbel
Subject Category: BH AND NS BINARIES
Abstract: We propose Target of Opportunity (ToO) observations for detailed
studies of X-ray jets from microquasars. We describe our discovery of radio/X-ray
jets in two microquasars and why X-ray jets are probably much more common than
previously thought and also why it offers an exciting new way to probe the
physics of the jets. The proposed ToO observations are optimized to discover and
study (flux evolution, morphology, SED, proper motion, ...) new X-ray jets from
microquasars, based on their detection as radio lobes. This will have
implications not only for the study of jets from Galactic X-ray binaries, but
also for our understanding of relativistic jets from active galactic nuclei
(AGN).
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
X-ray Jets ACIS-S NONE 30.00
X-ray Jets ACIS-S NONE 50.00
X-ray Jets ACIS-S NONE 60.00
===================================================================================
Proposal Number: 06400177
Proposal Title: Relativistic Effects and Outflows in a Black Hole Transient
PI: Jon Miller
Subject Category: BH AND NS BINARIES
Abstract: Our Chandra observations of Galactic BH systems have begun to reveal
relativistic effects and important connections between stellar-mass black holes
and the super-massive black holes powering Seyferts, including relativistic iron
emission lines and outflowing warm absorber geometries. We propose to observe a
Galactic BH transient in outburst for 200 ksec, in 4 obs. of 50 ksec, using the
HETGS. These observations will probe relativistic effects near black holes, the
nature and evolution of disk winds and warm absorbers, the emerging disk-jet
connection in BH systems, and the dependence of the accretion flow geometry on
mass accretion rate and other parameters. These observations will be supported by
a global multi-wavelength (radio, IR, optical, X-ray, gamma-ray) program.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
BH Transient ACIS-S HETG 50.00
BH Transient ACIS-S HETG 50.00
BH Transient ACIS-S HETG 50.00
BH Transient ACIS-S HETG 50.00
===================================================================================
Proposal Number: 06400219
Proposal Title: Quiescent X-ray counterparts of Globular Cluster transients
PI: Rudy Wijnands
Subject Category: BH AND NS BINARIES
Abstract: We propose to continue our successful program on the quiescent X-ray
counterparts of known bright neutron-star X-ray transients in Galactic globular
clusters. The relatively well-known distances to those clusters make them
excellent targets to study the properties of their quiescent neutron-star
systems. Previous Chandra and ROSAT/HRI observations of the clusters caught the
transient systems in outburst, providing (sub-)arcsecond positions for those
transients and allowing immediate X-ray identification of their quiescence
counterparts. We will also obtain excellent data on the low-luminosity X-ray
source population of the target globular clusters which we will use in our
ongoing efforts to determine the nature of these sources.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:35:47.30 -30:28:55.00 Terzan 1 ACIS-S NONE 20.00
===================================================================================
Proposal Number: 06400222
Proposal Title: Quasi-persistent neutron-star X-ray binaries in quiescence
PI: Rudy Wijnands
Subject Category: BH AND NS BINARIES
Abstract: We propose to observe the next (quasi-)persistent neutron-star low-mass
X-ray binary that turns off and becomes quiescent. This will provide an excellent
opportunity to study the effects of prolonged accretion on the neutron-star
properties (i.e., crust and core) and the quiescent properties of low-mass X-ray
binaries. Two follow-up observations taken several months later will provide
important information about the time evolution of the quiescent properties. In
particular, if indeed the quiescent X-rays are emitted by the crust, we will be
able to study its evolution in time, thus setting strong constraints on the crust
cooling models and the exact structure of the crust.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
Quiescent source ACIS-S NONE 30.00
Quiescent source ACIS-S NONE 30.00
Quiescent source ACIS-S NONE 30.00
===================================================================================
Proposal Number: 06400229
Proposal Title: Cooling curves of accretion-heated neutron stars
PI: Rudy Wijnands
Subject Category: BH AND NS BINARIES
Abstract: We propose to observe the quasi-persistent neutron-star low-mass X-ray
transients KS 1731-260 and MXB 1659-29 once in their quiescent state during cycle
6 of Chandra. These observations will strongly constrain the time evolution
behavior of the quiescent properties of these systems. In the context of the
cooling neutron-star model for the quiescent emission in neutron star X-ray
transients, our proposed observations will follow the cooling curves of the crust
and core of the neutron stars in those systems. Our previous quiescent
observations of both systems have already shown that their neutron stars cooled
down rapidly, setting stringent constraints on the structure of the compact
objects.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:02:06.40 -29:56:44.30 MXB 1659-29 ACIS-S NONE 50.00
17:34:13.50 -26:05:18.80 KS 1731-260 ACIS-S NONE 50.00
===================================================================================
Proposal Number: 06400243
Proposal Title: INVESTIGATING NEW INTEGRAL SOURCES WITH CHANDRA
PI: Adamantia Paizis
Subject Category: BH AND NS BINARIES
Abstract: We propose to trigger a maximum of 2 Chandra slow TOO observations on
new sources discovered by the INTEGRAL Observatory. We ask for 20 ksec per
observation, using HETGS. The scientific aim is to determine the source position
with subarcsecond accuracy that only Chandra can provide, enabling
multiwavelength follow-up observations, and to obtain the high resolution HETG
X-Ray spectrum, essential to determine the nature of the new source. This is a
re-submission of an already (partially) accepted, not yet triggered, AO5 TOO
Chandra proposal.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
New INTEGRAL source ACIS-S HETG 20.00
===================================================================================
Proposal Number: 06400328
Proposal Title: Localization of INTEGRAL-Selected Sources in the Norma Region
PI: John Tomsick
Subject Category: BH AND NS BINARIES
Abstract: The INTEGRAL satellite is discovering a large number of new high energy
sources in the Galactic plane. In most cases, the few arcminute INTEGRAL
positions do not allow for identification of the "IGR" sources at other
wavelengths, leaving their nature unclear. We propose to use Chandra to localize
ten of the IGR sources found in the Norma region of the Galaxy, allowing us to
study these sources at optical and IR wavelengths to determine if they are part
of a new high energy population. Our group consists of people who have been
actively involved in early IGR source studies and discoveries, and we use our
long INTEGRAL observation of the Norma region to plan the proposed observations.
In addition, we already have an ESO program in place for optical/IR follow-up of
IGR sources.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
16:16:42.00 -49:57:00.00 IGR J16167-4957 ACIS-I NONE 5.00
16:19:30.00 -49:45:00.00 IGR J16195-4945 ACIS-I NONE 5.00
16:20:42.00 -51:28:60.00 IGR J16207-5129 ACIS-I NONE 5.00
17:19:30.00 -41:00:00.00 IGR J17195-4100 ACIS-I NONE 5.00
===================================================================================
Proposal Number: 06400331
Proposal Title: Resolving the Fe Line, Warm Absorber, and Scattering Halo of
GX339-4 with Joint Chandra/RXTE Observations
PI: Michael Nowak
Subject Category: BH AND NS BINARIES
Abstract: We propose a joint Chandra/RXTE observation of GX 339-4 to be performed
as a slow ToO, and during the radio-loud low/hard state of the source. We will
definitively measure the Fe line in this state and resolve it into narrow and
broad components. We will also study the low energy absorption spectra, and
compare our results to previous "intermediate state" spectra of the source. This
will enable us to determine which features are intrinsic to the system, and which
are due to the ISM. We will also study the dust scattering halo in front of the
source. RXTE data will provide simultaneous measurements of the broad line, high
energy continuum and reflection component, and variability information.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:02:49.40 -48:47:22.40 GX 339-4 ACIS-S HETG 60.00
===================================================================================
Proposal Number: 06400334
Proposal Title: X-RAY DIAGNOSTICS OF THE WIND OF HMXB X1908+075: POSSIBLE
PROGENITOR BH-NS SYSTEM
PI: Saul Rappaport
Subject Category: BH AND NS BINARIES
Abstract: The X-ray binary X1908+075 contains an accreting pulsar orbiting in a
dense stellar wind; the column density to the neutron star varies by a factor of
5 from inferior to superior conjunction. An estimate of the mass flux in the wind
suggests that the companion may be a Wolf-Rayet star rather than an ordinary OB
star. If so, this system could be the first known progenitor of a black
hole/neutron star binary, where the neutron star formed first. We propose HETG
observations to characterize the wind in detail through both the low energy
cutoff of the continuum and the emission lines expected to be produced by
photoionization and fluorescence, and to obtain a precise position. The X-ray
spectroscopy and followup IR spectroscopy will yield important clues to the
nature of the companion.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:10:46.00 +07:36:07.00 X1908+375: Low N_H ACIS-S HETG 50.00
19:10:46.00 +07:36:07.00 X1908+375: High N_H ACIS-S HETG 50.00
===================================================================================
Proposal Number: 06400378
Proposal Title: Accretion Disk Mapping using the P Cygni Line Profiles in
Circinus X-1
PI: Norbert Schulz
Subject Category: BH AND NS BINARIES
Abstract: We propose to observe the luminous X-ray binary Circinus~X-1 for 75 ks
in CC-mode at zero orbital phase using the High-Energy Transmission Grating
Spectrometer (HETGS). We will determine the fine structure of P Cygni line
profiles to diagnose the accretion disk. We also apply the method of
reverberation mapping to the variable absorption and emission components. This
work is the continuation of a project that has already involved five previous
very successful observations, including the discovery of the first P Cygni lines
in an X-ray source.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
15:20:41.00 -57:10:00.00 Cir X-1 ACIS-S HETG 75.00
===================================================================================
Proposal Number: 06400405
Proposal Title: Testing and extending the fundamental plane of black hole
activity
PI: Rob Fender
Subject Category: BH AND NS BINARIES
Abstract: The recently-discovered fundamental plane of black hole activity unites
the radio and X-ray luminosities of accreting black holes over nine orders of
magnitude in accretion rate and eight orders of magnitude in black hole mass.
This is telling us something deep about the scale-invariance of the disc-jet
coupling around black holes. We propose to make a deep observation of the
quiescent black hole X-ray binary A0620-00 simultaneously with Chandra and the
VLA to test the fundamental plane in the the (low black hole mass, very low
accretion rate) regime. Detection of A0620-00 will extend the plane two orders of
magnitude beyond its current range, something which is impossible via any other
observation, a key observation for our understanding of the nature of black hole
accretion.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
06:22:44.50 -00:20:45.00 A0620-00 ACIS-S NONE 40.00
===================================================================================
Proposal Number: 06400423
Proposal Title: Discovering X-ray pulsars in the Wing of the Small Magellanic
Cloud
PI: Malcolm Coe
Subject Category: BH AND NS BINARIES
Abstract: The Small Magellanic Cloud (SMC) is exceptionally abundant in X-ray
pulsars. Over 40 have been discovered as part of a highly successful monitoring
programme and, according to reliable estimates, there may be many hundreds more.
In a recent analysis of 5 archive CHANDRA observations, we discovered 3 entirely
new pulsars and determined the positions of two others. We propose a series of 20
observations covering those regions of the SMC Wing where the evidence suggests
that conditions for the formation of pulsars are favourable. This programme can
be anticipated to reveal up to 20 new pulsars. In the process it will provide a
better understanding of high mass star formation rates and of the evolution of
the SMC.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
00:56:10.00 -73:25:15.00 SMCwing 20 ACIS-I NONE 10.00
00:58:20.00 -71:50:27.00 SMCwing 1 ACIS-I NONE 10.00
00:59:59.00 -73:18:34.00 SMCwing 19 ACIS-I NONE 10.00
01:01:54.00 -71:35:58.00 SMCwing 2 ACIS-I NONE 10.00
01:03:53.00 -73:19:33.00 SMCwing 18 ACIS-I NONE 10.00
01:03:53.00 -72:15:06.00 SMCwing 7 ACIS-I NONE 10.00
01:05:31.00 -71:37:06.00 SMCwing 3 ACIS-I NONE 10.00
01:07:41.00 -72:14:54.00 SMCwing 6 ACIS-I NONE 10.00
01:07:55.00 -73:13:10.00 SMCwing 17 ACIS-I NONE 10.00
01:08:47.00 -72:30:50.00 SMCwing 8 ACIS-I NONE 10.00
01:10:10.00 -71:49:29.00 SMCwing 4 ACIS-I NONE 10.00
01:11:20.00 -72:05:38.00 SMCwing 5 ACIS-I NONE 10.00
01:12:09.00 -73:26:10.00 SMCwing 16 ACIS-I NONE 10.00
01:12:39.00 -72:35:17.00 SMCwing 9 ACIS-I NONE 10.00
01:13:21.00 -72:57:10.00 SMCwing 11 ACIS-I NONE 10.00
01:16:21.00 -73:38:54.00 SMCwing 15 ACIS-I NONE 10.00
01:16:35.00 -72:38:16.00 SMCwing 10 ACIS-I NONE 10.00
01:20:28.00 -73:19:27.00 SMCwing 14 ACIS-I NONE 10.00
01:20:36.00 -72:45:40.00 SMCwing 12 ACIS-I NONE 10.00
01:24:10.00 -73:09:02.00 SMCwing 13 ACIS-I NONE 10.00
===================================================================================
Proposal Number: 06400593
Proposal Title: An ACIS-HETGS, RXTE, and Radio VLA-VLBA TOO of the microquasar
XTE J1748-288
PI: Julia Lee
Subject Category: BH AND NS BINARIES
Abstract: We propose a 140ks HETGS TOO simultaneous with RXTE and radio VLA-VLBA
observations of the microquasar XTE J1748-288 to characterize its broad band
properties for any/all of its previously observed `very high' (30ks), `high'
(40ks) and `low' (70ks) states. We will look for narrow absorption/emission lines
and wind signatures with Chandra, and try to obtain a 0th order X-ray image of
the relativistic jet. Simultaneous RXTE looks will give continuum spectra above 9
keV to assess coronal models and any observed accretion disk changes. Radio data
will be important for detailing the jet behavior while tying into the X-ray
observations to determine the connection between disk, corona and jet. This
proposal was awarded the requested time in Chandra cycles AO2, AO3 & AO5, but not
triggered.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:48:05.10 -28:28:25.80 XTE J1748-288 ACIS-S HETG 30.00
17:48:05.10 -28:28:25.80 XTE J1748-288 ACIS-S HETG 40.00
17:48:05.10 -28:28:25.80 XTE J1748-288 ACIS-S HETG 70.00
===================================================================================
Proposal Number: 06400656
Proposal Title: Follow-up Chandra observation of 4U 1705-44
PI: Tiziana Di Salvo
Subject Category: BH AND NS BINARIES
Abstract: We propose Chandra/HETGS observations of the bright atoll source 4U
1705-44 for 30 ks, to perform a detailed study of the iron K-shell features. A
first Chandra observation of this source shows the presence of an iron Kalpha
line at 6.6 keV, that is found to be intrinsically broad (FWHM about 1.7 keV) and
with a complex profile. Although very interesting, these results need to be
confirmed by a follow-up Chandra observation. This is due to the fact that during
the first observation the source was very bright; although the pile up in the HEG
spectra was still negligible, this unexpectedly resulted in small systematic
differences between the +1 and -1 orders spectra. We therefore propose to
re-observe this source using instrumental modes more appropriate for such a
bright source.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:08:55.00 -44:06:00.00 4U 1705-44 ACIS-S HETG 30.00
===================================================================================
Proposal Number: 06400710
Proposal Title: Spectral and Temporal Studies of the X-ray Emission from the
Double Pulsar Binary System J0737-3039
PI: Maura McLaughlin
Subject Category: BH AND NS BINARIES
Abstract: Our 10-ks DDT observation of the first known double pulsar system
showed it to be easily detectable, with a spectrum that can be fit by a steep
power-law. However, the small number of detected photons prohibited detailed
studies of the spectrum and variability. We therefore request more sensitive
observations with both ACIS-S and HRC-S. These will allow us to discriminate
between various possible models for the X-ray emission and constrain the extreme
interaction between the two pulsars.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
07:37:51.30 -30:39:40.70 J0737-3039 ACIS-S NONE 80.00
===================================================================================
Proposal Number: 06400851
Proposal Title: X-ray Binaries in the Ultrahigh Collision Rate Globular Cluster
NGC 6388
PI: Haldan Cohn
Subject Category: BH AND NS BINARIES
Abstract: We propose a joint Chandra-HST study of the massive, high density
globular cluster NGC 6388 to study its large expected populations of quiescent
low-mass X-ray binaries (qLMXBs) and bright cataclysmic variables (CVs), and to
test for the presence of an intermediate-mass black hole (IMBH). NGC 6388 has the
highest predicted X-ray binary production rate of any Galactic cluster. The
qLMXBs will be used to constrain neutron star accretion models, and neutron star
masses and radii. The CVs will be used to investigate the effects of cluster
structure, metallicity, initial binary fraction, and dynamical history on
accreting binary populations. The proposed 3 orbits of HST U-band imaging would
complement deep HST V and I-band imaging, already in-hand, for identifying
Chandra sources.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:36:17.00 -44:44:06.00 NGC 6388 ACIS-S NONE 50.00
===================================================================================
Proposal Number: 06400876
Proposal Title: Probing the X-ray Emission from Dueling Magnetospheres
PI: Shamibrata Chatterjee
Subject Category: BH AND NS BINARIES
Abstract: The double pulsar system J0737-3039 may provide answers to longstanding
questions about the pulsar emission mechanism and the physics of relativistic
winds. X-ray emission detected with Chandra could be produced by pulsed
magnetospheric emission or at termination shocks located at the wind-wind
boundary or the wind-ISM boundary. We propose high time resolution observations
with HRC-S which will determine the X-ray modulation fraction at the pulsar
rotational and orbital periods, thus distinguishing between the various
possibilities and providing direct constraints on the magnetization parameter of
the relativistic wind.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
07:37:51.30 -30:39:40.70 PSR J0737-3039 HRC-S NONE 89.00
===================================================================================
Proposal Number: 06400892
Proposal Title: Precise Localization of Neutron Star Soft X-ray Transients
PI: Deepto Chakrabarty
Subject Category: BH AND NS BINARIES
Abstract: We propose to observe four neutron star (NS) soft X-ray transients
(SXT) in outburst to obtain accurate source positions. This study will allow us
to reobserve these sources in future cycles to study the quiescent X-ray emission
in NS SXTs. New results from Chandra and XMM suggest that the standard picture of
NS SXT emission may not be as straightforward as previously thought. This
proposal will increase the number of known NS SXTs with good positions, providing
a more uniform sample of the population for future work.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
NS SXT HRC-S NONE 1.00
NS SXT HRC-S NONE 1.00
NS SXT HRC-S NONE 1.00
NS SXT HRC-S NONE 1.00
===================================================================================
Proposal Number: 06400898
Proposal Title: Measuring Dense Clouds with X-rays and Millimeter Waves
PI: Randall Smith
Subject Category: BH AND NS BINARIES
Abstract: Interstellar (IS) dust grains are a difficult puzzle for astronomers,
but we can make significant strides by correlating high-resolution X-ray
observations with velocity-resolved CO maps to probe dense molecular clouds,
where previously only far-infrared data existed. We propose a small survey of
moderately bright, moderately absorbed sources to measure their X-ray halos. We
have chosen sources for which we have CO observations and which will have a
detectable halo while not severely piling up the ACIS detectors. By constraining
the dust models using the grain positions known from the CO measurements of
molecular clouds, we will be able to measure total gas and dust masses as well as
directly measuring coagulation or "mantling" inside dense clouds.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:24:20.10 -30:45:39.00 X1724-307 ACIS-I NONE 25.00
===================================================================================
Proposal Number: 06401081
Proposal Title: Detailed Studies of the Jets in SS 433
PI: Claude Canizares
Subject Category: BH AND NS BINARIES
Abstract: From previous HETGS observations of SS 433, we modeled the X-ray
emission from the jets by an optically thin plasma with abundances slightly
higher than solar, obtaining the jet density and temperature structure in an
abdiabatic cooling model. In an eclipse observation, the coolest part of the
receding jet was blocked by the companion, so we inferred the size of the
companion. With the proposed observations, we plan to a) extend the density
diagnostics to higher densities, b) verify the adiabatic expansion model with the
metallicity assumption with more signal in Ar and Ca lines, c) test for
deceleration, fragmentation, and jet direction changes by comparing to optical
and radio data, d) test the eclipse model, and e) search for more evidence of
photoionization.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:11:49.50 +04:58:58.00 SS 433 ACIS-S HETG 20.00
19:11:49.50 +04:58:58.00 SS 433 ACIS-S HETG 50.00
19:11:49.50 +04:58:58.00 SS 433 ACIS-S HETG 130.00
***********************************************************************************
SN, SNR AND ISOLATED NS
--------------------------------------------------
===================================================================================
Proposal Number: 06500014
Proposal Title: The Surface Temperature of Isolated Neutron Stars
PI: Stephen Murray
Subject Category: SN, SNR AND ISOLATED NS
Abstract: Details of the interior structures of neutron stars remain poorly
understand. In the early stages of their lives, energy loss in neutron stars is
dominated by neutrino emission, but the neutrino emission rate depends critically
on the physical properties of hadrons at high densities. Since the neutrino
luminosity controls the rate at which the star cools, measurements of the surface
temperature for neutron stars of known age can probe the physics of neutron star
interiors. We here propose a high-time resolution observation of PSR B1509-58,
for which the off-pulse emission can provide a direct constraint on the neutron
star temperature. This HRC image will provide no spectral information, and so is
not in conflict with any ACIS observation of this same source.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
15:13:55.60 -59:08:09.00 PSR B1509-58 HRC-I NONE 45.00
===================================================================================
Proposal Number: 06500020
Proposal Title: Spatial extent and spectrum of the X-ray DC component of
millisecond pulsar PSR B1937+21
PI: Mariano Mendez
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose to observe millisecond pulsar PSR B1937+21 for 50 ks with
the ACIS-S in order to obtain a high-resolution X-ray image and an accurate
(total) X-ray spectrum. BeppoSAX observations of PSR B1937+21 revealed an
unresolved ~40% DC component below 4 keV. In addition, the total spectrum of
BeppoSAX appeared to be much softer than the pulsed spectrum. The apparently
soft/thermal(?) DC component could not be well constrained, and might be due to
emission from a heated polar cap by along the magnetic field back flowing
particles, or due to an underlying pulsar wind nebula. With a Chandra ACIS-S
observation it is possible to resolve this ambiguity, and significantly better
spectral information can be obtained for either interpretation.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:39:38.60 +21:34:59.10 PSR B1937+21 ACIS-S NONE 50.00
===================================================================================
Proposal Number: 06500042
Proposal Title: Galactic Supernova Remnant G299.2-2.9
PI: Gordon Garmire
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose to observe a Galactic supernova remnant G299.2-2.9 in order
to resolve the bright X-ray knot and the fine scale blast wave shock structure.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
12:15:33.80 -65:26:33.90 G299.2-2.9 ACIS-S NONE 30.00
===================================================================================
Proposal Number: 06500051
Proposal Title: X-ray Emission from Radio Pulsars
PI: Gordon Garmire
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose exploratory Chandra ACIS observations of two well-known
nearby radio pulsars, B1257+12 and B1133+16. PSR 1257+12 is the famous
millisecond pulsar with a planetary system, while PSR B1133+16 is a radio-bright
nulling pulsar. These pulsars have not been observed with Chandra or XMM, and
only shallow limits were found from short ROSAT observations. The immediate
objective of the proposed observations is to detect the pulsars, estimate their
X-ray fluxes, and crudely characterize their spectra. If the detected X-ray
emission is bright enough, we will propose longer follow-up observations for
phase-resolved spectroscopy.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
11:36:03.30 +15:51:00.70 PSR B1133+16 ACIS-S NONE 20.00
13:00:03.00 +12:40:57.30 PSR B1257+12 ACIS-S NONE 20.00
===================================================================================
Proposal Number: 06500063
Proposal Title: Double Neutron Star Binary with PSR J1537+1155
PI: Gordon Garmire
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose to observe a nearby double neutron star (DNS) binary that
contains the recycled pulsar J1537+1155. This will allow us to measure the
luminosity and spectrum of the X-ray emission from the millisecond pulsar and the
relativistic wind in the binary.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
15:37:10.00 +11:55:55.50 PSR J1537+1155 ACIS-S NONE 36.00
===================================================================================
Proposal Number: 06500081
Proposal Title: Observations of a Bright GRB
PI: Gordon Garmire
Subject Category: SN, SNR AND ISOLATED NS
Abstract: During Cycle 6, we propose time critical Chandra observations of a very
bright gamma-ray burst discovered by HETE, with a fluence of >10^-4 ergs cm-2.
HETE has detected one such burst in 3.5 years, so we estimate a probability of
0.3 of observing such an event during Cycle 6. We will search for X-ray spectral
lines in such an event, using either ACIS-S/LETG for z<1, or ACIS-S/HETG for z>1,
in a 100 ksec observation. The existence of such putative lines is an outstanding
question: if real, they can reveal the circumburst chemical composition and
geometry. The shape of the decay curve, including any absorption changes, will
also bear critically upon the circumburst environment. The Chandra observations
will be carried out as soon as is practical (4-12 days after the GRB).
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
TOO #1 ACIS-S HETG 100.00
===================================================================================
Proposal Number: 06500250
Proposal Title: The origin of X-ray rich Gamma-Ray Bursts: Beacons in the Dark
High-z Universe?
PI: Luigi Piro
Subject Category: SN, SNR AND ISOLATED NS
Abstract: X-ray rich GRBs (a.k.a. X-ray Flash, XRFs) constitute a significant
fraction ($\approx 50\%$) of the population of "standard" long GRB. This class
could hide some of the long-sought members of high-z GRB. For an event at $z>5$,
the peak of the gamma-ray emission and the absorption by Ly$\alpha$ forest clouds
would be redshifted into the X-ray and the optical bands respectively. Thus, a
high-z GRB would appear as a {\it optically dark X-ray rich GRB}. They could also
be a new type of cosmic explosion, likely similar to a GRB, but in which the
fireball expansion is mildly relativistic due to higher fraction of baryon mass
entrained in the shell ("dirty" fireball). We propose to follow-up with
Chandra/ACIS two of these events identified either by SWIFT, HETE-2 or INTEGRAL.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
GRB TOO ACIS-S NONE 60.00
===================================================================================
Proposal Number: 06500265
Proposal Title: Timing the Enigmatic Nearby Neutron Star RX J1308.8+2127
PI: David Kaplan
Subject Category: SN, SNR AND ISOLATED NS
Abstract: The nearest neutron stars identified by their thermal X-ray emission
provide us the best sample to measure the true demography of neutron stars. The
bright soft X-ray source RX J1308.8+2127, with a period of 10-s and a
double-peaked pulse profile, is distinguished from both traditional radio pulsars
and from other radio-quiet neutron stars. Current data allow 3 models: a pulsar
born with the unexpectedly long period of 10 s; a remarkably high B-field (1e13
G) pulsar; or an old magnetar with an even higher magnetic field. The period
derivative provides a clean and clear discriminant of the models. We propose an
optimally designed set of timing observations which, when combined with existing
data, will choose between these models and thus resolve the nature of this
source.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
13:08:48.30 +21:27:06.80 RX J1308.8+2127 ACIS-S NONE 5.00
13:08:48.30 +21:27:06.80 RX J1308.8+2127 ACIS-S NONE 5.00
13:08:48.30 +21:27:06.80 RX J1308.8+2127 ACIS-S NONE 5.00
13:08:48.30 +21:27:06.80 RX J1308.8+2127 ACIS-S NONE 5.00
13:08:48.30 +21:27:06.80 RX J1308.8+2127 ACIS-S NONE 5.00
13:08:48.30 +21:27:06.80 RX J1308.8+2127 ACIS-S NONE 5.00
13:08:48.30 +21:27:06.80 RX J1308.8+2127 ACIS-S NONE 15.00
13:08:48.30 +21:27:06.80 RX J1308.8+2127 ACIS-S NONE 15.00
===================================================================================
Proposal Number: 06500281
Proposal Title: Small-Diameter Galactic Supernova Remnants: The Missing Young
Remnants?
PI: Stephen Reynolds
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose to study four small-diameter Galactic supernova remnants
(SNRs) with well-defined radio shells suggestive of young age, and high radio
surface brightness. Chandra observations should provide reliable ages, and show
if these remnants really are young and can help fill the gap between inferred SN
rates and known young SNRs. None of these objects has been previously resolved in
X-rays, though 3 have been detected. We expect to obtain between 4000 and 30000
counts per remnant, sufficient for moderate to high-resolution imaging and
spatially resolved spectroscopy. We should be able to identify shell emission,
and obtain ages; identify central emission, discriminate possible pulsar-wind
nebulae or compact objects, and characterize ejecta emission if present.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:18:53.70 -15:01:14.00 G15.9+0.2 ACIS-S NONE 30.00
===================================================================================
Proposal Number: 06500291
Proposal Title: X-RAY IMAGING OF PULSAR BOW SHOCKS
PI: Bryan Gaensler
Subject Category: SN, SNR AND ISOLATED NS
Abstract: Pulsar bow shocks provide a laboratory for studying non-thermal
particle populations and shocks under a particularly well-defined geometry. Using
Chandra data on "the Mouse", we have recently carried out the first detailed
X-ray study of a pulsar bow shock, and have directly identified both the
termination shock plus structures in the downstream flow. We now need to compare
these results to other sources, and thus propose Chandra observations of two more
pulsar bow shocks which possibly contain complicated nebular structure. These
data can test our model for the Mouse, allowing us to establish which theories
developed for "Crab-like" nebulae are equally valid for bow shocks, and to
correspondingly focus new theoretical efforts on ways in which these systems may
differ from the Crab.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
06:17:05.20 +22:21:26.70 CXOU J061705.3+22212 ACIS-S NONE 38.00
===================================================================================
Proposal Number: 06500305
Proposal Title: The Oxygen-Rich SNR N132D: Ejecta Detection and Chemical
Abundances
PI: Kazimierz Borkowski
Subject Category: SN, SNR AND ISOLATED NS
Abstract: N132D is the brightest supernova remnant in the Large Magellanic Cloud,
with oxygen-rich filamentary ejecta detected in the optical at its center. O-rich
remnants originate in explosions of massive stars, in this case 30-35 solar
masses. Several solar masses of O-rich ejecta are then expected, and indeed
available Chandra data hint at the central O overabundance. We propose a deep 100
ksec ACIS-S/S3 observation in order to detect and study supernova ejecta, and
determine their chemical composition. An equally important objective is to study
chemical abundances in the ambient shocked interstellar medium. The X-ray derived
chemical abundances will be useful in modeling X-ray spectra of other supernova
remnants in the LMC, and they will be of general interest to the astronomical
community.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:25:02.10 -69:38:30.00 N132D ACIS-S NONE 100.00
===================================================================================
Proposal Number: 06500327
Proposal Title: A Search for the X-ray counterpart of the Unidentified Gamma-Ray
source 3EG J2020+4017
PI: Martin Weisskopf
Subject Category: SN, SNR AND ISOLATED NS
Abstract: The nature of the unidentified gamma-ray source 2CG078+2, which appears
to be in the center of the SNR G78.2+2.1 has remained a mystery since its
discovery in the mid 70's with COS-B. Even the much more sensitive observation
with EGRET has not resolved the puzzle. Although its gamma-ray emission
properties strongly argue for a Geminga-like radio-silent neutron star, this is
only a working hypothesis. ROSAT observations of the remnant had discovered a
possible X-ray counterpart which we pursued in Cycle-4. However, the Chandra
position of the putative counterpart firmly established that the ROSAT source was
not the Gamma-ray source. We follow that work with this proposal for a 15 ksec
ACIS-I observation, centered on the best EGRET position, and not covered in the
previous observation.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
20:21:01.00 +40:17:48.00 3EG J2020+4017 ACIS-I NONE 15.00
===================================================================================
Proposal Number: 06500333
Proposal Title: The Structure and Composition of Pulsar Winds and their Nebulae
PI: Patrick Slane
Subject Category: SN, SNR AND ISOLATED NS
Abstract: Chandra studies of pulsar wind nebulae have revealed stunning new
information on the composition of the winds, the presence of jets and equatorial
outflows, and the structure in and around the wind termination shock. Monitoring
observations reveal temporal variations in resolved structures that challenge our
understanding of particle acceleration and energy flow in these systems. Here we
propose deep observations of G54.1+0.3 and PSR B1509-58 in order to probe the
complex structure in their interior regions at arcsecond resolution. These
observations will allow us to measure the spectrum and morphology of these
features in order to constrain models for particle acceleration, the formation
and structure of jets, and the geometry of particle flows in PWNe.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
15:13:55.60 -59:08:08.90 PSR B1509-58 ACIS-I NONE 47.50
15:13:55.60 -59:08:08.90 PSR B1509-58 ACIS-I NONE 47.50
15:13:55.60 -59:08:08.90 PSR B1509-58 ACIS-I NONE 47.50
15:13:55.60 -59:08:08.90 PSR B1509-58 ACIS-I NONE 47.50
===================================================================================
Proposal Number: 06500351
Proposal Title: Probing the nature of Dark GRBs using Swift and Chandra in
Synergy
PI: Chryssa Kouveliotou
Subject Category: SN, SNR AND ISOLATED NS
Abstract: While most GRBs have X-ray counterparts, only in about half of them
have radio and optical afterglows been found. There exists among these
followed-up GRBs, a handful of events without optical counterparts, albeit with
very faint optical limits. These have been loosely called dark GRBs, and are
quite likely a medley of cases, with some of the optical counterparts being
intrinsically very faint, some highly reddened or redshifted, and some simply
missed due to adverse observing conditions. We propose to perform a 60 ks Chandra
ToO observation of one such dark GRB, selected with a synergy of all instruments
onboard Swift. Our goal is to determine the true origin of the phenomenon and
shed light on GRB progenitors and their environments.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
GRB ACIS-S NONE 60.00
===================================================================================
Proposal Number: 06500381
Proposal Title: RX J193214.6+300741: A young supernova remnant in a low density
medium?
PI: Fangjun Lu
Subject Category: SN, SNR AND ISOLATED NS
Abstract: X J193214.6+300741 is an intriguing small circular X-ray emitting
feature in the Galaxy. The angular size (2.4 arcmin diameter) at a relatively
high Galactic latitude of 5.3 degree suggests a small diameter of 7 pc $d_{10}$,
where $d_{10}$ is the distance in units of 10 kpc. This diameter, together with
the relatively hard ROSAT PSPC spectrum, indicates that the source is a very
young supernova remnant. We propose a 40~ks Chandra ACIS-S observation to obtain
a high-resolution image and a high-quality spectrum of this circular feature, in
order to tightly constrain its physical parameters and thereby unveil its true
nature.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:32:14.60 +30:07:41.00 RX J193214.6+300741 ACIS-S NONE 40.00
===================================================================================
Proposal Number: 06500389
Proposal Title: The PWN Torus of PSR J0538+2817: a stringent test of kick models
PI: Roger Romani
Subject Category: SN, SNR AND ISOLATED NS
Abstract: An ACIS exposure of PSR J0538+2817 in S147 can powerfully test the
origin of pulsar birth kicks. This is because the pulsar has the longest initial
spin period of any radio pulsar/SNR presently known, yet the faint wind nebula
that we discovered in a short AO3 exposure shows symmetry, marking the neutron
star spin axis, well aligned with the proper motion vector. Our predicted large
birth period and proper motion now have a pulsar timing confirmation. We have a
VLBA campaign underway that will provide a high precision velocity vector (and
distance). A sensitive ACIS exposure can complete the test, confirming the
modeled PWN structure and measuring the symmetry axis with comparable precision.
The resulting spin-kick angle measurement can rule out many popular models for
the birth kick.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:38:25.00 +28:17:08.80 PSR J0538+2817 ACIS-I NONE 100.00
===================================================================================
Proposal Number: 06500393
Proposal Title: High-Resolution Soft X-ray Spectroscopy of a Gamma-ray Burst
X-ray Afterglow
PI: Masao Sako
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose a deep TOO observation of a bright X-ray afterglow of a
gamma-ray burst using the Chandra LETG/ACIS-S. The trigger will be based
primarily on the amount of X-ray variability observed during it's early afterglow
phases, which will be monitored with the X-ray Telescope onboard the Swift
satellite. Additional constraints including X-ray flux and line-of-sight Galactic
column density will be imposed as well to provide the highest statistical-quality
grating spectrum of a GRB X-ray afterglow. These criteria, which is based on our
detailed study of the currently-available datasets in the archive, maximizes the
chances of detecting and identifying discrete X-ray features from the circumburst
environment, which will provide us with important clues about the nature of the
progenitor.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
GRB TOO ACIS-S LETG 120.00
===================================================================================
Proposal Number: 06500479
Proposal Title: Astrometric study of isolated neutron stars
PI: Christian Motch
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose to take advantage of the excellent imaging performance of
Chandra to measure the proper motions of two X-ray "dim" isolated neutron stars
discovered by ROSAT and lacking optical identification. We shall obtain
discriminating information on the X-ray powering mechanism and if proper motion
is detected, shall constrain their space velocity and place of birth. This
proposal is the "second epoch" part of a project started in Chandra Cycle 3 by
our group.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
04:20:01.90 -50:22:48.10 RX J0420.0-5022 ACIS-S NONE 20.00
08:06:23.40 -41:22:30.90 RX J0806.4-4123 ACIS-I NONE 20.00
===================================================================================
Proposal Number: 06500496
Proposal Title: Search for Sub-Millisecond Pulsars in 47 Tuc
PI: Robert Rutledge
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose an observation with the ability to detect multiple isolated
sub-millisecond pulsars among the unidentified X-ray sources in 47 Tuc, with
significant secondary science. Observations in the X-ray band overcome the
limited time resolution of even the best radio observations, allowing for the
first time the setting of a new ``speed record'' for pulsars at sub-ms periods,
below the now 20-year-old record of P = 1.558 ms. The detection of sub-ms pulsars
would rule out equations of state for dense matter, provide even better clocks
for their many physics applications, and create a strong impetus for future
improvement of observational techniques. The absence of sub-ms pulsars would
provide compelling evidence for a spin period limit.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
00:24:05.20 -72:04:49.90 47 Tuc HRC-S NONE 120.00
00:24:05.20 -72:04:49.90 47 Tuc HRC-S NONE 170.00
00:24:05.20 -72:04:49.90 47 Tuc HRC-S NONE 170.00
00:24:05.20 -72:04:49.90 47 Tuc HRC-S NONE 170.00
00:24:05.20 -72:04:49.90 47 Tuc HRC-S NONE 170.00
===================================================================================
Proposal Number: 06500531
Proposal Title: A Young Pulsar Candidate on the Galactic Plane
PI: DAVID HELFAND
Subject Category: SN, SNR AND ISOLATED NS
Abstract: A new continuum survey of the Galactic Plane using the VLA at 20cm is
providing images with a fifty-fold improvement in sensitivity and angular
resolution over existing single-dish maps of the plane. Three square degrees of
the survey area has been covered by XMM snapshot observations which have revealed
an intriguing hard X-ray source coincident with a radio point source and
surrounded by a very low surface brightness radio shell -- a classic candidate
for a young radio pulsar. We propose to image this source with Chandra in order
to provide an accurate position for followup in the crowded Galactic Plane and to
resolve any surrounding PWN that is to be expected around a young pulsar.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:30:38.10 -10:02:49.00 G21.6-0.0 ACIS-S NONE 20.00
===================================================================================
Proposal Number: 06500653
Proposal Title: The Structure and Spectrum of W44 s Pulsar Wind Nebula
PI: Robert Petre
Subject Category: SN, SNR AND ISOLATED NS
Abstract: The evolved SNR W44 contains the oldest known Pulsar Wind Nebula (PWN)
with an active pulsar. The PWN is an important evolutionary link between younger
pulsars in PWNe (like the Crab) and the large population of radio pulsars. An
off-axis ACIS observation provided the first image of the PWN, and allowed
measurement of the spectral index of the pulsar and nebula. The poor resolution
afforded only an upper limit for the termination shock radius, and precluded
study of the interaction between the PWN and the surrounding gas. We propose a
deep, on-axis ACIS-S observation to provide a clear view of the pulsar and PWN,
and perform spectroscopy over more regions. We will obtain refined values of PWN
parameters, and better understand its evolution and interaction with its
environment.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:56:10.80 +01:13:21.00 W44 PWN ACIS-S NONE 100.00
===================================================================================
Proposal Number: 06500694
Proposal Title: A Deep Chandra Observation of O-Rich SNR 0540-69.3 in the LMC
PI: Sangwook Park
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose a deep Chandra/ACIS observation of an oxygen-rich supernova
remnant (SNR) 0540-69.3 in the Large Magellanic Cloud (LMC). O-rich SNRs provide
a useful laboratory for the study of core-collapse SN nucleosynthesis and thus
have been intensively studied in X-rays. SNR 0540-69.3 is however a noteworthy
exception: i.e., the X-ray studies of 0540-69.3 has been only preliminary and
some results were even controversial between Chandra and XMM-Newton. The proposed
deep observation with the high angular resolution Chandra/ACIS would be the
unique opportunity for an extensive spatio-spectral analysis of 0540-69.3.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:40:11.20 -69:19:55.10 SNR 0540-69.3 ACIS-S NONE 120.00
===================================================================================
Proposal Number: 06500699
Proposal Title: Monitoring of the Relativistic Magnetohydrodynamic Shock in the
Crab Nebula
PI: KOJI MORI
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose monitoring observations of the Crab Nebula with an
instrumental setup which suppresses event pile-up (i.e, inserting grating and
adopting short frame time) and will allow us for the first time to perform a
spectroscopic study of the variable inner ring and the wisps emerging outward
from the ring. Both the inner ring and the wisps are related to a
magnetohydrodynamic shock where the pulsar wind is terminated, randomized, and
converted into the pulsar wind nebula. Thus, it is crucial to derive the spectral
properties as well as the dynamic properties for understanding of a formation
mechanism of the pulsar wind nebula.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44
05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44
05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44
05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44
05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44
05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44
05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44
05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44
05:34:33.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44
===================================================================================
Proposal Number: 06500734
Proposal Title: Accurate localization of the CCO candidate in SNR G347.3-0.5
PI: Jasmina Lazendic
Subject Category: SN, SNR AND ISOLATED NS
Abstract: The nature of the compact central objects (CCOs) within supernova
remnants is still a puzzle, and identifying new examples can provide vital clues
as to what these sources could be. 1WGA J1713.4-3949 may be a CCO associated with
the remnant G347.3-0.5. We propose observations with Chandra to obtain an
accurate position for 1WGA J1713.4-3949, to enable deep searches for its
optical/NIR counterpart and establish whether this source is a new addition to
the small sample of CCOs in supernova remnants.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:13:28.80 -39:49:51.60 1WGA J1713.4-3949 ACIS-I NONE 10.00
===================================================================================
Proposal Number: 06500795
Proposal Title: Searching for spectral and morphological changes of X-ray
structures in SNR RX J1713.7-3946
PI: Yasunobu Uchiyama
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose a monitoring observation of the northwest rim of the RX
J1713.7-3946, 5-years after the first Chandra observation, as well as a follow-up
observation of the southwest rim. The principal aim of this proposal is to find
changes in the synchrotron X-ray image and intensity of the filaments and
hotspots caused by proper motion and possibly by rapid synchrotron cooling of
multi-TeV electrons responsible for X-ray emission. Only Chandra can achieve the
proper motion measurement owing to its spectacular spatial resolution.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:11:38.90 -39:56:42.10 RX J1713.7-3946 SW ACIS-I NONE 30.00
17:11:45.50 -39:33:23.20 RX J1713.7-3946 NW ACIS-I NONE 30.00
===================================================================================
Proposal Number: 06500799
Proposal Title: A Chandra Study of the Interaction between the Plasma Nebula
RCW89 and the pulsar jet of PSR B1509-58
PI: Yoichi Yatsu
Subject Category: SN, SNR AND ISOLATED NS
Abstract: RCW89 is part of the supernova remnant G320.4-01.2 with the young
pulsar PSR B1509-58 accompanied by the pulsar wind nebula and jet features. Since
RCW89 is located at the terminus of the jet, it has been suggested that the
plasma nebulae are powered by the precessing pulsar-jet. In order to determine
the dynamics of pulsar jets and the secular change of plasma nebula, we will
compare this observation with the past Chandra data of this region on Aug 14,
2000.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
15:13:34.50 -59:02:47.00 RCW89 ACIS-S NONE 30.00
===================================================================================
Proposal Number: 06500831
Proposal Title: G20.0-0.2: REVEALING A MODEST CRAB-LIKE SUPERNOVA REMNANT
PI: DAVID HELFAND
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose to observe the bright Crab-like radio supernova remnant
G20.0-0.2 with Chandra. This center-filled remnant was only recently detected in
X-rays, serendipitously in a very short (few~ks) XMM-Newton observation, well
off-axis. The goal is to locate and obtain a spectrum of the putative pulsar and
of its pulsar wind nebula. This will add another precious example of a newly born
neutron star to the census. Given that the birth properties of neutron stars
provide unique and critical information on the process of stellar core collapse
and the heavy element nucleosynthesis which accompanies it, each hard fought
example represents an important addition.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:28:10.60 -11:35:40.80 G20.0-0.2 ACIS-S NONE 35.00
===================================================================================
Proposal Number: 06500837
Proposal Title: Large-Scale Shock Interactions in Puppis A
PI: Una Hwang
Subject Category: SN, SNR AND ISOLATED NS
Abstract: The Puppis A supernova remnant is interacting with interstellar clouds
along its eastern border. The brightest feature in the remnant (the Bright
Eastern Knot) is a recently shock interstellar cloud, while a large HI and CO
cloud abuts the remnant's entire eastern border to the north. Existing Chandra
X-ray observations of small, isolated fields in this region reveal spectral
structures that involve a complicated mixture of temperature, ionization, and
column density effects. We propose five mosaicked ACIS-I observations of the
entire eastern region to obtain a global picture of the shock interaction.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
08:23:32.30 -42:46:42.20 Puppis A NE Shock Fr ACIS-I NONE 65.00
===================================================================================
Proposal Number: 06500846
Proposal Title: X-ray Bursts from Anomalous X-ray Pulsars
PI: VICTORIA KASPI
Subject Category: SN, SNR AND ISOLATED NS
Abstract: Recently the magnetar model for anomalous X-ray pulsars (AXPs) was
given a significant deciding boost by the discovery of Soft-Gamma-Repeater-like
bursts from AXPs. However, the basic energetics and radiative behavior of
magnetar outbursts is suprisingly diverse given the very few such events
observed. Understanding this puzzle is important as outbursts hold tremendous
promise for constraining the physics of magnetars and neutron-star structure in
general. We request Chandra TOO observations following the next two AXP outbursts
in order to study the evolution of magnitude and spectrum of the pulsed and
persistent emission, and, if necessary, verify the identity of the burster.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
Anomalous X-ray Puls ACIS-S NONE 20.00
Anomalous X-ray Puls ACIS-S NONE 20.00
Anomalous X-ray Puls ACIS-S NONE 20.00
Anomalous X-ray Puls ACIS-S NONE 20.00
Anomalous X-ray Puls ACIS-S NONE 20.00
Anomalous X-ray Puls ACIS-S NONE 20.00
Anomalous X-ray Puls ACIS-S NONE 20.00
Anomalous X-ray Puls ACIS-S NONE 20.00
===================================================================================
Proposal Number: 06500886
Proposal Title: IS SGR 1627-41 A DIM ISOLATED NEUTRON STAR?
PI: Chryssa Kouveliotou
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose a series of three monitoring observations of the persistent
emission from SGR1627-41 with CXO, to study the evolution of its persistent flux
emission. A source detection (at a constant or a decaying trend) would probe
heating and cooling dynamics of magnetars at a far more sensitive level than has
been done in the past. An upper limit of 6.3x10e(-15) erg/cm^2 s would imply that
its persistent emission is more than 1000 times lower than that of typical
magnetars and would identify the tip of a much larger `iceberg' of magnetars that
have escaped detection until now; our observations may even provide the first
direct link between SGRs and Dim Isolated Neutron Stars (whose luminosities
SGR1627-41 seems to be approaching pretty fast).
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
16:35:51.80 -47:35:23.30 SGR 1627-41 ACIS-S NONE 6.67
16:35:51.80 -47:35:23.30 SGR 1627-41 ACIS-S NONE 6.67
16:35:51.80 -47:35:23.30 SGR 1627-41 ACIS-S NONE 6.67
===================================================================================
Proposal Number: 06500899
Proposal Title: Catching a Bright Swift Gamma-Ray Burst With Chandra
PI: James Reeves
Subject Category: SN, SNR AND ISOLATED NS
Abstract: In this proposal we request a 100ks Chandra-LETG TOO observation of one
bright Gamma-ray burst, to be detected in the first year of operations of NASA's
dedicated GRB mission, Swift. Swift is currently scheduled for launch in
September 2004, providing a unique window of opportunity in AO-6 to initiate a
Chandra follow-up observation of an exceptionally bright burst. This will allow
us to obtain a high quality, high resolution grating spectrum of the X-ray
afterglow, enabling us to detect X-ray emission lines, from elements such as Mg,
Si, S, Ar, Ca and Fe in the afterglow spectrum. We will also determine the
velocities of the emission lines and measure how they evolve with time, which is
key for determining the physical origins of the hot, dense matter that surrounds
GRBs.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
Swift GRB TOO1 ACIS-S LETG 100.00
===================================================================================
Proposal Number: 06500904
Proposal Title: The Energetics and Host Galaxies of X-ray Flashes
PI: Derek Fox
Subject Category: SN, SNR AND ISOLATED NS
Abstract: The X-ray flashes (XRFs) occur at the cosmological distances of
gamma-ray bursts (GRBs), but possess a non-thermal spectrum that peaks in the
X-ray rather than the gamma-ray band. With an explosive energy similar to that of
GRBs and supernovae (SNe), XRFs appear to couple an intermediate fraction of
their energy to highly-relativistic ejecta. We have discovered the first four XRF
afterglows and three of their likely host galaxies, and we propose a Chandra-HST
program to substantially increase this sample. Chandra observations of the XRF
afterglow will provide sub-arcsec astrometry and an estimate of its explosive
energy; subsequent HST observations will characterize its host galaxy. These
observations will help clarify the nature of the XRFs, the most likely link
between GRBs and SNe.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
XRF Flux/Astrometry ACIS-S NONE 20.00
XRF Flux/Astrometry ACIS-S NONE 20.00
===================================================================================
Proposal Number: 06500918
Proposal Title: Chandra AO6 Monitoring Images of SNR1987A
PI: David Burrows
Subject Category: SN, SNR AND ISOLATED NS
Abstract: SNR1987A provides a unique opportunity to study the development of a
young supernova remnant at high resolution. We have monitored SN/SNR1987A at
roughly six month intervals since October 1999. The remnant is expanding and is
increasing rapidly in brightness. We propose to continue this monitoring program
with two 50 ks observations in AO5, spaced six months apart. The remnant is now
bright enough that these observations will permit spatially-resolved spectra in
addition to monitoring the expansion (expected to begin slowing in the next year
or two) and the development of new X-ray hot spots. They will also allow us to
continue our search for a compact central object, which may become visible in the
next year or two as the ejecta become optically thin.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:35:28.00 -69:16:11.10 SNR1987A