Chandra Cycle 5 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
- Active Galaxies and Quasars
- Clusters of Galaxies
- Extragalactic Diffuse Emission and Surveys
- Galactic Diffuse Emission and Surveys
***********************************************************************************
SOLAR SYSTEM
--------------------------------------------------
===================================================================================
Proposal Number: 05100445
Proposal Title: A Search for Soft X-Ray Auroras on Earth
PI: Ronald Elsner
Subject Category: SOLAR SYSTEM
Abstract: Chandra HRC-I observations of Jupiter in Dec 2000 revealed that jovian
auroral x-ray emissions originate from a small 'hot' spot. The location of the
hot spot near the magnetic pole implies a particle source region near Jupiter's
magnetopause, and entry of heavy solar wind ions due to high-latitude
reconnection is now a viable explanation for the soft x-ray emissions. The
identical process should work at Earth as well. Although hard x-ray emissions
from electron bremsstrahlung are known in the terrestrial aurora, there have been
no searches for emissions less than 2 keV. We propose here simple slews
observations by HRC-I across the auroral region to look for Earth's soft x-ray
aurora. The proposed method has been shown to be feasible in a 1 ks DDT
observation.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
NULL HRC-I NONE 1.20
NULL HRC-I NONE 1.20
NULL HRC-I NONE 1.20
NULL HRC-I NONE 1.20
NULL HRC-I NONE 1.20
NULL HRC-I NONE 1.20
NULL HRC-I NONE 1.20
NULL HRC-I NONE 1.20
NULL HRC-I NONE 1.20
NULL HRC-I NONE 1.20
===================================================================================
Proposal Number: 05100494
Proposal Title: SEARCH FOR X-RAYS FROM SATURNIAN SYSTEM
PI: J WAITE
Subject Category: SOLAR SYSTEM
Abstract: We propose to use HRC-I and ACIS-S for 156 ksec to search for x-rays
from the Saturnian system including Saturn, Titan and the rings, in coordination
with in situ solar wind particle and field measurements from Cassini and the
Hubble Space Telescope Far Ultraviolet auroral imaging. In view of the strong
auroral activity on Saturn that has been shown to correlate with variations in
the solar wind impinging upon Saturn's magentosphere, and the recent Jupiter
observations with Chandra that may imply a role for the solar wind in x-ray
production at Jupiter, we anticipate the production of observable x-rays from
Saturn's auroral zones. These observations will be crucial in understanding the
auroral physics at Saturn in the context of comparative planetary aurora.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
SATURN ACIS-S NONE 39.00
SATURN ACIS-S NONE 39.00
===================================================================================
Proposal Number: 05100560
Proposal Title: High Resolution Imaging of the Source of Comet Encke's X-Rays
Over One Nuclear Rotation
PI: Carey Lisse
Subject Category: SOLAR SYSTEM
Abstract: The highly favorable perigee passage of the x-ray bright comet 2P/Encke
in late 2003 provides an excellent opportunity to finally use Chandra's full
spatial and temporal resolution to resolve cometary x-ray emission. In 54 ksec,
during 1 rotation of Encke's nucleus, we will use the ACIS-S instrument to answer
the following major questions concerning this new class of x-ray emitters: How do
x-ray emitting regions relate to plasma structures in the coma? Are there spatial
and temporal variations in the emission due to variability in the solar wind and
the 15 hour rotation period of the comet? Are there CXE lines due to N, Ne and Fe
present in the emission spectrum, and what is the observed comet-to-comet
O^+6/O^+7 line ratio variability due to?
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
2P/Encke (2003) ACIS-S NONE 54.00
***********************************************************************************
NORMAL STARS AND WD
--------------------------------------------------
===================================================================================
Proposal Number: 05200013
Proposal Title: AN X-RAY STUDY OF THE YOUNG OPEN CLUSTER NGC 2362
PI: Stephen Murray
Subject Category: NORMAL STARS AND WD
Abstract: Using the ACIS-I, we will observe the young open cluster NGC 2362 in
order to study the coronal properties of its 5 Myr-old pre-main-sequence stars.
Notwithstanding its moderate distance of about 1500 pc, this very rich cluster
can be considered an evolved version of the Orion Nebula Cluster and is therefore
of particular interest, both for star formation studies (e.g., of the Initial
Mass Function) and for coronal activity research. Low line-of-sight extinction
and the absence of circumstellar disks ease both observation and interpretation.
With the requested exposure time of 100 ksec we expect to detect several hundred
late-type stars, yielding a substantial fraction of the entire cluster
population.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
07:18:42.80 -24:57:18.50 NGC 2362 ACIS-I NONE 100.00
===================================================================================
Proposal Number: 05200031
Proposal Title: AGE AND TEMPERATURE DEPENDENCE OF X-RAY ACTIVITY AT THE COOL END
OF THE MAIN-SEQUENCE
PI: BEATE STELZER
Subject Category: NORMAL STARS AND WD
Abstract: We propose for ACIS imaging observations of five very low-mass field
dwarfs to probe the age and temperature dependence of magnetic activity near the
substellar boundary. We will observe confirmed companions to main-sequence stars
(this provides the individual ages) which cover a range in effective temperature.
X-rays are ubiquitously found in young pre-main sequence stars of very low masses
and Brown Dwarfs, but the observation of LP 944-20 (500 Myrs) supports the idea
that X-ray emission evolves as the stars (or Brown Dwarfs) age, on an as yet
unknown timescale. Since the effective temperature decreases during stellar
evolution a possible explanation is that cool atmospheres are too neutral to
sustain stellar coronae. Our observations will be able to confirm or reject this
hypothesis.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
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14:50:18.10 +23:54:42.00 HD 130948 BC ACIS-S NONE 50.00
14:54:31.20 +16:06:08.00 Gl 569 BC ACIS-S NONE 25.00
19:22:51.80 -54:25:30.00 HR 7329 B ACIS-S NONE 50.00
===================================================================================
Proposal Number: 05200040
Proposal Title: Study of Pre-Main Sequence Stars Near the Beginning of their
Accretion Phase
PI: Claude Canizares
Subject Category: NORMAL STARS AND WD
Abstract: The Trapezium Cluster at the center of the Orion Nebula Cluster (ONC)
is one of the youngest and closest (440 pc) active star-forming regions. 80% of
the stars are younger than 1 Myr, with a median age of 3x10^5 yr. Many of the
late-type PMS stars are actually still protostars in their adiabatic contraction
phases. What happens during this accretion phase is still quite mysterious. Many
of the properties we know todays are derived from their X-ray signatures. Here we
study highly resolved X-ray spectra of a large ensemble of very young and
chemically similar PMS stars in terms of their magnetic and accretion properties.
In this pointing we add an area to our sample that has specifically X-ray bright
members of the ONC unobstructed by the Trapezium core stars.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:35:20.10 -05:26:39.10 Orion Nebula Cluster ACIS-S HETG 50.00
05:35:20.10 -05:26:39.10 Orion Nebula Cluster ACIS-S HETG 50.00
===================================================================================
Proposal Number: 05200045
Proposal Title: Observation of the Core of the RCrA Dark Cloud
PI: Gordon Garmire
Subject Category: NORMAL STARS AND WD
Abstract: This is the third observation of this star-forming region where ~100
sources were detected in the first observation. This observation will improve
spectral data and time variability studies.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
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19:01:50.60 -36:57:30.00 RCrADarkCloud ACIS-I NONE 20.00
===================================================================================
Proposal Number: 05200058
Proposal Title: Observation of a brown dwarf, GJ1245ABC
PI: Gordon Garmire
Subject Category: NORMAL STARS AND WD
Abstract: This is the second observation of the brown dwarf system GJ1245ABC,
with C being the brown dwarf. Flares may have been detected in the previous
observation of 12 ks.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:53:54.80 +44:24:54.00 GJ1245 ACIS-I NONE 25.00
===================================================================================
Proposal Number: 05200068
Proposal Title: ACIS Observations of the Massive Star-Forming Complex NGC 6357
PI: Gordon Garmire
Subject Category: NORMAL STARS AND WD
Abstract: NGC 6357 is a prominent H II region complex and galactic ring nebula in
the Galactic Plane. It is possibly associated with the massive star-forming
complex NGC 6334; both are in the Sagittarius Arm and are at the same distance,
separated by about 1.5 degrees on the sky. Two 40-ksec Chandra observations of
NGC 6334 were obtained in Aug-Sept 2002. We request two 40-ksec Chandra
observations of NGC 6357 to cover its main H II regions and known concentrations
of X-ray emission. These observations will be directly comparable to the NGC 6334
data; the exposures are long enough to detect diffuse emission as well as the OB
stars and hundreds of pre-main-sequence point source components.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
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17:24:43.40 -34:11:56.00 NGC 6357 Field I ACIS-I NONE 40.00
===================================================================================
Proposal Number: 05200074
Proposal Title: Chandra study of the IC 1396-N globule and its neighborhood
PI: Gordon Garmire
Subject Category: NORMAL STARS AND WD
Abstract: We propose to study the X-ray properties of two different populations
of YSOs in IC 1396 extended HII region: one is the very young compact cluster of
embedded sources in IC 1396-N globule that represents the "small scale sequential
star formation"; another is a sample of young late-type PMS stars, surrounding
the globule, and related to the open star cluster Trumpler 37 with an age of 3
million years.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
21:40:42.40 +58:16:09.70 IC 1396-N ACIS-I NONE 30.00
===================================================================================
Proposal Number: 05200123
Proposal Title: A comprehensive survey of X-ray emission from the earliest
phases of star formation
PI: Fabio Favata
Subject Category: NORMAL STARS AND WD
Abstract: We propose to conduct a comprehensive survey of X-ray emission from the
earliest phases of star formation, in particular of Class O sources. This will be
conducted with a deep (100 ks) imaging observation of the Serpens molecular
cloud, the best (and nearest) site for the proposed science. Our survey will
detect X-ray emission from a significant number of Class 0 and Class I sources,
allowing to conclusively establish when does X-ray emission start to become
important in the star formation process and to constrain the relevant emission
mechanisms.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:29:50.00 +01:15:30.00 Serpens cloud core ACIS-I NONE 100.00
===================================================================================
Proposal Number: 05200140
Proposal Title: The Early Onset of X-ray Emission from Planetary Nebulae
PI: Joel Kastner
Subject Category: NORMAL STARS AND WD
Abstract: CXO has ushered in a new era in the study of planetary nebulae (PNs),
with its discoveries of diffuse X-ray emission from a handful of PNs. These first
results have raised fundamental questions concerning the varied optical and X-ray
morphologies of PNs. Our small survey targets a PN parameter space ---
specifically, young PNs with Wolf-Rayet central stars --- that should provide
answers. These ``[WC] PNs'' are presently driving fast, massive winds into
material ejected during their (recently terminated) red giant evolution.
High-resolution X-ray imaging of WC PNs will offer unique insight into the early
onset of PN X-ray emission and, hence, the wind collision processes that shape
PNs. HST images will establish whether and how absorption determines X-ray
morphology.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
00:13:01.00 +72:31:19.00 NGC 40 ACIS-S NONE 20.00
13:52:30.60 -66:23:24.00 Hen 2-99 ACIS-S NONE 30.00
===================================================================================
Proposal Number: 05200142
Proposal Title: Resolving the 36 Oph and 70 Oph Binary Systems and Correlating
Their Coronal Properties with Their Winds
PI: Brian Wood
Subject Category: NORMAL STARS AND WD
Abstract: We propose to observe two nearby (d=5 pc) K dwarf binary systems, 36
Oph and 70 Oph, with Chandra's LETGS grating. Recent measurements of the winds of
36 Oph and 70 Oph from HST data suggest that their mass loss rates differ by a
factor of 8 despite almost identical levels of activity. The winds of solar-like
stars originate in their coronae, so the coronal X-ray spectra of these stars is
a natural place to search for the cause of this difference. Our Chandra
observations will resolve these binary systems for the first time in X-rays, so
our two binaries should provide four high quality LETGS spectra, from which we
can determine coronal abundances, densities, and emission measure distributions
for all four stars.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:15:21.00 -26:36:10.20 36 Oph HRC-S LETG 80.00
18:05:27.30 +02:30:00.40 70 Oph HRC-S LETG 80.00
===================================================================================
Proposal Number: 05200156
Proposal Title: Coronal X-Rays from single, Cool, Magnetic White Dwarfs
PI: Virginia Trimble
Subject Category: NORMAL STARS AND WD
Abstract: X-ray coronal activity in magnetic white dwarfs is predicted by theory
but has not yet been detected. Our objective is to use Chandra for deep exposures
of a carefully selected, small sample of single, cool, magnetic white dwarfs.
X-ray detection will support the contention that the magnetic fields in some of
these ``dead stars'' are in fact dynamic, and not just fossils of their youthful
dynamos. Moreover, white dwarf X-rays would provide a perspective on coronal
heating under circumstances very different from the solar case. Non-detection
will set a stringent limit of at most 1e25 erg/s for the coronal X-ray emission
and so set fairly tight limits on the efficiency with which the magnetic fields
transport acoustic-wave energy upwards.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
16:40:57.00 +53:41:18.00 GD356 ACIS-S NONE 35.20
===================================================================================
Proposal Number: 05200159
Proposal Title: A DEEP LOOK AT THE NEAREST BROWN DWARF: EPSILON INDI B, A T2.5
DWARF
PI: Marc Audard
Subject Category: NORMAL STARS AND WD
Abstract: We propose a deep, exploratory observation of a T brown dwarf in the
X-rays. Epsilon Indi B (T2.5) lies at 3.6 pc and is thus the nearest brown dwarf.
X-ray detections of brown dwarfs have yet been limited to spectral type M. The
cool, dense neutral photospheres of L and T dwarfs should hamper magnetic
activity. However, strong peristent and flaring Halpha emission has been detected
down to spectral type T. Despite claims that some other mechanisms (e.g.,
accretion, binary interaction) may be reponsible, the status of magnetic activity
in L and T brown dwarfs is far from clear. Our 70ks observation of this "old"
brown dwarf will reach Lx=8.5e23 erg/s, equivalent to a ratio log (Lx/Lbol)=-5.
The Chandra data will provide strong insights into magnetic activity in late
brown dwarfs.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
22:04:12.60 -56:47:08.10 EPSILON INDI B ACIS-S NONE 70.00
===================================================================================
Proposal Number: 05200178
Proposal Title: Do Carbon-rich Wolf-Rayet Stars Emit X-rays ?
PI: Svetozar Zhekov
Subject Category: NORMAL STARS AND WD
Abstract: We propose to conduct a sensitive search for X-ray emission in four of
the closest known carbon-rich (WC) Wolf-Rayet stars. Our primary objective is to
determine if single WC stars without companions are X-ray emitters. Although it
is often asserted that WC stars emit X-rays via shocks in their powerful winds,
our archive search shows no convincing WC-star X-ray detections and a recent 16
ksec XMM observation of WR111 (WC5) resulted in a surprising non-detection. The
high-opacity of carbon-rich winds or structural changes that occur in the
terminal WC phase may lead to lower levels of X-ray emission than seen in their
evolutionary precursors, the nitrogen-rich WN stars.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
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20:11:53.50 +36:11:50.50 WR 135 ACIS-S NONE 20.00
===================================================================================
Proposal Number: 05200193
Proposal Title: SHOCKS AND X-RAYS IN PROTOSTELLAR JETS
PI: MANUEL GUEDEL
Subject Category: NORMAL STARS AND WD
Abstract: Evidence for magnetic fields in very young stellar objects and large
X-ray flares suggest a coronal/magnetospheric origin of protostellar X-rays, but
an additional, significant source of X-ray emission may relate to the base of
bipolar jets within a few tens of AU from the star, where the accelerating winds
shock-ionize ambient material. This proposal aims at testing the hypothesis that
part of the observed X-rays originate from strong shocks in these compact inner
jet regions. This project will provide important diagnostics for the jet
launching environment and its energetics.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
04:22:00.70 +26:57:33.30 FS Tau AB ACIS-S NONE 30.00
04:27:02.60 +26:05:30.90 DG Tau AB ACIS-S NONE 30.00
05:35:29.80 -06:26:57.70 HH34 IRS ACIS-S NONE 30.00
05:51:46.20 +02:48:29.70 HH111 ACIS-S NONE 30.00
===================================================================================
Proposal Number: 05200234
Proposal Title: Planet formation and the missing 10 Myr old stars
PI: Eric Feigelson
Subject Category: NORMAL STARS AND WD
Abstract: Our understanding of planet formation requires large, unbiased and
nearby samples of older pre-main sequence stars around 10 Myr old. Four groups of
such stars have recently been found around the closest OB association, Sco-Cen,
with a combination of kinematical and X-ray selection criteria. We propose here a
Chandra snapshot survey to discover more of these stars. The targets constitute a
well-defined sample of B stars on the outskirts of Sco-Cen with kinematics
consistent with Sco-Cen membership. In successful cases, the X-ray image will
reveal coeval low-mass stars around 10 Myr old which will then be subject to
optical and infrared disk study to characterize the later phases of planet
formation.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
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08:35:52.00 -50:58:10.00 HIP 42177 ACIS-I NONE 3.00
08:40:19.20 -40:15:50.00 HIP 42540 ACIS-I NONE 3.00
08:41:19.60 -78:57:48.00 eta Cha ACIS-I NONE 10.00
09:26:18.00 -53:22:44.00 HIP 46283 ACIS-I NONE 3.00
===================================================================================
Proposal Number: 05200247
Proposal Title: Triggered Star Formation and the Remarkable Carina OB Cluster
Trumpler 14
PI: Leisa Townsley
Subject Category: NORMAL STARS AND WD
Abstract: We propose to use a 60-ksec ACIS pointing centered on the young, dense,
massive OB cluster Trumpler 14 as a testbed for understanding recent and ongoing
star formation in the Carina star-forming complex. Our goals are: to untangle the
relative contributions to the X-ray emission from high mass vs. intermediate/low
mass stars, embedded vs. unobscured stars, and stars vs. diffuse shock emission
from OB winds, supernova remnants, or HII region shocks; to study X-rays from
stars associated with CO clumps and embedded stellar clusters; and to examine the
relationships between the X-ray luminosity function (LF), K-band LF, and
theoretical initial mass function over a wide range (tenths to tens of solar
masses).
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
10:43:57.50 -59:32:53.00 Trumpler 14 ACIS-I NONE 60.00
===================================================================================
Proposal Number: 05200250
Proposal Title: X-ray Flows from the Giant HII Region NGC 3576
PI: Leisa Townsley
Subject Category: NORMAL STARS AND WD
Abstract: We propose a 60-ksec ACIS observation of the Galactic giant HII region
NGC 3576, to image and confirm a soft X-ray bubble suggested by ROSAT data and
likely due to flows created by the winds of OB stars powering the HII region.
This observation will also reveal the massive stellar engine powering NGC 3576,
shredding the molecular cloud from which it formed, and triggering a new
generation of massive star formation. This target bears many similarities to the
edge-on `blister' HII region M 17 (the Omega Nebula), where such soft X-ray flows
were first confidently detected by Chandra. We hope to establish whether these
wind-blown bubbles, filled with hot X-ray-emitting gas, are ubiquitous in blister
HII regions (given O stars of sufficient wind power) or unique to M 17 for some
reason.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
11:11:53.80 -61:18:25.00 NGC 3576 ACIS-I NONE 60.00
===================================================================================
Proposal Number: 05200369
Proposal Title: Establishing Jet-excited X-ray Emissions from Protostars with
High-resolution Imaging with Chandra/ACIS
PI: Masahiro Tsujimoto
Subject Category: NORMAL STARS AND WD
Abstract: We propose ACIS-I observations on three YSOs that accompany
protostellar jets. Our deep Chandra observation on Orion Molecular Cloud 3
revealed a new type of X-ray emissions in SFRs; i.e., X-rays originating from
shock-excited plasma by high velocity (v=1000 km/s) protostellar jets in the
proximity of a protostar. The purposes of the observations are (1) to establish
the this type of X-ray emissions with a larger number of detections and (2) to
examine any correlation between X-ray luminosity or plasma temperature with the
existing centimeter flux density to test our interpretation. Once this type of
emission is established, we will obtain a strong tool to measure the highest
velocity component in protostellar jets and to estimate the rotation period of
protostars.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
03:25:36.40 +30:45:15.00 L1448 N-A ACIS-I NONE 74.00
===================================================================================
Proposal Number: 05200343
Proposal Title: Exploring X-rays in protostellar jets
PI: Bo Reipurth
Subject Category: NORMAL STARS AND WD
Abstract: With this proposal we want to explore the role of X-rays in the
formation and evolution of protostellar jets. We have just completed a detailed
Chandra study of a collimated jet from a newborn star, L1551 IRS5, and found
strong X-ray emission near the base of the jet. This result adds a new dimension
to our understanding of protostellar jets, demonstrating that the jet launch and
collimation region contains high-temperature X-ray emitting plasma which was
unknown from low frequency studies. We now propose to follow up on this result by
studying 4 protostellar jets from sources at very early evolutionary stages.
Their detection, or non-detection, will pose new constraints on our understanding
of jet launch and collimation.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
04:26:56.30 +24:43:35.00 HH 300 ACIS-I NONE 25.00
04:29:23.70 +24:33:00.00 HH 184 ACIS-I NONE 25.00
===================================================================================
Proposal Number: 05200465
Proposal Title: The Nature of the X-ray Emission from the Arches Cluster and its
Vicinity
PI: Q. Daniel Wang
Subject Category: NORMAL STARS AND WD
Abstract: The Arches cluster provides a unique laboraotry for understanding a
very compact young massive stellar system and its interaction with the Galactic
center environment. We request a deep and on-axis ACIS-I observation to probe the
nature of the strong X-ray emission detected serendipitously from the cluster.
The improved X-ray spatial resolution and sensitivity will allow for 1) X-ray
detections of all massive colliding wind binaries, 2) accurate positional
measurements of individual X-ray sources for reliable multiwavelength
identifications, 3) spectral and timing analyses to determine the nature of the
sources, and 4) spatially-resolved spectroscopy of both the diffuse X-ray
emission from the cluster wind and the X-ray reflection by molecular gas in the
vicinity.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:45:50.30 -28:49:20.00 Arches Cluster ACIS-I NONE 100.00
===================================================================================
Proposal Number: 05200474
Proposal Title: Cosmic Ray Acceleration and Non-thermal X-rays in Cyg OB2
PI: Yousaf Butt
Subject Category: NORMAL STARS AND WD
Abstract: The astrophysical sites where Galactic cosmic ray (GCR) nuclei gain
their extreme energies continue to defy indentification. It has been argued that
the interacting, supersonic winds blowing from the many massive stars in young
stellar associations - together with any SNRs therein - will set up shocks whose
scale, power and duration could accelerate particles to CR energies. Thus, the
HEGRA group's recent report of a steady and extended TeV-range gamma-ray source
lying within the Cygnus OB2 association is extremely interesting. We obtained a
short CHANDRA DDT + VLA exposure of this source. Here we propose to make a deeper
study, again with the VLA, in order to ascertain whether OB associations could be
really be accelerating cosmic rays, as appears to be the case.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
20:32:07.00 +41:30:30.00 Cygnus OB2 North Wes ACIS-I NONE 50.00
===================================================================================
Proposal Number: 05200582
Proposal Title: Probing Pre-main Sequence Accretion with HETGS: the Hen 3-600
Binary
PI: Joel Kastner
Subject Category: NORMAL STARS AND WD
Abstract: We propose to obtain Chandra/HETGS spectra of a close (1.4''
separation) binary pre-main sequence (PMS) system, Hen 3-600, which is a
particularly well-studied member of the nearby (D = 50 pc) TW Hya Association.
Results for fundamental plasma physical conditions (e.g. temperatures and
densities) derived from these spectra, when compared with previous Chandra/HETGS
results for both PMS and active, main-sequence stars, will provide new insight
into the relationship between PMS X-ray emission and PMS stellar accretion and
magnetic activity. The unique potential to obtain high-quality, spatially
resolved spectra of a coeval PMS binary makes these observations a particularly
cost-effective use of 100 ks of Chandra/HETGS observing time.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
11:10:27.90 -37:31:52.00 Hen 3-600 ACIS-S HETG 100.00
===================================================================================
Proposal Number: 05200622
Proposal Title: Triggered Star Formation and Diffuse Emssion in Ara OB1
PI: Scott Wolk
Subject Category: NORMAL STARS AND WD
Abstract: We propose deep observations of the unique, nearby (1.3 kpc) and
related massive star forming regions NGC 6193 (75 ks) and RCW 108 (100ks) located
< 4pc apart. NGC 6193 contains several early O stars which are less than 3 Myr
old. The winds from these stars are inducing the star formation in the embedded,
< 0.5 Myr, RCW 108 which also contains at least 1 O star. The NGC 6193 O stars
offer a unique opportunity to observe the interaction of winds from O stars
separated by 13,000 A.U. (10" = 0.06pc). The comparative study of the revealed,
older NGC 6193 and the embedded younger RCW 108 cluster, both containing OB
stars, will give insight into triggered star formation, diffuse emission in
regions of massive star formation, the X-ray evolution of young stars.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
16:40:00.10 -48:51:45.00 RCW 108 ACIS-I NONE 100.00
===================================================================================
Proposal Number: 05200638
Proposal Title: Wind-Wind Interactions and Stellar Magnetic Fields in
Pre-Planetary Nebulae
PI: Raghvendra Sahai
Subject Category: NORMAL STARS AND WD
Abstract: Preplanetary nebulae (PPNs) - the progenitors of planetary nebulae
(PNs) - hold the key to our understanding of the very late stages of stellar
evolution. Recent HST studies show that the fast wind-slow wind interaction
process believed to produce diffuse X-ray emission from PNs, must already be
active in PPNs. Our Cycle 3 discovery of nebular X-ray emission from the PPN Hen
3-1475 provides strong support for this conjecture, and important clues to the
nature of the interaction. We propose to observe X-ray emission from 5
well-studied PPNs with very fast outflows using ACIS-S. These data will directly
probe the very hot (10$^{7-8}$K) shocked gas resulting from the interaction, and
the presence of stellar magnetic fields which may be responsible for collimating
the fast outflows.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
04:42:53.60 +36:06:53.60 AFGL 618 ACIS-S NONE 50.00
11:38:33.70 -55:34:25.80 HD101584 ACIS-S NONE 25.00
17:03:09.70 -47:00:28.00 IRAS16594-4656 ACIS-S NONE 40.00
19:36:18.80 +29:32:51.40 M1-92 ACIS-S NONE 40.00
21:02:18.80 +36:41:38.00 AFGL 2688 ACIS-S NONE 35.00
===================================================================================
Proposal Number: 05200705
Proposal Title: Using LETG Spectra to Probe Anomalous Heating in the Upper
Atmospheres of B Stars
PI: Joseph Cassinelli
Subject Category: NORMAL STARS AND WD
Abstract: Measurements from both EUVE and H-alpha maps of HII regions in the sky
show that near-Main Sequence B stars have anomalously strong EUV fluxes. We
propose using LETG with ACIS-S to observe the two particularly well studied Beta
Cephei variable stars Beta CMa and Spica (Alpha Vir) to diagnose the physical
conditions of the X-ray regions and derive information regarding the heating of
the outer atmosphere (the EUV formation region and upward). We will investigate
if these stars are showing a transition in X-ray production from the wind shock
sources of the luminous O stars to the denser magnetically confined regions of
cool stars.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
13:25:11.60 -11:09:40.70 Spica (Alpha Vir) ACIS-S LETG 95.00
===================================================================================
Proposal Number: 05200722
Proposal Title: Looking for binaries in the oldest open clusters
PI: Maureen van den Berg
Subject Category: NORMAL STARS AND WD
Abstract: We propose to extend our study of close interacting binaries in old
open clusters by observing three of the oldest open clusters. Based on our
previous observations of old open clusters, we expect to detect a variety of
binaries (e.g. active binaries and cataclysmic variables) which we can use to
study subsequent stages of binary evolution. Also, these binaries provide
information on various types of stellar interactions (tidal interaction, mass
transfer, close encounters) in an open cluster. We want to compare the properties
of X-ray sources in old open clusters with those in denser globular clusters. Our
primary target, NGC6791, is one of the richest open clusters with an age (8-9
Gyr) close to that of globular clusters; no open cluster of this age has been
studied in X-rays before.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:20:53.00 +37:46:27.00 NGC6791 ACIS-S NONE 50.00
===================================================================================
Proposal Number: 05200774
Proposal Title: The young globular cluster Cygnus OB2
PI: Ettore Flaccomio
Subject Category: NORMAL STARS AND WD
Abstract: We propose to observe the candidate young globular cluster Cygnus OB2
for 100ksec with ACIS-I. This region has been found to contain about 2600 OB
stars, from which an even larger population of low mass stars is inferred. We
estimate that the proposed observation will detect about 2000 stars, putting
contraints on the cluster population above one solar mass. Moreover we expect to
detect hundreds of stars with shallow convective zones, whose X-ray emission will
be studied with unprecedented detail. The X-ray emission of these stars changes
abruptly during their evolution, and very few stars in this stage are found in
less rich regions. These data will provide important clues to the yet unclear
mechanism responsible for the X-ray emission of this class of stars and of PMS
stars in general.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
20:32:43.30 +41:20:34.00 Cygnus OB2 ACIS-I NONE 100.00
===================================================================================
Proposal Number: 05200810
Proposal Title: THE ENIGMA OF SYMMETRIC X-RAY PROFILES IN O STARS
PI: Derck Massa
Subject Category: NORMAL STARS AND WD
Abstract: We propose a 160 ks observation of the O7 III(n)(f) star Xi Per to
determine whether the unexpected symmetric X-ray line profiles observed in most O
stars by Chandra and XMM are due to the large spiral structures known to exist in
the winds of most O and B stars. Because we speculate that gaps between the
spiral structures allow X-rays to escape and produce the symmetric profiles and
since Xi Per is known to have such structures, we expect its mean X-ray spectrum
to have symmetric profiles. In addition, we will use the known period of its wind
variability to identify X-ray line profile variability. If detected, the
variability will constrain the location of the source of the X-rays and help
distinguish between alternative models for X-ray production.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
03:58:57.90 +35:47:27.70 Xi Per ACIS-S HETG 160.00
===================================================================================
Proposal Number: 05200662
Proposal Title: From Photosphere to Corona: Magnetic Fields and Coronal Emission
from the Active Binary CC Eridani
PI: RACHEL OSTEN
Subject Category: NORMAL STARS AND WD
Abstract: We propose to observe the active binary system CC Eridani at X-ray,
optical, and radio wavelengths to study the relationship between magnetic field
structure (observed in the photosphere and extrapolated into the corona), thermal
coronal emission, and the nonthermal electron distribution. A 135 ks Chandra
ACIS-S+HETGS observation will elucidate thermal coronal structure through use of
the differential emission measure, and trends of electron pressure with
temperature; 12 hours of VLA observations will investigate nonthermal coronal
structures. Simultaneous Zeeman Doppler Imaging using ground-based telescopes
determines the three dimensional structure of the photospheric field; potential
field extrapolations will test consistency with our radio/X-ray observations.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
02:34:22.60 -43:47:46.90 CC Eri ACIS-S HETG 135.00
===================================================================================
Proposal Number: 05200946
Proposal Title: Probing Colliding Winds and Magnetised Stars in Young,
Multipolar Planetary Nebulae
PI: Raghvendra Sahai
Subject Category: NORMAL STARS AND WD
Abstract: The biggest stumbling blocks to progress in understanding the death of
intermediate-mass stars and the accompanying formation of planetary nebulae
(PNs), are the complex stellar-wind episodes and the interactions between them
which occur during the post-AGB phase. We propose ACIS-S observations of 4
multipolar, young, PNs with very fast outflows for which optical emission-line
images are available, in order to directly probe the very hot (10$^{7-8}$K)
shocked gas resulting from the most recent wind-wind interactions in these
objects, as well as compact X-ray emission from the (possibly) magnetised central
stars. A comparative analysis of the X-ray and optical data on these PNs,
supplemented by detailed modelling, will be invaluable in solving the mystery of
how PNs are formed and shaped.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
10:07:01.80 -40:26:11.00 NGC3132 ACIS-S NONE 25.00
***********************************************************************************
WD BINARIES AND CV
--------------------------------------------------
===================================================================================
Proposal Number: 05300202
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.
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: 05300226
Proposal Title: The High Resolution X-ray Spectrum of AM Herculis: Probing the
Accretion Process
PI: Koji Mukai
Subject Category: WD BINARIES AND CV
Abstract: We propose a 100ks Chandra HETG observation of the polar AM Herculis in
a high state. With the good quality, high energy resolution data this will
provide, we will be able to use the HEG to: (i) examine the nature of the 6.4 keV
fluorescence line in order to see if it has its origin in reflection from the
white dwarf surface or absorption in the pre-shock flow. (ii) Measure the widths
of the thermal Fe Kalpha lines in order to constrain the importance of Compton
broadening in this star. Also, using the MEG we will be able to (iii) measure the
line strengths of the lighter elements and examine the physical conditions in the
post-shock region. [NOTE: This is a resubmission of an accepted Cycle 4 TOO
proposal, which has not been triggered as of March 5, 2003.]
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:16:13.30 +49:52:04.20 AM Herculis ACIS-S HETG 100.00
===================================================================================
Proposal Number: 05300266
Proposal Title: Continued Monitoring of the Orbital Evolution of RX J1914.4+2456
PI: TOD STROHMAYER
Subject Category: WD BINARIES AND CV
Abstract: We propose to continue monitoring the orbital evolution of RX
J1914.4+2456, a candidate double-degenerate binary with one of the shortest
orbital periods known. Previous ROSAT and ASCA data suggest that the orbit is
decaying at a rate consistent with gravitational wave losses. One of our approved
AO4 observations was performed recently. The data are superb and a preliminary
analysis has already reached some interesting conclusions. We find no evidence
for a 2nd periodicity which might be present if the system were an IP rather than
an ultracompact binary. The orbital frequency measured with Chandra supports the
earlier ephemeris derived from ROSAT and ASCA, however, the inferred frequency
derivative is higher, suggesting that the torque may be variable.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:14:26.10 +24:56:43.60 RX J1914.4+2456 ACIS-S NONE 15.00
19:14:26.10 +24:56:43.60 RX J1914.4+2456 ACIS-S NONE 15.00
19:14:26.10 +24:56:43.60 RX J1914.4+2456 ACIS-S NONE 15.00
19:14:26.10 +24:56:43.60 RX J1914.4+2456 ACIS-S NONE 15.00
19:14:26.10 +24:56:43.60 RX J1914.4+2456 ACIS-S NONE 15.00
19:14:26.10 +24:56:43.60 RX J1914.4+2456 ACIS-S NONE 15.00
===================================================================================
Proposal Number: 05300347
Proposal Title: Timing the Orbit of RX J0806.3+1527
PI: TOD STROHMAYER
Subject Category: WD BINARIES AND CV
Abstract: RX J0806.3+1527 is a likely double degenerate binary with the shortest
known orbital period (321 s). Past observations with ROSAT and Chandra have been
to sparse to enable any reliable constraints on the orbital evolution, which
should be detectable over the course of a year if the system is indeed
ultracompact. We propose a phase coherent timing campaign in order to explore the
gravitational radiation driven orbital evolution of the system. Our program will
enable long term monitoring of the orbital phase and will provide strong
constraints on the nature of the binary system and models for the X-ray emission
from this and similar sources.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
08:06:23.20 +15:27:30.20 RX J0806.3+1527 ACIS-S NONE 11.67
08:06:23.20 +15:27:30.20 RX J0806.3+1527 ACIS-S NONE 11.67
08:06:23.20 +15:27:30.20 RX J0806.3+1527 ACIS-S NONE 11.67
08:06:23.20 +15:27:30.20 RX J0806.3+1527 ACIS-S NONE 11.67
08:06:23.20 +15:27:30.20 RX J0806.3+1527 ACIS-S NONE 11.67
===================================================================================
Proposal Number: 05300581
Proposal Title: Mira AB - A Unique Laboratory for Wind Accretion Studies
PI: MARGARITA KAROVSKA
Subject Category: WD BINARIES AND CV
Abstract: We propose to study the accretion processes in the nearby Mira AB
system using Chandra's unprecedented sub-arcsecond resolution, and high
signal-to-noise spectra. Mira AB offers a unique laboratory for studying wind
accretion processes, a common phenomenon in many astronomical sources, because
the components of the system can be resolved and all of the important parameters
involved in wind accretion studies can be determined unambiguously from the
observations. Our principal goals are to obtain an accurate estimate of the X-ray
spatial and spectral energy distribution in the system, and to determine
accurately the flux of the X-ray source(s). These results will allow us to
calculate the total accretion luminosity, and to test and validate existing
accretion models.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
02:19:20.70 -02:58:27.80 MIRA AB ACIS-S NONE 70.00
===================================================================================
Proposal Number: 05300611
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. Numerical simulations with the
world's fastest computer will assist in the interpretation of our observational
data.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
01:03:14.30 -70:50:54.00 NGC 362 ACIS-S NONE 81.00
16:47:14.50 -01:56:52.00 NGC 6218 ACIS-S NONE 30.00
19:39:59.40 -30:57:44.00 NGC 6809 ACIS-S NONE 34.00
===================================================================================
Proposal Number: 05300642
Proposal Title: Multiwavelength Target of Opportunity Observations of One Bright
Nova in Outburst
PI: Sumner Starrfield
Subject Category: WD BINARIES AND CV
Abstract: We propose to obtain spectrophotometry with CHANDRA, plus ground based
optical and IR spectra of one bright nova in outburst. Our previous X-ray studies
have shown that X-rays are the best tool for studying the hot phases of the
outburst. In Cycle 1 we obtained grating spectra of V382 Vel and V1494 Aql. V382
Vel showed only emission lines while V1494 showed a spectrum resembling those of
the Super Soft X-ray Sources (suggested as SN Ia progenitors). These spectra
allowed us to study the composition of the underlying white dwarf, the lifetime
of the TNR phase of the outburst, and the energy budget of the explosion. More
data on one more nova is necessary since the behavior of these two novae was so
different, as expected from theory.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
NOVA TOO HRC-S LETG 25.00
NOVA TOO HRC-S LETG 25.00
NOVA TOO ACIS-S NONE 5.00
===================================================================================
Proposal Number: 05300731
Proposal Title: Understanding the nature of supersoft X-ray sources
PI: JOCHEN GREINER
Subject Category: WD BINARIES AND CV
Abstract: We propose to observe several supersoft X-ray sources (SSS) in the
Magellanic Clouds and M31 to (1) test the emission geometry in two short-period
binaries, particularly in 1E 0035.4--7230 which seemingly shows X-ray eclipses
whereas models suggest that the WD is hidden behind the flared accretion disk,
(2) investigate two newly discovered SSS in detail in order to establish their
nature, and (3) to investigate the large time variability of ROSAT-detected SSS
in order to understand their duty cycle and the mechanism causing these
variations.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
00:37:19.80 -72:14:13.00 1E 0035.4-7230 ACIS-S NONE 40.00
00:41:49.20 +40:56:43.00 M31-0041.7+4056 ACIS-S NONE 50.00
00:46:05.70 +41:43:04.00 M31-0046.0+4143 ACIS-S NONE 50.00
00:58:35.80 -71:46:02.00 RXJ 0058.6-7146 ACIS-S NONE 10.00
05:27:49.90 -69:54:09.00 RXJ 0527.8-6954 ACIS-S NONE 10.00
05:37:43.00 -70:34:15.00 RXJ 0537.7-7034 ACIS-S NONE 32.00
05:50:00.20 -51:52:09.00 RXJ 0550.0-7151 ACIS-S NONE 10.00
===================================================================================
Proposal Number: 05300762
Proposal Title: The Supersoft Source 1E1339.8+2837 and Globular Cluster M3
PI: Jonathan Grindlay
Subject Category: WD BINARIES AND CV
Abstract: We propose three 30 ksec Chandra ACIS-S observations (and three
near-simultaneous HST ACS orbits) to study the unique highly variable supersoft
source 1E1339.8+2837 in the globular cluster M3, measuring its spectrum, X-ray
and optical variability over timescales from minutes to a year. These
observations will be critical for understanding the accretion flow onto this
supersoft source. We also will perform a deep study of the populations of
cataclysmic variables, active binaries, and millisecond pulsars expected in M3,
increasing our understanding of how globular cluster parameters influence the
formation, destruction, and attributes of binary systems.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
13:42:11.20 +28:22:32.00 M3 ACIS-S NONE 10.00
13:42:11.20 +28:22:32.00 M3 ACIS-S NONE 10.00
13:42:11.20 +28:22:32.00 M3 ACIS-S NONE 10.00
===================================================================================
Proposal Number: 05300781
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 one of most recently
identified classes of jet-producing objects, are promising observational targets.
The first X-ray observation of an SS jet - a Chandra observation of R Aqr -
revealed X-ray structure even more extended than the radio jets, from
shock-heated gas out of thermal equilibrium. 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.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
Transient Symbiotic- ACIS-S NONE 80.00
===================================================================================
Proposal Number: 05300865
Proposal Title: X-ray jets in Symbiotics Stars
PI: Edwin Kellogg
Subject Category: WD BINARIES AND CV
Abstract: We propose to re-observe R Aqr to look for evolution of the jet, which
is highly time variable in radio. We hope to study further the unusual
fluorescence x-rays coming from the central region, as well. We also propose to
observe five of the brightest known symbiotic x-ray sources, searching for x-ray
jets and spectral features. Our goal is to understand the nature of the compact
objects in these systems, and the mechanisms by which they accrete and eject
energy and matter in jets and disks. Many of these systems are of special
interest because they are likely SN Ia progenitors,
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
23:43:49.50 -15:17:04.20 R Aqr ACIS-S NONE 40.00
===================================================================================
Proposal Number: 05301004
Proposal Title: Galactic Bulge Deep Survey
PI: Jonathan Grindlay
Subject Category: WD BINARIES AND CV
Abstract: We propose a deep survey in the second lowest extinction (after Baades
Window) region in the galactic bulge, the window identified by Stanek (1998) at
l,b ~ 0.25, -2.1. This will complement our deep survey of Baades Window scheduled
for cycle 4 and allow comparative source populations, and constraints on the
gradient towards the galactic center, to be derived. HST orbits (9) are requested
to do the optical identifications in this field down to Mv ~9, sufficient to
identify most CVs and qLMXBs. This will constrain the compact object populations
in the galactic bulge.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:54:40.80 -29:49:32.00 Stanek window ACIS-I NONE 100.00
***********************************************************************************
BH AND NS BINARIES
--------------------------------------------------
===================================================================================
Proposal Number: 05400021
Proposal Title: Low-luminosity X-ray binaries
PI: Mariano Mendez
Subject Category: BH AND NS BINARIES
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:08:54.40 -32:18:57.00 1RXS J170854.4-32185 ACIS-S NONE 15.00
17:18:24.30 -40:29:34.00 RXJ1718.4-4029 ACIS-S NONE 15.00
17:54:28.30 -26:20:35.00 1RXS J175428.3-26203 ACIS-S NONE 20.00
===================================================================================
Proposal Number: 05400023
Proposal Title: High inclination X-ray binaries
PI: Mariano Mendez
Subject Category: BH AND NS BINARIES
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:50:45.50 -31:17:32.00 GRS 1747-312 ACIS-S HETG 50.00
===================================================================================
Proposal Number: 05400034
Proposal Title: The Winds of Warps
PI: Claude Canizares
Subject Category: BH AND NS BINARIES
Abstract: Optical observations demonstrate that the low mass X-ray binary 4U
1957+11 is a nearly edge-on source. The changing morphology of the optical
lightcurve, along with long term (hundreds of days) quasi-periods detected in the
X-ray, strongly suggest that 4U 1957+11 exhibits a warped, precessing accretion
disk and/or a wind-driven limit cycle. We will use Chandra-HETG to search for
signatures of a photoionized atmosphere, determine whether any such atmosphere
constitutes a wind sufficiently strong to lead to the observed super-orbital
optical and X-ray variability, and study the elemental abundances and structure
of the nearly edge-on disk. We are requesting a 67 ksec observation with HETG,
i.e., two full binary periods of this potential black hole binary system.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:59:23.90 +11:42:30.00 4U 1957+11 (=V1408 A ACIS-S HETG 67.00
===================================================================================
Proposal Number: 05400189
Proposal Title: Precise Localization of GRO J2058+42
PI: C. Wilson
Subject Category: BH AND NS BINARIES
Abstract: We propose to precisely locate the probable Be/X-ray binary GRO
J2058+42 by observing it at the outburst phase of its binary orbit with ACIS-I.
The HETG will be inserted to reduce pile-up in the zeroth order image and to
obtain a spectrum, including a measure of column density. We will use proven
techniques to precisely locate the source, regardless of pile-up. GRO J2058+42
has been regularly active since 1995, unlike most Be/X-ray binaries which undergo
short series of outbursts. Determining an optical counterpart is especially
important for GRO J2058+42 because its long-term X-ray activity makes it an
optimal candidate for future multi-wavelength studies of the interactions between
the Be star and neutron star, which are crucial to understanding these systems.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
20:59:00.00 +41:43:00.00 GRO J2058+42 ACIS-I HETG 10.00
===================================================================================
Proposal Number: 05400238
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 3 observations of a BHC 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 BHC SXTs extends to X-ray flux levels a factor of 1000 lower. If
this relation holds this may explain the fact that the BHC 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 BHC SXT at scarcely studied
luminosity intervals. These spectra can be compared with sources discovered
serendipitously (eg in surveys); perhaps these are stably accreting BHCs at low M
dot.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
NN ACIS-S NONE 10.00
NN ACIS-S NONE 20.00
NN ACIS-S NONE 40.00
===================================================================================
Proposal Number: 05400245
Proposal Title: 1WGA J1346.5-6255: A New High-Mass Microquasar?
PI: Yousaf Butt
Subject Category: BH AND NS BINARIES
Abstract: 1WGA J1346.5-6255 is a marginally-extended ROSAT source coincident with
the O-type star HD 119682. We have analyzed 35 ksec of recent XMM EPIC-PN
archival data on this object and find that the spectrum is best-fit with a
power-law with photon index ~1.7. Although some O stars are known to be X-ray
emitters, their spectra are thermal in nature. The non-thermal spectrum of 1WGA
J1346.5-6255 may point to a new High Mass X-ray Binary (HMXB) microquasar, such
as was found for the case of the persistent HMXB microquasar LS 5039 (which also
has an O-star companion). 1WGA J1346.5-6255 is embedded in a bipolar radio shell,
similar to that of SS433/W50, and is intrinsically extended along the axis of the
bipolar shell. We would like to image any jets/outflows which may explain the
extension.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
13:46:32.30 -62:55:30.00 1WGA J1346.5-6255 ACIS-S NONE 15.00
===================================================================================
Proposal Number: 05400252
Proposal Title: Monitoring the ultraluminous x-ray source in NGC 5408
PI: Philip Kaaret
Subject Category: BH AND NS BINARIES
Abstract: The ultraluminous x-ray sources (ULXs) may be stellar-mass black holes
with beamed radiation or unbeamed intermediate-mass black holes. We found radio
emission from a ULX in the dwarf irregular galaxy NGC 5408. The x-ray, radio, and
optical properties are consistent with beamed relativistic jet emission from a
stellar-mass black hole. We propose to monitor the source with simultaneous
observations with Chandra and the VLA. If the x-ray emission is inverse-Compton
emission from a jet, then the x-ray and radio properties should be coupled.
Demonstration of a robust correlation between the x-ray and radio emission would
be strong evidence in favor of the beamed microquasar interpretation.
Uncorrelated variations in the two bands would rule out the beamed microquasar
interpretation.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
14:03:19.60 -41:22:58.70 NGC 5408 ULX ACIS-S NONE 5.00
14:03:19.60 -41:22:58.70 NGC 5408 ULX ACIS-S NONE 5.00
14:03:19.60 -41:22:58.70 NGC 5408 ULX ACIS-S NONE 5.00
14:03:19.60 -41:22:58.70 NGC 5408 ULX ACIS-S NONE 5.00
===================================================================================
Proposal Number: 05400390
Proposal Title: The Near Eddington Neutron Star 4U 1624-460: A Probe of Disk,
Wind, and ISM structure
PI: Julia Lee
Subject Category: BH AND NS BINARIES
Abstract: We propose a 76~ks (one complete orbital cycle) Chandra-HETGS
observation of the dipping X-ray binary 4U~1624--490. This long observation will
provide a much more complete picture of 4U~1624--490 by allowing us to (1) probe
the accretion flow and accretion disk corona via emission and absorption line
spectroscopy, (2) study the disk composition and to test partial covering models
via binary orbital phase-resolved edge spectroscopy, (3) look for and assess dust
features, and (4) measure and model the (variable) dust scattering halo. The full
76~ks is necessary for adequately resolving subtle spectral features, and
tracking variability in the dust scattering halo.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
16:28:02.40 -49:11:25.10 4U 1624-49 ACIS-S HETG 76.00
===================================================================================
Proposal Number: 05400403
Proposal Title: Chandra follow-up of very hard transient sources detected with
INTEGRAL
PI: Sergio Campana
Subject Category: BH AND NS BINARIES
Abstract: INTEGRAL is detecting new, highly absorbed, transient sources that are
unaccessible to RXTE/ASM detections. A clear assessment of the nature of these
transients has not been gathered yet. These might be hard X-ray transients,
systems similar to CI Cam or highly absorbed soft X-ray transients hosting a
neutron star or a black hole. The present proposal aims at exploring in detail
the nature of INTEGRAL transients. The HETG spectral resolution and ACIS-I superb
image quality make this program unique for studying in detail the iron line
complex and the presence of jets in these sources. We require the observations of
two INTEGRAL transients with a monitoring program to follow them from outburst to
quiescence.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
INTEGRAL TOO1 ACIS-S HETG 10.00
===================================================================================
Proposal Number: 05400417
Proposal Title: Chandra observations of accretion-driven millisecond X-ray
pulsars in quiescence
PI: Rudy Wijnands
Subject Category: BH AND NS BINARIES
Abstract: We propose observations of the most recently discovered
accretion-driven millisecond X-ray pulsars when they are in quiescence. Our
observations will elucidate the reason(s) behind the enigmatic quiescent
properties of SAX J1808.4-3658, which so far is the only accretion driven
millisecond X-ray pulsar detected and studied in quiescence. We will be able to
determine whether SAX J1808.4-3658 has unique quiescent properties (caused by
some unique feature) or whether its behaviour is a common property of millisecond
X-ray pulsars. In the former case, we expect the quiescent properties of our
targets to be similar to the majority of quiescent neutron stars. In the latter
case, we expect our targets to have a low quiescent X-ray luminosity (<10^{32}
ergs/s) and hard, power-law shaped spectra.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
09:29:20.10 -31:23:04.30 XTE J0929-314 ACIS-S NONE 25.00
17:51:13.50 -30:37:23.40 XTE J1751-305 ACIS-S NONE 50.00
===================================================================================
Proposal Number: 05400399
Proposal Title: An ACIS-HETGS TOO of the microquasar XTE J1748-288
PI: Julia Lee
Subject Category: BH AND NS BINARIES
Abstract: We propose a 140ks HETGS TOO, separated into any combination of the
previously observed very high (30~ks), high~(40~ks), and low~(70~ks) states in
the microquasar XTE J1748-288 in order to characterize its spectral behavior
during these phases. We will look for and resolve narrow absorption/emission
features expected from the disk atmosphere or P-Cygni profiles indicative of a
wind, and track the behavior of the strong Fe K-alpha emission which may be
relativistic. Observations during the low state may give us the best opportunity
for obtaining spectra, and possibly 0th order X-ray image of a relativistic jet
in a microquasar. The proposed time was awarded to this proposal in Chandra
cycles AO2 and AO3 -- the source has remained off.
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
===================================================================================
Proposal Number: 05400420
Proposal Title: The large-scale relativistic jet and low-luminosity spectrum of
GX 339-4
PI: Rob Fender
Subject Category: BH AND NS BINARIES
Abstract: Despite more than 30 years of study, relativistic jets from AGN and
galactic microquasars are not well understood. Recently, Chandra observations of
X-ray jets from AGN have advanced considerably our knowledge of jet physics on
large scales. Spectacular Chandra observations of the black hole candidate (BHC)
XTE J1550-564 revealed a moving, decelerating, X-ray jet resulting from an
ejection event four years earlier, and accelerating electrons in situ to TeV
energies. We have radio evidence for a similar sequence of events from the
long-term BHC GX 339-4, in which a 5-10 arcsec jet has been formed following a
major ejection in 2002 May, and a further ejection event seems to be underway. We
request Chandra imaging to perform a morphological, spectral and time-variability
study of this jet.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:02:49.40 -48:47:23.30 GX 339-4 ACIS-S NONE 30.00
17:02:49.40 -48:47:23.30 GX 339-4 ACIS-S NONE 30.00
17:02:49.40 -48:47:23.30 GX 339-4 ACIS-S NONE 30.00
===================================================================================
Proposal Number: 05400437
Proposal Title: High Resolution Spectroscopy of GX 17+2 with the Chandra/HETG
PI: Tiziana Di Salvo
Subject Category: BH AND NS BINARIES
Abstract: We propose Chandra HETGS observations of the Z source GX 17+2 for 30
ks, to perform a detailed study of the iron K-shell features and other low energy
features in this source. In particular these sources are known to show broad (~1
keV FWHM) iron Kalpha lines: several hypothesis were proposed to explain their
width (e.g. relativistic and Doppler effects in an accretion disk, Compton
scattering, line-blending), and we expect that the high energy resolution
(actually the highest in the iron Kalpha line range) of Chandra HETGS will be
able to resolve the complex line shape and to constrain the various models
proposed.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:16:01.40 -14:02:11.00 GX 17+2 ACIS-S HETG 30.00
===================================================================================
Proposal Number: 05400416
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 from the microquasar XTE J1550-564 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 25.00
X-ray Jets ACIS-S NONE 30.00
X-ray Jets ACIS-S NONE 40.00
===================================================================================
Proposal Number: 05400500
Proposal Title: Resolving Relativistic Effects and the Accretion Flow Geometry
of a Black Hole in Outburst
PI: Jon Miller
Subject Category: BH AND NS BINARIES
Abstract: We propose to study the accretion flow geometry of a Galactic black
hole in outburst using the Chandra HETGS. Models for the accretion flow geometry
in Galactic black holes make different predictions which can be tested with high
resolution spectroscopy. We will build on the recent successes of this program --
including the detection of broad Fe K lines likely shaped by Doppler shifts and
strong gravity, and narrow absorption lines in an outflowing disk atmosphere --
by obtaining spectra with improved sensitivity. We request a total of 200 ksec (4
obs. of 50 ksec; 1 ``fast'' TOO and 3 follow-ups) for this Chandra study. We will
support these observations with simultaneous RXTE and Integral observations, and
with radio, IR, and optical observations from approved programs around the
globe.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
Black Hole Transient ACIS-S HETG 50.00
Black Hole Transient ACIS-S HETG 50.00
Black Hole Transient ACIS-S HETG 50.00
Black Hole Transient ACIS-S HETG 50.00
===================================================================================
Proposal Number: 05400515
Proposal Title: A High Resolution X-ray Spectroscopic Investigation of AC211
PI: Nicholas White
Subject Category: BH AND NS BINARIES
Abstract: The source AC211 in the globular cluster M15 is viewed close to the
orbital plane with the central X-ray source hidden behind an Accretion Disk
Corona (ADC). We propose to make a Chandra HETG observation of this source to
investigate the structure of the accretion flow and the emission properties of
the ADC. The high spectral resolution of the HETG is ideally suited to probe the
photo-ionized plasma in the vicinity of the X-ray source. To avoid contamination
from a nearby bright Low mass X-ray binary in M15 (2.7 arc sec away) this
observation must be performed at a constrained roll angle. As a free bonus this
observation will also provide an excellent high resolution spectrum of this
second source.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
21:29:58.30 +12:10:09.00 AC211 ACIS-S HETG 60.00
===================================================================================
Proposal Number: 05400594
Proposal Title: High Resolution Photospheric Spectroscopy of the Neutron Star in
EXO0748-676
PI: Frederik Paerels
Subject Category: BH AND NS BINARIES
Abstract: Recently, we discovered narrow absorption features in the spectrum of
28 X-ray bursts from the neutron star in the LMXB EXO0748-676, whose properties
point to a photospheric origin. The transition wavelengths are consistent with
the n=2-3 lines in H- and He-like Fe, exhibiting a gravitational redshift of
z=0.35. The measured line strengths indicate that the lines are significantly
broadened by the Stark effect, and this will ultimately provide an opportunity to
determine both the mass and the radius of this neutron star. Here we propose a
very deep spectroscopic observation with Chandra HETGS, to detect the Fe Lyman
spectrum and obtain crucial independent spectroscopic confirmation for the Balmer
line identification, and to measure the spin period of the neutron star.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
07:48:33.30 -67:45:00.00 EXO 0748-676 ACIS-S HETG 130.00
07:48:33.30 -67:45:00.00 EXO 0748-676 ACIS-S HETG 170.00
===================================================================================
Proposal Number: 05400602
Proposal Title: High Resolution Spectroscopy of LMC X-3: Probing Local Hot X-ray
Absorbing Gas
PI: Taotao Fang
Subject Category: BH AND NS BINARIES
Abstract: We propose to observe LMC X-3 in high state for 100 ksec with the
Chandra LETG-HRC-S. The primary goal is to study the absorption from the hot
intervening gas with unprecedented high quality spectrum. We will for the first
time provide measurement of the hot gas either in or nearby the Milk Way. This is
important for the study of hot gas properties both in our Galaxy and in the Local
Group space. We will also examine the intrinsic properties of the low mass X-ray
binary. The obseration will be triggered when LMC X-3 enters the high/soft state,
which will be monitored by the Rossi-XTE ASM. This will guarantee an excellent
high quality spectrum containing nearly 1 million photons in the first order,
allowing for detection of OVII absorption line with a column density as low as
1E15 cm^-2.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:38:56.30 -64:05:03.00 LMC X-3 HRC-S LETG 100.00
===================================================================================
Proposal Number: 05400605
Proposal Title: The Spectral Energy Distribution of Cen X-4
PI: Michael Garcia
Subject Category: BH AND NS BINARIES
Abstract: We propose to obtain the first high-quality, wide-band spectral energy
distribution (SED) of the neutron star X-ray nova Cen X-4 in quiescence. We will
compare this SED to those we have previously obtained for black hole X-ray novae
(BHXN) in quiescence. Our previous comparisons of SEDs have been very powerful in
revealing the nature of these exotic objects; for example they have revealed the
best evidence yet for the existence of event horizons. These wide-band, high
quality SEDs have revealed the presence of ADAFs in BHXN, and are revealing the
presence of winds (ADIOS) and/or convection (CDAFs) in these flows. Previous SEDs
of Cen X-4 have suffered from non-simultaneity and have not included the FUV,
where the emission may well peak.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
14:58:22.00 -31:40:07.50 Cen X-4 ACIS-S NONE 11.00
===================================================================================
Proposal Number: 05400633
Proposal Title: Finding Black Holes and Understanding Star Cluster Evolution
with Chandra
PI: Simon Portegies Zwart
Subject Category: BH AND NS BINARIES
Abstract: Recent theoretical models predict that young, massive star clusters of
the type we propose to observe should be unusually rich in black-hole X-ray
binaries (BHXBs); they are at an age when BHs have formed but have not yet been
expelled. We observed one such clusters in the last cycle; amazingly, no X-ray
sources were detected down to 1.5 times 10^{32} erg/s (we expected ~5-10
sources). This could signal a statistical fluke or a need for significant change
to our current understanding of star cluster evolution as well as our
understanding of the formation and evolution of BHXBs. We propose to observe five
more clusters (in two observations) to further explore this exciting topic.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:53:17.00 -69:31:42.00 NGC 2136/7 ACIS-S NONE 40.00
===================================================================================
Proposal Number: 05400648
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 6 Chandra slow TOO observations on
new sources discovered by the INTEGRAL Observatory. We ask for 20 ksecs per
observation, using HETGS. The scientific aim is to determine the source position
with the 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.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
new INTEGRAL source ACIS-S HETG 20.00
===================================================================================
Proposal Number: 05400673
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, which will set 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: 05400763
Proposal Title: Resolving X-ray Jets in GRS 1915+105 with Chandra
PI: Jon Miller
Subject Category: BH AND NS BINARIES
Abstract: The Galactic microquasar GRS 1915+105 has been active in the X-ray and
radio bands for more than 10 years. The ejection of blobs of matter at
relativistic velocities is frequently observed on milli-arcsecond scales in radio
bands, yet jets have never been imaged on scales larger than an arcsecond. The
detection of X-ray jets in XTE J1550-564 has shown that radio and X-ray fluxes do
not always correlate. We have designed an observing scheme which can resolve
X-ray jets within 5'' of the central source in just 30 ksec without risk to the
ACIS-S array. This observation will also constrain dust scattering halo models,
and probe the emerging black hole spin -- relativistic jet paradigm.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:15:11.50 +10:56:44.00 GRS 1915+105 ACIS-S NONE 30.00
===================================================================================
Proposal Number: 05400850
Proposal Title: Localizing the X-Ray Transient 4U 1730-22
PI: John Tomsick
Subject Category: BH AND NS BINARIES
Abstract: We propose a 40 ks Chandra/ACIS-S observation to localize the
historical X-ray transient 4U 1730-22 in order to facilitate an optical
identification and measure the quiescent X-ray flux. This source was discovered
in 1972, but has not been detected in outburst for over 30 years. Although it is
clear that it is a transient X-ray binary, it is unclear if it contains a neutron
star or a black hole. Due to the relatively low column density along the line of
sight, an identification is likely to allow us to perform follow-up optical and
IR observations to provide a measurement of the compact object mass and the
distance to the source.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:33:57.00 -22:02:07.00 4U 1730-22 ACIS-S NONE 40.00
===================================================================================
Proposal Number: 05400958
Proposal Title: HETGS Spectroscopy of the Ultracompact X-ray Dipper 4U 1916-05
PI: Deepto Chakrabarty
Subject Category: BH AND NS BINARIES
Abstract: We propose to observe the ultracompact, 50-min X-ray dipper 4U 1916-05.
The class of X-ray dippers have shown a number of X-ray emission and absorption
features that can constrain the nature of the emission regions. Our analysis of
the ASCA spectrum of 4U 1916-05 shows a soft excess, possibly attributable to Ne
and Mg line emission. Chandra/HETGS spectroscopy of 4U 1916-05 will resolve these
line features and allow us to probe the accretion disk structure, including
temperature, density, and geometry, as well as constrain the composition of the
donor.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:18:48.00 -05:14:08.60 4U 1916-05 ACIS-S HETG 50.00
===================================================================================
Proposal Number: 05401007
Proposal Title: Using the Intensity Dips in Hercules X-1 to Probe the Inner
Accretion Disk
PI: Mario Jimenez-Garate
Subject Category: BH AND NS BINARIES
Abstract: We propose to obtain HETGS spectra of the pre-eclipse dips in Hercules
X-1, to probe the ionization structure of the inner disk which is not visible at
other times. We expect to detect broad emission lines during dips, which will
enable a direct comparison with the narrow line spectrum observed in the low
state. This comparison will establish whether the differences between dippers and
accretion disk corona (ADC) sources are due exclusively to an inclination
dependence. Numerous spectroscopic diagnostics will probe the temperature,
density, kinematics and emission measure of the plasma.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
16:57:49.80 +35:20:32.60 Her X-1 ACIS-S HETG 66.00
===================================================================================
Proposal Number: 05401015
Proposal Title: The Evolution of the fossil Jets associated with 4U1755-33
PI: Lorella Angelini
Subject Category: BH AND NS BINARIES
Abstract: 4U1755-33 had been a bright persistent source for at least 25 yrs, but
in 1995 entered an extended quiescent phase. An XMM-Newton observation of
4U1755-33, made to study the quiscence emission, reveals the presence of a narrow
$7'$ long X-ray jet-like feature centered on the position of 4U1755-33. This is
the second LMXRB that shows evidence of an X-ray ray jet. We propose to use the
high angular resolution of Chandra to study the jet morphology and evolution with
time. This observation will also place a factor of 10 improved upper limit on the
quiscence emission of 4U1755-33, and place further constraints on whether or not
this system contains a black hole.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:58:40.00 -33:48:27.00 4U1755-33 ACIS-S NONE 50.00
===================================================================================
Proposal Number: 05400884
Proposal Title: Probe the relativistic Out-flow in the microquasar GRS1915+105
with HETG/Chandra
PI: Yuxin Feng
Subject Category: BH AND NS BINARIES
Abstract: In the microquasar GRS 1915+105, radio and X-ray flares have been found
to be correlated in some episodes. The radio jet forms during the plateau flare.
In 1998 during a radio/X-ray flare, the blue shifted absorption lines were
observed with ASCA, which indicates a strong jet/out-flow, which enables us to
probe the velocity and density distribution of the jet/out-flow. We propose to
monitor the microquasar GRS 1915+105 with ACIS-S/HETG. The observation will
provide the first detailed X-ray spectroscopy data on GRS 1915+105 during a
correlated radio/X-ray flare and also allow us to study the correlation between
the properties of the the jet and those of the accretion disk.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:15:11.60 +10:56:44.90 GRS 1915+105 ACIS-S HETG 30.00
19:15:11.60 +10:56:44.90 GRS 1915+105 ACIS-S HETG 30.00
19:15:11.60 +10:56:44.90 GRS 1915+105 ACIS-S HETG 30.00
===================================================================================
Proposal Number: 05401053
Proposal Title: The Low-luminosity X-ray binary EXO 1912+097
PI: Mariano Mendez
Subject Category: BH AND NS BINARIES
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:13:58.80 +09:52:37.00 EXO 1912+097 ACIS-S NONE 20.00
***********************************************************************************
SN, SNR AND ISOLATED NS
--------------------------------------------------
===================================================================================
Proposal Number: 05500002
Proposal Title: A Chandra Search for Crab-like Supernova Remnants
PI: Stephen Murray
Subject Category: SN, SNR AND ISOLATED NS
Abstract: The number of currently known Crab-like neutron stars is far below that
expected from the Galactic supernova rate. Such neutron stars are likely to be
found in small-diameter supernova remnants. We propose observations of G351.2+0.1
and G341.9-0.3, two compact SNRs selected from the MOST Catalog, with the goal of
detecting new members of the young neutron star family. The 45 ks observations
will be sensitive to detection of the faintest currently known member of this
young class, even if located in the most distant spiral arms of the Galaxy.
Detections of Crab-like components will lead to more sensitive studies in the
radio and X-ray band in order to search for the young pulsars driving the
systems.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
16:54:50.00 -44:01:00.00 G341.9-0.3 ACIS-S NONE 45.00
17:22:28.00 -36:10:60.00 G351.2+0.1 ACIS-S NONE 45.00
===================================================================================
Proposal Number: 05500003
Proposal Title: FIRST EPOCH PROPER MOTION STUDIES OF YOUNG NEUTRON STARS IN
SUPERNOVA REMNANTS
PI: Stephen Murray
Subject Category: SN, SNR AND ISOLATED NS
Abstract: The initial period distribution of pulsars provides vital insight into
the processes taking place during the core collapse of a massive star. Proper
motion measurements of young pulsars in supernova remnants provide reasonably
robust estimates of pulsar ages which, combined with pulsar spin parameters,
allow us to estimate these sources' initial spin periods. As part of a
multi-wavelength program to build up the initial period distribution of pulsars,
we here propose first-epoch observations of two young pulsars in SNRs using
Chandra HRC. Subsequent observations five years hence will yield the motion of
these sources and hence their ages and initial periods. These HRC images will
provide no spectral information, and so are not in conflict with any ACIS
observations of these same sources.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
00:07:02.10 +73:02:59.00 WGA J000702+7302.9 HRC-I NONE 75.00
12:10:00.90 -52:26:27.00 PSR J1210-5226 HRC-I NONE 50.00
===================================================================================
Proposal Number: 05500008
Proposal Title: High Resolution investigation of a possible Cyclotron Absorption
Line in RBS1223
PI: PETER PREDEHL
Subject Category: SN, SNR AND ISOLATED NS
Abstract: High Resolution investigation of a possible Cyclotron Absorption Line
in RBS1223
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
13:08:48.30 +21:27:06.80 RBS1223 HRC-S LETG 100.00
===================================================================================
Proposal Number: 05500046
Proposal Title: Observation of SNR RCW103
PI: Gordon Garmire
Subject Category: SN, SNR AND ISOLATED NS
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
16:17:36.30 -51:02:25.00 RCW103 ACIS-I NONE 5.00
16:17:36.30 -51:02:25.00 RCW103 ACIS-I NONE 5.00
16:17:36.30 -51:02:25.00 RCW103 ACIS-I NONE 5.00
16:17:36.30 -51:02:25.00 RCW103 ACIS-I NONE 5.00
===================================================================================
Proposal Number: 05500054
Proposal Title: Center-filled Supernova Remnant G16.85-1.05 and its surroundings
PI: Gordon Garmire
Subject Category: SN, SNR AND ISOLATED NS
Abstract: In one pointing we will image 5 sources: an SNR, a microquasar, a
pulsar, an unidentified ASCA source and a Wolf-Rayet star. Our primary goal is to
resolve a pulsar-wind nebula in the SNR G16.85-1.05. As a by-product, we will
obtain a high quality spectrum of the microquasar LS 5039 and possibly detect
X-ray emission from the PSR J1825-1446.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:25:27.00 -14:48:38.00 SNR G16.85-1.05 ACIS-I NONE 30.00
===================================================================================
Proposal Number: 05500059
Proposal Title: Crab-Like Supernova Remnant G63.7+1.1
PI: Gordon Garmire
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose to observe a Crab-like Galactic SNR G63.7+1.1 with the
Chandra/ACIS. Our goal is to detect the centrally-peaked (in radio) region in
X-rays, to determine spectral characteristics of the X-ray emission, and possibly
to resolve embedded neutron star.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:48:02.50 +27:43:60.00 G63.7+1.1 ACIS-S NONE 30.00
===================================================================================
Proposal Number: 05500071
Proposal Title: Snapshot Observation of two Recently Discovered Radio Pulsars
PI: Gordon Garmire
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose a series of snapshot observations of four radio pulsars
discovered during the Parkes Multibeam Pulsar Survey. The goal of these
observations is to measure the pulsar X-ray fluxes and to look for evidence of
any extended emission.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
07:29:16.50 -14:48:36.80 PSR J0729-1448 ACIS-S NONE 4.00
17:02:52.50 -41:28:48.20 PSR J1702-4128 ACIS-S NONE 10.00
===================================================================================
Proposal Number: 05500083
Proposal Title: Was the X-ray Afterglow of GRB 970815 Detected, or is 3EG
J1621+8203 a Pulsar?
PI: Nestor Mirabal
Subject Category: SN, SNR AND ISOLATED NS
Abstract: One of the gamma-ray bursts localized by the RXTE ASM was followed by
ASCA and ROSAT HRI pointings. While an X-ray source was detected just outside the
ASM error box, it was never associated with the GRB because it was not clearly
fading and because no optical afterglow was found. Years later, while attempting
to identify an EGRET source whose error ellipse includes the position of GRB
970815, we made deep optical observations of the ASCA and ROSAT source position,
which is still blank to a limit V > 24.4. We need a brief Chandra observation to
see if the X-ray source is persistent. If not, it was almost certainly the X-ray
afterglow of the optically "dark" GRB. If still present, it may be an "off-beam"
pulsar counterpart of an EGRET source, and an important target for further
study.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
16:06:52.00 +81:30:28.00 RX J1606.8+8130 ACIS-S NONE 10.00
===================================================================================
Proposal Number: 05500097
Proposal Title: Alt: Chandra Observations of the Anomalous X-ray Pulsar RX
J1708-4009
PI: Gordon Garmire
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose an observation of the Anomalous X-ray Pulsar RX J1708-4009
with ACIS-S3 in the continuous clocking mode to perform pulse-phase-resolved
spectroscopy and energy-resolved timing.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:08:46.90 -40:08:52.50 RX J1708-4009 ACIS-S NONE 30.00
===================================================================================
Proposal Number: 05500106
Proposal Title: THE NEXT GEMINGA: TAKING THE PULSE OF THE EGRET SOURCE 3EG
J1835+5918
PI: Jules Halpern
Subject Category: SN, SNR AND ISOLATED NS
Abstract: 3EG J1835+5918 is the brightest of the so-called unidentified EGRET
sources at high Galactic latitude, (l,b)=(89,+25). We obtained Chandra, HST, and
radio observations that definitively demonstrate the presence of an isolated,
radio-quiet neutron star in the error box that is the only plausible
identification of the EGRET source. 3EG J1835+5918 may thus be the prototype of
an hypothesized population of older pulsars, born in the Gould belt, that can
account for as many as 40 local EGRET sources. This proposal offers the possible
culmination of the search for this, the next "Geminga", by discovering its
pulsations, which is necessary to determine its age and energetics, as well as to
prove the identification with the gamma-ray source.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:36:13.70 +59:25:30.10 3EG J1835+5918 HRC-S NONE 130.00
===================================================================================
Proposal Number: 05500128
Proposal Title: Thermal Emission from the Crab Nebula
PI: Frederick Seward
Subject Category: SN, SNR AND ISOLATED NS
Abstract: A Cycle 3 observation to search for an outer shock shows nothing
outside the visible Crab. There is, however, evidence for soft emission from the
northern edge of the 5' X 7' optical nebula, which was just inside the ACIS field
of view. This proposal is to observe the entire outer 2' of the 5' X 7' nebula
with a sensitivity 10X greater than in previous Chandra observations. It is an
exploration of a region not yet really observed (in X-rays) and requires great
care to set up so the bright central source does not overwhelm the telemetry. The
high spectral resolution of Chandra is essential and the time required modest.
The result will be a map of the outer part of the PWN and should also locate
additional mass within the Nebula.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:34:32.00 +22:00:52.00 Crab Nebula ACIS-S NONE 40.00
===================================================================================
Proposal Number: 05500139
Proposal Title: The Wind Torus of PSR B1706-44
PI: ROGER ROMANI
Subject Category: SN, SNR AND ISOLATED NS
Abstract: The alignment of the projected linear and angular momentum vectors
found by CXO for the Crab and Vela pulsars points the way to a new probe of
neutron star formation and core collapse and by extension new constraints on
fundamental physics. Further examples are needed to establish significance and
test parameter dependence -- these require images resolving the equatorial tori
in pulsar wind nebulae. We identify a (rare) suitable torus around the Gamma-ray
pulsar B1706-44 in archival CXO data and propose ACIS imaging exposures that will
map the PWN geometry and should allow a high precision test of spin and kick
alignment. These observations are of independent interest for this important PWN
and also provide useful spectral constraints on the pulsar itself.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:09:42.70 -44:29:06.60 PSR B1706-44 ACIS-I NONE 100.00
===================================================================================
Proposal Number: 05500248
Proposal Title: X-ray Emission from a Type Ia Supernova
PI: Eric Schlegel
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose to observe a Type Ia supernova as close to the outburst as
possible. We will test whether Type Ia supernovae possess a circumstellar medium
at outburst. If a nearby Type Ia does have a circumstellar medium, it will be the
first such detection. X-ray emission from a Type Ia supernova must be present if
models of binary evolution are correct.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
Type Ia SN ACIS-S NONE 15.00
Type Ia SN ACIS-S NONE 15.00
===================================================================================
Proposal Number: 05500255
Proposal Title: Completing our understanding of RCW 86 with Chandra imaging and
XMM-Newton high resolution spectroscopy
PI: Jacco Vink
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose to complete the mapping of the SNR RCW 86 with two
observations of the northern shell with both Chandra and XMM-Newton. RCW 86 is a
convincing example of a remnant in an ISM cavity, and it is one of the few shell
type remnants with X-ray synchrotron radiation. A peculiarity is that the
synchrotron emission seems associated with Fe K emission at 6.4 keV, which is
likely to come from a low density pure Fe plasma, suggesting other pure metal
ejecta may also be present. The proposed observations will map the only part of
the main shell with synchrotron radiation, an interesting break-out structure,
and a faint outer shell. Chandra will provide detailed imaging spectroscopy,
supplemented by XMM, which in addition provides high resolution spectroscopy with
the RGS.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
14:45:02.30 -62:20:32.00 RCW 86 NE ACIS-S NONE 75.00
===================================================================================
Proposal Number: 05500321
Proposal Title: MEASURING NEUTRON STAR RECOIL FROM A SUPERNOVA: A UNIQUE
OPPORTUNITY IN PUPPIS A
PI: P. WINKLER
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose a second HRC-I imaging observation of the radio-quiet pulsar
RXJ0822-4300, located near the center of the Puppis A supernova remnant. The
distribution of ejecta-rich optical filaments in Puppis A suggests that this
pulsar may be recoiling at about 100 mas/yr, as a result of an asymmetry in the
core-collapse supernova that produced both Puppis A and the pulsar some 3700 yr
ago. The proposed second-epoch image will be compared with a near identical
observation from Dec 1999, in order to measure the pulsar proper motion. If
successful, Puppis A will become the first SNR where both asymmetric ejecta and
recoil of a compact central source have been directly measured, providing
incontrovertible evidence that at least some core-collapse supernovae are
asymmetric.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
08:21:57.50 -43:00:15.70 RXJ0822-4300 HRC-I NONE 40.00
===================================================================================
Proposal Number: 05500466
Proposal Title: Monitoring Circumstellar Interaction in SN 1986J
PI: John Houck
Subject Category: SN, SNR AND ISOLATED NS
Abstract: SN1986J ranks as one of the most luminous, X-ray bright supernovae ever
observed. The X-ray emission is attributed to circumstellar interaction with the
dense wind from its red supergiant progenitor. Of 17 supernovae yet detected in
X-rays, SN1986J is one of only two followed in X-rays for more than a year. A
Cycle 1 Chandra observation provided the first view of the X-ray spectrum,
uncontaminated by emission from the host galaxy and from a nearby ultraluminous
X-ray source. Compared with ASCA observations taken four years earlier, the
Chandra spectrum shows strong evidence for spectral evolution as the supernova
dims $\propto t^{-2.4}$. We propose a second Chandra observation of SN1986J, four
years later, to monitor the evolving X-ray spectrum of this unique source.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
02:22:31.30 +42:19:57.30 SN 1986J ACIS-S NONE 125.00
===================================================================================
Proposal Number: 05500473
Proposal Title: Chandra AO5 Monitoring Observations of SN1987A
PI: David Burrows
Subject Category: SN, SNR AND ISOLATED NS
Abstract: SN1987A provides a unique opportunity to study the development of a
young supernova remnant at high resolution. We have monitored SN1987A at roughly
six month cadence since Chandra AO1. The remnant is expanding and is increasing
rapidly in brightness, with a factor of six-fold increase since AO1. 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, the
development of new X-ray hot spots, and searching for a compact object.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:35:28.00 -69:16:11.10 SNR1987A ACIS-S NONE 50.00
05:35:28.00 -69:16:11.10 SNR1987A ACIS-S NONE 50.00
===================================================================================
Proposal Number: 05500505
Proposal Title: PRECISION TIMING OF A POSSIBLE NEW ANOMALOUS X-RAY PULSAR
PI: BRYAN GAENSLER
Subject Category: SN, SNR AND ISOLATED NS
Abstract: Anomalous X-ray Pulsars (AXPs) are an exotic population of pulsating
X-ray sources, which increasing evidence suggests are highly magnetized neutron
stars ("magnetars"). However, only five AXPs sources are known; this paucity
prevents us from understanding the global properties of this population and their
relation to other types of neutron star. Recently an X-ray source in the Small
Magellanic Cloud with either a 5.4- or 8.0-second period was identified in
archival Chandra data. We here propose follow up observations aimed at studying
this source's long-term timing behavior and other properties. The results of
these measurements can determine whether this source is the sixth known AXP.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
01:00:43.10 -72:11:33.80 CXOU J010043.1-72113 ACIS-S NONE 17.00
01:00:43.10 -72:11:33.80 CXOU J010043.1-72113 ACIS-S NONE 17.00
01:00:43.10 -72:11:33.80 CXOU J010043.1-72113 ACIS-S NONE 17.00
01:00:43.10 -72:11:33.80 CXOU J010043.1-72113 ACIS-S NONE 17.00
01:00:43.10 -72:11:33.80 CXOU J010043.1-72113 ACIS-S NONE 17.00
===================================================================================
Proposal Number: 05500525
Proposal Title: Spectroscopic Study of the Dynamic Shock in the Pulsar Wind of
the Crab Nebula
PI: Koji Mori
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose monitoring observations of the Crab Nebula using a short
frame time combined with the transmission grating, which suppress an event
pile-up and allow us to perform a spectroscopic study of wisps and inner ring for
the first time. Both wisps and inner ring are related to a magnetohydrodynamic
shock where the pulsar wind is terminated, randomized, and diffuse into the
pulsar wind nebula. Thus, to derive the spectral properties as well as the
dynamic properties is crucial to understand a formation mechanism of the pulsar
wind nebula. This proposed observation also allows us to study a longer-term
variabilities.
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 15.00
05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 15.00
05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 15.00
05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 15.00
===================================================================================
Proposal Number: 05500532
Proposal Title: A Day in the Life of a Short Gamma-Ray Burst
PI: David Burrows
Subject Category: SN, SNR AND ISOLATED NS
Abstract: Gamma-ray burst models favor massive stellar collapse as the mechanism
for long bursts and compact binary mergers for short bursts. While much
observational progress has been made in recent years for afterglows of long
bursts, nothing is known about afterglows of short bursts. The imminent launch of
the Swift observatory will allow us to study short burst afterglows, and Chandra
observations will be critical in determining their proximity to host galaxies and
in studying progenitor environments through measurements of spectral lines. We
propose 3 targets of opportunity to study short burst afterglows: a 25 ks imaging
observation of a relatively faint afterglow; a 100 ks ACIS-S3 observation of a
moderately bright afterglow; and a 100 ks ACIS/HETG observation of a bright
afterglow.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
Swift Short GRB2 ACIS-S NONE 100.00
===================================================================================
Proposal Number: 05500612
Proposal Title: The Lobe in CTB-109
PI: Manami Sasaki
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose a deep ACIS-I pointing at an unusually bright diffuse
feature interior to the galactic remnant CTB 109 (G109.1-1.0). This feature has
been previously associated with the pulsar 1E 2259+586. A more likely explanation
is that the feature is enhanced emission from the interaction of the remnant with
a nearby molecular cloud complex. We have new high-resolution CO data which
support the interaction hypothesis. Our observation will probe the shock/cloud
interaction by detecting fine structure down to a few arcseconds, which we will
compare to new, ground-based IR measurements. Our observation will also provide
spectral evidence of an interaction by measuring abundance variations produced by
the destruction of dust and the release of refractory elements back into the
plasma.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
23:02:21.00 +58:59:27.00 CTB-109 Lobe ACIS-I NONE 80.00
===================================================================================
Proposal Number: 05500617
Proposal Title: Prompt Chandra Observations of Nearby Supernovae
PI: Walter Lewin
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose to continue our studies of Type II and Type Ib/c supernovae
(SNe). Our work on SNe 1999em and 1998S has shown that Chandra spectra can reveal
details of the star's pre-SN evolution and of the interaction of the
circumstellar matter and the SN ejecta (which is similar to the GRB afterglow
phase), which cannot be obtained from any other wavelength regime. Our X-ray
spectra of 1998S revealed for the first time in a young SN a wealth of heavy
element over-abundances (Ne, Al, Si, S, Ar, and Fe) which could be used to
constrain the progenitor's mass. In the years to come, no doubt, a wide variety
of SNe will be observed with Chandra, and ultimately a picture will emerge that
will substantially deepen our knowledge. With SN 1998S we have only begun to
scratch the surface.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
SN within 10 Mpc ACIS-S NONE 50.00
SN within 10 Mpc ACIS-S NONE 50.00
SN within 10 Mpc ACIS-S NONE 50.00
SN within 10 Mpc ACIS-S NONE 50.00
1988Z-like SN from 1 ACIS-S NONE 30.00
1988Z-like SN from 1 ACIS-S NONE 30.00
1988Z-like SN from 1 ACIS-S NONE 30.00
===================================================================================
Proposal Number: 05500623
Proposal Title: The Cassiopeia A Explosion: Getting at the Core Issues
PI: Una Hwang
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose a deep 1 Ms observation of the core-collapse remnant Cas A
as a unique and important legacy of the Chandra Observatory. These data may be
used to construct an observational nucleosynthesis curve giving composition by
mass for all the X-ray emitting ejecta, and to study explosion asymmetries,
turbulent mixing, particle acceleration, and the compact remnant. Particularly
for a detailed study of the various processes that produce and distribute the
heavy elements in a core-collapse explosion, Cas A is perhaps the best candidate
target. Important results have been obtained with the existing <50 ks
observations, but true breakthroughs may be expected with a much deeper exposure
that allows us to study nucleosynthesis and core-collapse using Chandra's full
spatial resolution.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
23:23:26.70 +58:49:03.00 Cassiopeia A ACIS-S NONE 150.00
23:23:26.70 +58:49:03.00 Cassiopeia A ACIS-S NONE 170.00
23:23:26.70 +58:49:03.00 Cassiopeia A ACIS-S NONE 170.00
23:23:26.70 +58:49:03.00 Cassiopeia A ACIS-S NONE 170.00
23:23:26.70 +58:49:03.00 Cassiopeia A ACIS-S NONE 170.00
23:23:26.70 +58:49:03.00 Cassiopeia A ACIS-S NONE 170.00
===================================================================================
Proposal Number: 05500645
Proposal Title: Spatially resolved grating spectrometry of the newborn supernova
remnant SNR1987A
PI: Richard Mcc