|
|
|
Chandra proposals are divided into the following categories:
***********************************************************************************
SOLAR SYSTEM
--------------------------------------------------
===================================================================================
Proposal Number: 04100120
Proposal Title: SPATIALLY RESOLVED X-RAY EMISSION FROM SATURN
PI: JAN NESS
Subject Category: SOLAR SYSTEM
Abstract: We plan to investigate the spatial distribution of X-ray emission from
Saturn in order to confirm a former detection from Ness & Schmitt 2000 (A&A, 355,
394) found with ROSAT-PSPC and to verify whether the X-ray emission comes from
Saturn's aurora as already found for Jupiter with the HRC-I. This would supply
information about the physical origin of the X-ray emission.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
SATURN ACIS-S NONE 70.00
===================================================================================
Proposal Number: 04100190
Proposal Title: MULTIWAVELENGTH OBSERVATIONS OF JUPITER'S AURORAL HOT SPOT
PI: RONALD ELSNER
Subject Category: SOLAR SYSTEM
Abstract: Joint Chandra HRC-I and HST STIS observations in Dec 2000 found: (1)
the northern auroral x-ray emission comes from a localized hot spot poleward of
the main auroral oval, magnetically connected to regions in the outer
magnetosphere beyond 30 Jupiter radii; and (2) the x-ray hot spot pulsates with a
period about 45 minutes. The hot spot occurs in a region where both anomalous
infrared emissions and bright, transient far-ultraviolet (FUV) 'flares' have been
observed. These results are inconsistent with excitation by energetic heavy ions
precipitating from the Io plasma torus. We propose simultaneous HST-STIS and
Chandra-ACIS-S observations of Jupiter seeking to understand the source
mechanisms and energetics of the jovian x-ray aurora. We will also seek
simultaneous IRTF observations.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
08:51:12.64 +18:33:36.40 JUPITER ACIS-S NONE 41.70
08:51:45.79 +18:31:25.10 JUPITER ACIS-S NONE 30.30
===================================================================================
Proposal Number: 04100561
Proposal Title: OBSERVATION OF SATURN AND TITAN PASSING IN FRONT OF THE CRAB
NEBULA
PI: HIROSHI TSUNEMI
Subject Category: SOLAR SYSTEM
Abstract: Saturn will have a conjunction with the Crab nebula on January 5,2003,
which is a very rare event since Saturn passes about 1' away from the pulsar. We
propose to observe this spectacular phenomenon with Chandra so that we can apply
the X- ray absorption technique to the Saturnian system. There are three bodies
involv ed in this conjunction: Saturn, its rings and its satellite, Titan. We
will be able to measure the absorption feature of atmospheres of the main body of
Saturn and Titan. We can also measure the X-ray reduction ratio at the ring that
show s the filling factor within the ring.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:34:29.65 +22:01:00.66 TITAN ACIS-S HETG 10.40
05:34:31.66 +22:00:59.26 TITAN ACIS-S HETG 11.00
05:34:33.78 +22:00:58.90 TITAN ACIS-S HETG 11.00
***********************************************************************************
NORMAL STARS AND WD
--------------------------------------------------
===================================================================================
Proposal Number: 04200007
Proposal Title: SPECTROSCOPY OF PRE-MAIN SEQUENCE STARS: TV CRT - ACCRETION OR
DYNAMO?
PI: CLAUDE CANIZARES
Subject Category: NORMAL STARS AND WD
Abstract: The only high-resolution X-ray spectrum of a low-mass, pre-main
sequence Classical T Tauri star, TW Hya, showed dramatic differences from all
other stellar coronal spectra: very cool, sharply peaked temperature
distribution, and high density. Abundances were similar to, but more extreme,
than other coronae: very weak iron, and very strong neon. We attributed the X-ray
emission to accretion, not to a rotationally driven magnetic dynamo. Observations
of a weak-lined T Tauri star, TV Crt (HD98800), in the same association will
provide a valuable comparison of a young corona w/ little or no accretion but of
similar age and evolutionary history. High-resolution studies like these are
required to provide a basis for interpretation of imaging surveys of other
pre-main sequence systems.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
11:22:05.30 -24:46:39.80 TV CRT ACIS-S HETG 100.00
===================================================================================
Proposal Number: 04200026
Proposal Title: AN ULTRADEEP CHANDRA STUDY OF THE ORION NEBULA (HRC GTO TEAM
PORTION)
PI: STEPHEN MURRAY
Subject Category: NORMAL STARS AND WD
Abstract: This is a request to include 100 ks of Guaranteed Time from the HRC GTO
Team's allocation with the ultradeep Orion Nebula GO proposal. The full science
proposal is presented in the GO Large Project proposal entitled 'An ultradeep
Chandra study of the Orion Nebula', with PI Eric Feigelson. We request that both
the HRC and ACIS Team GTO proposals and the GO proposal be evaluated and approved
or rejected together. The observations must also be scheduled in a single
continuous observation (see Remarks).
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:35:16.70 -05:23:24.00 ORION NEBULA CLUSTER ACIS-I NONE 70.00
===================================================================================
Proposal Number: 04200045
Proposal Title: OBSERVATION OF THE CORE OF THE RCRA DARK CLOUD
PI: GORDON GARMIRE
Subject Category: NORMAL STARS AND WD
Abstract: This is the second 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
-----------------------------------------------------------------------------------
19:01:50.60 -36:57:30.00 RCRADARKCLOUD ACIS-I NONE 40.00
===================================================================================
Proposal Number: 04200048
Proposal Title: CHANDRA ORION MEGASECOND PROGRAM (***ACIS*** TEAM PORTION)
PI: GORDON GARMIRE
Subject Category: NORMAL STARS AND WD
Abstract: This is a request to include 50 ks of Guaranteed Time allocated to the
***ACIS*** Team to the ChOMP. The full ChOMP science proposal is presented in the
GO Long Project proposal entitled 'Chandra Orion Megasecond Program' with Eric
Feigelson, PI. We request that all ChOMP GTO and GO proposals be evaluated and
approved or rejected together. The observations must also be scheduled in a
single continuous observation (see Remarks).
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:35:16.70 -05:23:24.00 ORION NEBULA CLUSTER ACIS-I NONE 50.00
===================================================================================
Proposal Number: 04200050
Proposal Title: AN ACIS OBSERVATION OF THE MASSIVE STAR-FORMING REGION RCW 49
PI: GORDON GARMIRE
Subject Category: NORMAL STARS AND WD
Abstract: We will observe RCW 49, a prominent giant H II region, and its ionizing
cluster Westerlund 2, an OB association containing at least a dozen OB stars. Our
observation consists of a single ACIS-I pointing, to resolve and study the
high-mass stellar population in the cluster ionizing the H II region and to image
the bubbles around the two Wolf-Rayet stars.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
10:24:02.50 -57:45:23.00 RCW 49 ACIS-I NONE 40.00
===================================================================================
Proposal Number: 04200052
Proposal Title: CATCHING THE THIRD GENERATION OF YSOS IN THE CEPB/S155 INTERFACE
REGION
PI: GORDON GARMIRE
Subject Category: NORMAL STARS AND WD
Abstract: In a single Chandra field we will make a snapshot of the violent
interaction of young stars with their natal cloud. We will be able to study the
properties of two generation of young stars, one, already emerged from the cloud,
and another, deeply embedded into it. The second includes the nearest known
candidate of high mass protostellar object (HMPO). Our goals are: to confirm the
YSO status of IR sources, compare the spectra and variability for different types
of YSOs, search for the extended emission from O-star winds, construct X-ray
luminosity and initial mass functions of the emerged generation, become
acquainted with the X-ray properties of HMPO; and study the star formation
history of this region.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
22:56:47.00 +62:40:00.00 CEP B ACIS-I NONE 30.00
===================================================================================
Proposal Number: 04200106
Proposal Title: THE CORONAL SPECTRA OF POST-T TAURI STARS IN THE NEARBY TUCANAE
ASSOCIATION
PI: SALVATORE SCIORTINO
Subject Category: NORMAL STARS AND WD
Abstract: We propose to observe the two X-ray brightest single young (10-20 Myr)
late-type stars of the recently discovered nearby Tucanae Association. The
collected HETG spectra will allow the unique opportunity of characterizing the
properties of coronae of late-type active single stars still on the radiative
track while contracting toward the main-sequence. This will allow us to
investigate the effect of binarity versus youth in determinig the shape of
differential emission measure distribution and abundances of stellar coronae in a
region of the age-activity-rotation parameter space still essentially
unexplored.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:53:05.90 -50:10:49.90 HIP 92680 ACIS-S HETG 75.00
===================================================================================
Proposal Number: 04200107
Proposal Title: MORPHOLOGY OF THE X-RAY EMISSION FROM PROTOSTELLAR JETS
PI: FABIO FAVATA
Subject Category: NORMAL STARS AND WD
Abstract: Following our detection and study of X-ray emission from a shock
associated with a protostellar jet (from L1551 IRS5) we propose to observe with
Chandra HH 355F and HH 311, two shocks associated with protostellar jets for
which previous (unreported) evidence of associated X-ray emission is present. The
spatial resolution of Chandra will allow to study the structure and the
distribution of the X-ray emission along the extent of the shock front, as well
as to perform spatially resolved low-resolution X-ray spectroscopy, thus studying
the physical conditions in the two targets, and also assessing their influence on
the conditions of e.g. the protostellar accretion disk.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
04:22:04.50 +19:14:37.00 HH 355F ACIS-S NONE 30.00
===================================================================================
Proposal Number: 04200113
Proposal Title: CORONAL STRUCTURES IN YELLOW GIANT STARS
PI: F. HARNDEN, JR.
Subject Category: NORMAL STARS AND WD
Abstract: With three ACIS-S/HETG observations of selected yellow giants of
similar masses (equal to about 2 solar masses), we will study the role of
"solar-like" magnetic dynamos in generating the X-ray coronae of such stars and
explore the response of the coronae to changes in internal stellar structure.
Spectroscopic plasma density diagnostics derived from the HETG X-ray spectra will
be used to infer characteristics of the coronal magnetic structures of these
stars in selected post-main-sequence evolutionary stages, testing whether the
size of X-ray emitting structures changes as giants of approximately equal mass
evolve from warmer to cooler temperatures through the Hertzsprung gap.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
23:25:22.80 +23:24:14.80 HD 220657 ACIS-S HETG 110.00
===================================================================================
Proposal Number: 04200117
Proposal Title: RESOLVING THE TRIPLE PROTOSTAR/T TAU SYSTEM T TAU NS
PI: MANUEL GUEDEL
Subject Category: NORMAL STARS AND WD
Abstract: We propose to fully resolve the T Tau N/S system in X-rays for the
first time, using the HRC-I on Chandra for 60 ks. The two stars are embedded in
envelopes and accrete matter in accretion disks. Several Herbig-Haro objects are
present, some of which may produce detectable X-rays as well. A third stellar
component has recently been identified; it will be resolved by radio
interferometry also proposed. Correlated activity in both wavelength regimes will
help associate the emission to particular components and will provide insight
into high-energy mechanisms in magnetically accreting protostars.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
04:21:59.40 +19:32:06.40 T TAU HRC-I NONE 30.00
===================================================================================
Proposal Number: 04200145
Proposal Title: IMAGING THE JET FROM A HERBIG AE STAR
PI: DOUGLAS SWARTZ
Subject Category: NORMAL STARS AND WD
Abstract: The nearby Herbig Ae star HD 163296 has a strong, possibly x-ray
emitting, jet extending 6'' above its accretion disk. The combination of an
accretion disk and jet in a relatively old Herbig Ae object, a low extinction due
to a lack of association with dark clouds, the presence of Herbig-Haro objects
along the jet axis, and an otherwise source-free field make HD 163296 a
particularly promising object for imaging spectroscopy with Chandra. We propose a
20~ks non-grating ACIS-S observation of HD 163296 to image the jet, disk, and
other structures; to provide constrain the underlying X-ray emission mechanisms;
and to probe the nature of the magnetic activity, coronae, and outflows of Herbig
Ae systems.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:56:21.00 -21:57:22.00 HD 163296 ACIS-S NONE 20.00
===================================================================================
Proposal Number: 04200248
Proposal Title: X-RAY ACTIVITY IN M-TYPE GIANTS
PI: MATTHIAS HUENSCH
Subject Category: NORMAL STARS AND WD
Abstract: We propose to observe four M-type giants detected in the course of the
ROSAT all-sky survey in order to confirm the detections, to obtain accurate
positions and count rates, and to explore possible X-ray variability with the
HRC-I. M-type giants are old, low-mass stars to the right of the X-ray dividing
line and are not expected to show magnetic activity and hence X-ray emission at
all. Any X-ray detections among such stars would challenge our ideas of coronal
structures and late stellar activity in giants, since possible companions are not
a reasonable explanation. While two such stars have already been confirmed as
X-ray sources with Chandra in AO2, observations of the remaining stars are
important to determine the fraction of active M-type giants.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
14:46:06.00 +15:07:54.00 HR 5512 HRC-I NONE 1.90
16:38:45.00 +48:55:42.00 HR 6200 HRC-I NONE 2.70
17:14:39.00 +14:23:25.00 HR 6406 HRC-I NONE 1.00
19:47:27.00 +47:54:28.00 HR 7547 HRC-I NONE 2.60
===================================================================================
Proposal Number: 04200261
Proposal Title: TESTING SHOCK THEORIES OF X-RAY EMISSION IN THE YOUNG NEARBY
O-STAR SIGMA ORIONIS
PI: STEPHEN SKINNER
Subject Category: NORMAL STARS AND WD
Abstract: Current theoretical models attribute the X-ray emission of single
O-type stars to strong shocks that form in their line-driven winds. Such models
predict cool X-ray emission (kT < 1 keV) and blueshifted asymmetric emission
lines. In contrast, HETG observations of some O stars show hot dense plasma and
broad symmetric lines. These results have sparked renewed interest in hot star
X-ray emission models that involve magnetic wind confinement. We propose to
observe the young O9V star Sigma Ori with HETG in order to obtain data on line
shapes, centroid shifts, and plasma properties needed to determine if its X-ray
emission is produced by instability-driven shocks and to guide the development of
new models that incorporate dynamic wind-magnetic field interactions.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:38:44.80 -02:36:00.20 HD37468 ACIS-S HETG 100.00
===================================================================================
Proposal Number: 04200300
Proposal Title: ON THE ORIGIN OF THE X-RAY EMISSION IN LATE B-TYPE STARS
PI: NURIA HUELAMO
Subject Category: NORMAL STARS AND WD
Abstract: We propose for Chandra observations of X-ray emitting late B-type
stars. Because they are (theoretically) not expected to emit X-rays, their X-ray
detections have been attributed to unresolved late-type, magnetically active
stars. The aim of this study is to resolve close binary systems comprised of late
B-type stars and visual late-type companions, in order to identify the X-ray
emitter. The binary separations are between (1-8)'', i.e. well resolvable by
Chandra but not with previous instruments. If we found that X-rays are always
emitted by the late-type companions, it can be taken as evidence against
intrinsic X-ray emission from late B-type stars. If not, it would indicate that
these stars could be intrinsic X-ray emitters and stellar theories may have to be
revised.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:06:45.60 -04:39:18.60 HD32964 ACIS-I NONE 2.40
08:38:44.80 -53:05:25.40 HD73952 ACIS-I NONE 7.60
12:39:52.50 -39:59:14.30 HD110073 ACIS-I NONE 2.10
15:13:07.70 -36:05:29.10 HD134837 ACIS-I NONE 3.00
15:13:17.40 -24:00:29.90 HD134946 ACIS-I NONE 2.40
===================================================================================
Proposal Number: 04200331
Proposal Title: AN ULTRADEEP CHANDRA STUDY OF THE ORION NEBULA (GUEST OBSERVER
PORTION)
PI: ERIC FEIGELSON
Subject Category: NORMAL STARS AND WD
Abstract: We propose a 850 ks ACIS-I observation of the Orion Nebula spanning
11.5 contiguous days, with GTO Teams providing 150 ks of the time. The Orion
Nebula is the best target in the sky for Chandra study of stellar magnetic
activity and star formation with extensive multiwavelength support. Science goals
include: addressing the mass- and age-dependence of magnetic activity in brown
dwarfs; uncovering the low-mass members of the deeply embedded clusters;
elucidating the absence of an activity-rotation relation in pre-main sequence
stars; measuring flare frequencies, flare plasma conditions and coronal
structures in dozens of active stars; investigate the nature of OB wind shocks;
and studying X-ray effects on circumstellar environments.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:35:16.70 -05:23:24.00 ORION NEBULA CLUSTER ACIS-I NONE 100.00
05:35:16.70 -05:23:24.00 ORION NEBULA CLUSTER ACIS-I NONE 170.00
05:35:16.70 -05:23:24.00 ORION NEBULA CLUSTER ACIS-I NONE 170.00
05:35:16.70 -05:23:24.00 ORION NEBULA CLUSTER ACIS-I NONE 170.00
05:35:16.70 -05:23:24.00 ORION NEBULA CLUSTER ACIS-I NONE 170.00
===================================================================================
Proposal Number: 04200346
Proposal Title: DISCOVERY OF PARSEC-SCALE OB WIND-SWEPT BUBBLES IN HII REGIONS
PI: LEISA TOWNSLEY
Subject Category: NORMAL STARS AND WD
Abstract: We propose a deep ACIS observation (80 ksec) of the central cavity of
the Rosette nebula, as a follow-up of a shorter (20 ksec) GO2 observation which
revealed diffuse X-rays pervading the HII region, in addition to hundreds of
individual stellar sources. This may be the long-awaited unambiguous detection of
wind-blown bubbles in HII regions and, as such, will give critical insights into
the astrophysics of OB winds. However, the available Rosette exposure cannot
confidently exclude the possibility that the diffuse component there is, at least
in part, the integrated contribution of thousands of lower-mass members of the OB
association. A longer observation should conclusively resolve this question and
lead to insights into the interaction between massive stars and their
environment.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
06:31:55.50 +04:56:34.00 ROSETTE NEBULA / NGC ACIS-I NONE 80.00
===================================================================================
Proposal Number: 04200355
Proposal Title: ACIS IMAGING OF Z CMA SUPERJET
PI: ALBERTO NORIEGA-CRESPO
Subject Category: NORMAL STARS AND WD
Abstract: We want to study the X-ray emission of the FU Orionis binary system Z
CMa. The Z CMa superjet has a angular extent of approximately 8 arcmin, that at a
distance of 1 Kpc corresponds to 2.3pc. The jet is being driven by an embedded
protostar reaching velocities of > 600 km/s creating shocks >300$ km/s and
capable to produce plasma temperatures of more than 1.e+6 K, i.e. well within the
sensitivity threshold of the ACIS detectors. We believe that a longer exposure
coupled with stronger shocks will provide a more convincing picture of X-ray
emission from these objects.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
07:03:43.10 -11:33:06.20 ZCMA ACIS-S NONE 40.00
===================================================================================
Proposal Number: 04200397
Proposal Title: THE SOLAR-STELLAR CONNECTION IN THE NGC 752 OPEN CLUSTER
PI: THEODORE SIMON
Subject Category: NORMAL STARS AND WD
Abstract: Observations of old open clusters were performed by ROSAT, but with
limited sensitivity and spatial resolution. This made it possible to study the
evolution of very active binaries in those clusters, but not the coronal
properties of their main sequence stars. We are proposing a 140 ks ACIS-I
observation of the 2 Gyr old cluster, NGC 752. We wish to compare the coronal
activity of its solar-type stars with the Sun and with the 4 Gyr old stars in the
M 67 cluster. NGC 752 fills in the large age gap between the Hyades and the Sun,
and thus extends the coronal activity-age relation past 1 Gyr for the very first
time. We will also study the coronal evolution of post-main sequence stars and
cluster binaries, providing a more complete comparison of their X-ray properties
up to 4 Gyr.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
01:57:39.00 +37:46:10.00 NGC 752 ACIS-I NONE 140.00
===================================================================================
Proposal Number: 04200415
Proposal Title: CHANDRA HETGS OBSERVATIONS OF EARLY B SUPERGIANTS
PI: WAYNE WALDRON
Subject Category: NORMAL STARS AND WD
Abstract: We are requesting Chandra HETGS observations of 2 early B supergiants,
Epsilon Ori (B0Ia, 94 ks) and Kappa Ori (B0.5Ia, 125 ks). Although these stars
are relatively X-ray bright, neither has been observed directly since the
Einstein era. Our HETGS observations of these stars will extend our understanding
of the He-like f/i line ratio dependence on UV flux by providing measurements of
this ratio at lower UV flux levels. The diversity in their wind properties as
compared to other OB stars will allow us to probe different stellar wind
distributed X-ray source models and test the developing concept that the observed
X-rays from OB stars are emerging from their associated X- ray "photospheres"
(i.e., X-ray depth of unity).
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:36:12.70 -01:12:07.00 EPSILON ORI ACIS-S HETG 94.00
===================================================================================
Proposal Number: 04200417
Proposal Title: DEEP INSIDE THE LAGOON NEBULA
PI: MARC GAGNE
Subject Category: NORMAL STARS AND WD
Abstract: The Lagoon Nebula (M8) is one of the brightest galactic HII regions.
While 9 Sgr (O4) and the adjoining OB cluster NGC 6530 have been well studied,
the low-mass population has been difficult to identify. Based on the number of
optically visible OB stars, we predict that a deep ACIS-I exposure of the Lagoon
nebula region will reveal >1500 X-ray sources, most of them classical and
weak-line T-Tauri stars. At the heart of this region is the Hourglass Nebula, its
exciting O7 star Herschel 36, an ultra-compact HII region, a dense cluster of
infrared objects and a ridge of 850um emission cores: signposts of active star
formation. By matching infrared sources with X-ray selected Class I, II and III
YSOs, we will signficantly increase our census of low-mass stars in galactic HII
regions.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:03:45.10 -24:22:05.00 M8 ACIS-I NONE 15.00
18:03:45.10 -24:22:05.00 M8 ACIS-I NONE 165.00
===================================================================================
Proposal Number: 04200436
Proposal Title: HIGH-RESOLUTION SPECTROSCOPY OF THE CLASSICAL T TAURI STAR SU
AUR
PI: KESTER SMITH
Subject Category: NORMAL STARS AND WD
Abstract: We propose to obtain high-resolution HETG spectra of the Classical T
Tauri star SU Aur. Classical T Tauri stars are unique amongst magnetically active
late-type stars, in that they are accreting material from a circumstellar disc.
Their magnetospheres therefore contain higher density plasma than a normal
M-dwarf or RS CVn. Complex kinematic behaviour is expected from the infalling
plasma. Furthermore, the interaction between stellar magnetic field and inner
disc may drive reconnection in the magnetosphere. All these processes can be
probed in unprecedented detail by Chandra.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
04:55:59.40 +30:34:01.50 SU AUR ACIS-S HETG 101.98
===================================================================================
Proposal Number: 04200452
Proposal Title: PROBING WEAK-LINED T TAURI STARS WITH CHANDRA
PI: STEVEN KAHN
Subject Category: NORMAL STARS AND WD
Abstract: We propose to investigate with Chandra ACIS-S/HETG the thermal plasma
properties of two X-ray bright weak-lined T Tauri stars, V773 Tau and HDE 283572.
They represent extreme cases of magnetic activity with rapid rotation, their
X-ray emission is dominated by hot plasma, and they display large flares. V773
Tau probes the PMS stage of low-mass stars, while HDE 283572 probes the PMS stage
of massive A-type stars. Radio coverage will be requested to monitor the
non-thermal emission. The study in both wavelength regimes will give crucial
information on the energetic processes in young stars with magnetically active
coronae and will provide a link between main-sequence stars and YSOs with
accretion disks. Spectra of nearby X-ray bright Class I to III objects will be
obtained for free as well.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
04:21:58.80 +28:18:06.40 V987 TAU = HDE 28357 ACIS-S HETG 100.00
===================================================================================
Proposal Number: 04200573
Proposal Title: MAPPING MAGNETIC LOOPS IN THE CORONA OF 44I BOO
PI: NANCY BRICKHOUSE
Subject Category: NORMAL STARS AND WD
Abstract: We propose an LETG/HRC-S observation of the bright, eclipsing contact
binary 44i Boo to map coronal structures at different temperatures. This 120 ks
observation will complement the 60 ks archival HETG oservation, which shows
rotationally broadened line profiles and line centroid shifts as a function of
orbital phase. This emission appears to be related to polar starspots found in
optical Doppler images of rapid rotators. Given the short period of 44i Boo (6.4
hr), and the high spectral resolution at long wavelengths of LETG, the emission
lines from a localized active region will exhibit observable line profile
changes. The LETG/HRC-S spectra will provide line shift measurements, light
curves, and diagnostics for temperature, density, and elemental abundances.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
15:03:47.30 +47:39:14.60 44I BOO HRC-S LETG 120.00
===================================================================================
Proposal Number: 04200675
Proposal Title: X-RAY EMISSION FROM MASSIVE PROTO-STARS
PI: PETER HOFNER
Subject Category: NORMAL STARS AND WD
Abstract: The formation of massive stars remains a challenge to contemporary
astrophysics. Due to the high extinction in the molecular cloud core where
massive stars form direct observation of the massive proto-stars is only possible
at high X-ray energies. We propose ACIS-I observations of 2 new massive
proto-stars which are still in an active accretion phase. The proposed
observations will allow us to determine for the first time the precise position
of the massive protostars with respect to the surrounding molecular and ionized
gas. The measured luminosity will give first constraints on the physical
mechanism responsible for the X-ray emission and we expect to perform
spectroscopy to derive physical parameters of the matter in the interface between
proto-stellar surface and the accretion disk.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
20:14:29.06 +41:13:32.50 IRAS 20126+4104 ACIS-I NONE 40.00
===================================================================================
Proposal Number: 04200796
Proposal Title: X RAYS FROM A HIGHLY ACTIVE, VERY YOUNG BROWN DWARF
PI: JOHN GIZIS
Subject Category: NORMAL STARS AND WD
Abstract: USing 2MASS data and CTIO photometry, an isolated, 25 Jupiter mass
brown dwarf has been discovered in the TW Hya association. This M8 brown dwarf
shows extremely strong H alpha emission, indicating it is the second member of a
rare class of highly active, young brown dwarfs. Chandra observations are needed
to understand the nature of activity. The proposed observations will obtain an
X-ray spectrum of the brown dwarf, or else set a surprisingly deep upper limit on
any X-ray activity.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
12:07:33.40 -39:32:54.00 2MASSW J1207334-3932 ACIS-S NONE 50.00
===================================================================================
Proposal Number: 04200847
Proposal Title: FINE X-RAY TOMOGRAPHY OF PLANETARY NEBULA
PI: JUN'ICHI KOTOKU
Subject Category: NORMAL STARS AND WD
Abstract: Although PNs have been thus made a stimulating new addition to the
X-ray source populations, the X-ray emission mechanisms and the association
between X-ray emitting regions and characteristic features observed in other
wavelengths have not yet been clarified, and samples of X-ray PNs are still quite
limited. To establish the nature of X-ray emitting PNs, observations with a finer
spatial resolution are obviously inevitable. Here, to apply brand-new,
X-ray-morphology diagnostic for another PNs with finer spatial resolution, and to
verify the role of stellar wind which has been critical in the de facto standard
model of the X-ray emission mechanism in PNs, we propose to observe the most
promising candidate, NGC 4361 with Chandra ACIS-S.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
12:24:31.00 -18:47:09.20 NGC 4361 ACIS-S NONE 30.00
===================================================================================
Proposal Number: 04200848
Proposal Title: CONSTRAINING THE T TAURI STAR X-RAY EMISSION MECHANISM:
HIGH-RESOLUTION SPECTROSCOPY OF THE YOUNG STAR DOAR 21
PI: ERIC JENSEN
Subject Category: NORMAL STARS AND WD
Abstract: Though most low-mass pre-main-sequence stars (T Tauri stars) emit
x-rays, the x-ray emission mechanism is not well constrained by existing
observations. We propose high-spectral resolution HETGS/ACIS observations of the
weak-line T Tauri star DoAr 21. Through temperature- and density-sensitive line
ratios, and measurements of line widths, the proposed observation will provide
details on the physical condition in the x-ray emitting region, helping to
distinguish between models of x-ray emission from solar-type magnetic activity
and models of star-disk interactions.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
16:26:03.20 -24:23:40.00 DOAR 21 ACIS-S HETG 100.00
===================================================================================
Proposal Number: 04200865
Proposal Title: PROBING THE CORONA OF AN ACTIVE SOLAR-TYPE STAR
PI: GAITEE HUSSAIN
Subject Category: NORMAL STARS AND WD
Abstract: Observations of active cool stars indicate that flux emerges at high
latitudes. We will use LETG spectra of AB Dor (K0V) to look for rotational
modulation in line profiles and thus to evaluate the locations of emitting
regions. Time-constrained observations are requested in order to obtain
contemporaneous surface magnetic field maps. These maps will be extrapolated to
produce a 3-D coronal field model for the star. The 3-D model can be used to
synthesise Doppler-shifted line profiles as the star rotates in a physically
realistic way that includes self-eclipse effects. This will enable us to probe
the relationship between X-ray emitting structures in the corona and magnetic
structures that can be mapped in detail at the photosphere.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:28:44.50 -65:27:02.20 AB DORADUS HRC-S LETG 88.26
===================================================================================
Proposal Number: 04200952
Proposal Title: HOT GAS IN THE CIRCUMSTELLAR BUBBLE NGC 6888
PI: ROBERT GRUENDL
Subject Category: NORMAL STARS AND WD
Abstract: Fast stellar winds from massive stars can blow bubbles in the ambient
medium. Bubble interiors should be filled with shocked fast wind at
X-ray-emitting temperatures. Diffuse X-rays have been unambiguously detected in
NGC6888 and S308, two circumstellar bubbles around Wolf-Rayet stars. Both show
X-ray luminosities 1--2 orders of magnitude lower than expected in adiabatic
bubble models. To explain this discrepancy, a mass-loading bubble model has been
proposed and appears to be able to explain the temperature and surface brightness
profiles of S308 as derived from XMM data. We request a deep Chandra ACIS-S
observation of the X-ray-bright northeast part of NGC6888 in order to assess the
applicability of mass-loading bubble models and to quantify the physical process
of cloud evaporation.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
20:12:35.00 +38:26:30.00 NGC 6888 ACIS-S NONE 100.00
===================================================================================
Proposal Number: 04200970
Proposal Title: MU LEP: A CASE STUDY FOR THE ORIGIN OF X-RAYS FROM CHEMICALLY
PECULIAR LATE B STARS
PI: EHUD BEHAR
Subject Category: NORMAL STARS AND WD
Abstract: Bright X-ray emission from isolated late B stars remains unexplained,
as conventional theory predicts these stars neither to have coronae nor to eject
sufficiently intense stellar winds. Among those that have been detected, several
of the brightest are chemically peculiar stars. We propose to observe Mu Lep, the
X-ray brightest HgMn star and to use a variety of spectroscopic techniques as
well as the high angular resolution of Chandra to unveil the source of its X-ray
emission, whether shocks in stellar winds, magnetically active regions, or an
invisible companion. The X-ray-measured abundance patterns will be compared with
those in the photosphere. X-ray emission from peculiar elements, which could
provide a definite association of the X-rays with the B star, will be sought.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:12:55.90 -16:12:19.70 MU LEP (HR 1702, HD HRC-S LETG 100.00
===================================================================================
Proposal Number: 04200729
Proposal Title: INVESTIGATING COLLIDING WINDS AND MAGNETISED STARS 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. Sensitive observations for X-ray emission in PPNs, however, do
not exist. We propose ACIS-S observations of 4 well-studied PPNs with very fast
outflows in order to directly probe (a) the very hot (10$^{7-8}$K) shocked gas
which must result from the interaction, and (b) the presence of strong stellar
magnetic fields which may be responsible for collimating the fast outflows. These
data will be invaluable in testing theoretical models of X-ray emission in PPNs
and PNs.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
07:42:16.80 -14:42:52.00 OH231.8+4.2 ACIS-S NONE 50.00
===================================================================================
Proposal Number: 04200138
Proposal Title: HETGS SPECTROSCOPY OF A CORONALLY ACTIVE CONTACT BINARY, VW CEP
PI: DAVID HUENEMOERDER
Subject Category: NORMAL STARS AND WD
Abstract: Short-period binaries represent the extreme in rotational-dynamo
generated coronae. These stars are important for probing the origin and nature of
coronae in the regimes of rapid rotation and activity saturation. A relatively
bright, partially eclipsing, and very active object is VW Cep (P=0.28d). We will
derive emission measure distributions and abundances from diagnostics currently
available only in HETGS spectra. We will also examine spatial distributions
through flux modulation and Doppler shifts. Two hypotheses exist for loop sizes;
HETGS spectra will distinguish between these with density and volume estimates.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
20:37:21.50 +75:36:01.50 VW CEP ACIS-S HETG 120.00
***********************************************************************************
WD BINARIES AND CV
--------------------------------------------------
===================================================================================
Proposal Number: 04300030
Proposal Title: NEAR-EDDINGTON ACCRETION IN THE BINARY SUPERSOFT X-RAY SOURCE RX
J0513.3-6951
PI: PETER PREDEHL
Subject Category: WD BINARIES AND CV
Abstract: Study of the X-ray properties of the binary supersoft X-ray source RX
J0513.3-6951. Search for absorption edges expected in heated atmospheres of white
dwarfs.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:13:50.80 -69:51:47.00 RXJ0513.9-6951 HRC-S LETG 48.00
===================================================================================
Proposal Number: 04300201
Proposal Title: THE STRUCTURE OF THE BOUNDARY LAYER OF U GEMINORUM IN OUTBURST
PI: CHRISTOPHER MAUCHE
Subject Category: WD BINARIES AND CV
Abstract: U Geminorum in outburst is an ideal laboratory in which to study the
response of the boundary layer of nonmagnetic CVs to the ~3 order-of-magnitude
increase in the mass-accretion rate of dwarf novae in outburst. Despite extensive
observations in quiescence, U Gem has only infrequently been observed in the
X-ray band in outburst, and never with "modern" (CCD, grating) instruments. We
propose to remedy this situation by obtaining a TOO Chandra HETG spectroscopic
observation of U Gem in outburst to determine the emission measure distribution,
the velocity widths of the lines, the plasma density, the wavelength dependence
of the dips in the light curves and the quasiperiodic oscillations, thereby
providing constraints of the thermal, physical, and temporal structure of its
boundary layer.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
07:55:05.30 +22:00:05.70 U GEM ACIS-S HETG 67.00
===================================================================================
Proposal Number: 04300237
Proposal Title: THE ANISOTROPIC TRANSFER OF RESONANCE PHOTONS IN CATACLYSMIC
VARIABLES
PI: YUKIKATSU TERADA
Subject Category: WD BINARIES AND CV
Abstract: The purpose of the present proposal is to establish a new idea of an
anisotropic transfer of resonance photons in the accretion column of polars,
which we have developed with Monte Carlo simulations and ASCA observations
(Terada et al. 1999, 2001; Terada 2002). Our goal is to demonstrate the
rotational modulation of equivalent width of resonance lines from light elements,
such as S, Si, Al, Mg, Ne, and Na, via Chandra HETG observation of a polar V834
Centauri, and to confirm our scenario by comparing the observed anisotropy with
expectations by our Monte Carlo calculations.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
14:09:07.50 -45:17:17.10 V834 CENTAURI ACIS-S HETG 60.00
===================================================================================
Proposal Number: 04300295
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 3 TOO
proposal, which has not been triggered as of March 14, 2002.]
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: 04300437
Proposal Title: TIMING THE ORBIT OF RX J1914.4+2456: GRAVITATIONAL RADIATION AND
THE NATURE OF THE X-RAY EMISSION
PI: TOD STROHMAYER
Subject Category: WD BINARIES AND CV
Abstract: We propose observations of RX J1914.4+2456, a candidate
double-degenerate binary with one of the shortest orbital periods known. We have
recently found evidence for gravitational radiation induced decay of its orbit
from precise timing of archival ROSAT observations. Direct study of the orbital
evolution has important implications for the nature of the X-ray flux from this
and related systems. We propose to confirm our preliminary ROSAT orbit ephemeris
and enable long term timing of the orbit to probe the physics of gravitational
radiation and its effect on binary evolution. We will also search for a possibly
hidden orbital period longward of the observed 569 s period. Such future timing
would enable new gravity wave science with NASA's LISA mission.
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 10.00
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 35.00
===================================================================================
Proposal Number: 04300505
Proposal Title: IN SEARCH OF THE X-RAY COUNTERPART TO KUV 01584-0939 (CET3)
PI: TOD STROHMAYER
Subject Category: WD BINARIES AND CV
Abstract: We propose an exploratory Chandra observation of KUV 01584-0939 (Cet3),
a candidate double-degenerate binary with a 10 minute period discovered in the
optical. We have tentatively identified an X-ray counterpart in the ROSAT faint
source catalog (1RXS J020052.9-092435). Our observations will definitively
confirm or reject this identification. The system appears very similar to several
candidate double-degenerate (AM CVn) binaries which show strong modulations in
the X-ray (for example, RX J1914+24 and RX J0806+15). If the candidate ROSAT
source is related to Cet3, then it will very likely be pulsed at or near the 10
min. optical period (which may be a superhump period). We will search for the
X-ray period and if found begin a timing campaign to monitor the orbital
evolution.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
02:00:52.90 -09:24:35.50 1RXS J020052.9-09243 ACIS-S NONE 20.00
===================================================================================
Proposal Number: 04300626
Proposal Title: PROBING THE BOUNDARY LAYER AND WIND OF U GEM IN OUTBURST
PI: KNOX LONG
Subject Category: WD BINARIES AND CV
Abstract: EUVE observations have identified the dwarf nova U Geminorum as the
first (and so far only) example of a disk-accreting white dwarf system with a
"classical" boundary layer. As such, it provides a unique opportunity for
exploring the physics of the accretion disk-central object interaction. We
propose to exploit this opportunity with a 50 ksec HRC-S/LETG observation of U
Gem in outburst in order to obtain high quality, phase resolved spectra. The
observations will allow us to accurately characterize the optically-thick
boundary layer emission and to probe the structure and kinematics of the extended
material, whether wind or accretion stream, surrounding the boundary layer and
disk, and will lead to solid understanding of the nature of the disk-white dwarf
interaction.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
07:55:05.30 +22:00:06.00 U GEM HRC-S LETG 50.00
===================================================================================
Proposal Number: 04300647
Proposal Title: MULTIWAVELNGTH TARGET OF OPPORTUNITY OBSERVATIONS OF A 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 X-ray studies have
shown that X-rays are the best tool for studying the hot phase of the outburst.
In Cycle 1 we obtained spectra of V382 Vel and V1494 Aql. V382 Vel showed only an
emission line spectrum in our data while V1494 Aql evolved from an emission line
spectrum to that of a Super Soft Source (SSS). Observations of these phases
provided an opportunity 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 new novae is needed because the behavior of these two
novae was very different, which is expected from theory.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:01:09.38 -22:00:05.90 V4743 Sgr HRC-S LETG 25.00
19:01:09.38 -22:00:05.90 V4743 Sgr HRC-S LETG 25.00
19:01:09.38 -22:00:05.90 V4743 Sgr ACIS-S NONE 5.00
===================================================================================
Proposal Number: 04300708
Proposal Title: A UNIFORM STUDY OF GLOBULAR CLUSTER X-RAY SOURCES: THE KEY 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
-----------------------------------------------------------------------------------
00:52:45.30 -26:34:43.00 NGC 288 ACIS-S NONE 55.00
17:17:07.30 +43:08:11.50 NGC 6341 ACIS-S NONE 52.00
18:08:02.20 -43:42:19.70 NGC 6541 ACIS-S NONE 46.00
===================================================================================
Proposal Number: 04300925
Proposal Title: X-RAYING BAADE'S WINDOW THROUGH THE GALACTIC BULGE
PI: JONATHAN GRINDLAY
Subject Category: WD BINARIES AND CV
Abstract: We propose to conduct the first of a two-part deep galactic plane
survey on one ACIS-I field in Baade's Window, a region of low obscuration near
the galactic center. The survey will reach a sensitivity limit of Lx ~ 3 x 10^30
erg/s for sources in the galactic bulge, and thus provide the first census of
accretion powered binaries (cataclysmic variables and quiescent low mass x-ray
binaries) as well as millisecond pulsars to constrain the stellar and binary
evolution of the bulge vs. the populations in globular clusters and the disk.
Optical identifications will be made with a coordinated mosaic survey with ACS on
HST (B/R/Halpha), to achieve a sensitivity for CVs down to their luminosity
function peak at Mv ~9. A later, followup survey would complete the coverage of
Baades Window.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:03:21.70 -29:58:27.00 BAADE'S WINDOW FIELD ACIS-I NONE 100.00
===================================================================================
Proposal Number: 04300907
Proposal Title: A X-RAY WINDOW TO V838 MON, A BRIGHT SYMBIOTIC NOVA
PI: MARINA ORIO
Subject Category: WD BINARIES AND CV
Abstract: We propose to observe V838 Mon, a bright symbiotic star which underwent
a nova like outburst in January of 2002. Symbiotic novae are X-ray sources and
the properties of their X-ray emission indicate how the mass ejection occurs, and
whether the hot white dwarf remnant grows in mass towards the Chandrasekhar mass
and a type Ia SN outburst. Symbiotic nova outburst are observed only every few
years. The last bright outburst of this type was observed in 1944, so this is an
opportunity that should not be missed. Following a short ACIS-S observation, we
propose two grating observations if the source is sufficiently bright.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
07:04:04.80 -03:50:51.10 V838 MON HRC-S LETG 50.00
07:04:04.80 -03:50:51.10 V838 MON ACIS-S NONE 7.00
07:04:04.80 -03:50:51.10 V838 MON ACIS-S HETG 25.00
***********************************************************************************
BH AND NS BINARIES
--------------------------------------------------
===================================================================================
Proposal Number: 04400009
Proposal Title: REOLVING THE SHORT GAMMA-RAY BURST MYSTERY
PI: KEVIN HURLEY
Subject Category: BH AND NS BINARIES
Abstract: Gamma-ray bursts may be divided into two categories: short-duration and
long-duration. No X-ray follow-up observation has ever been made for a short GRB,
and despite searches, no optical or radio counterpart has ever been found for one
either. We propose to observe the error boxes of two short bursts detected by the
Interplanetary Network with ACIS-I. The detection of a fading X-ray counterpart
will establish a ~1" position for the burst, which can then be searched much
deeper in the optical and radio ranges for a fading counterpart and a host
galaxy. These observations will help determine whether the origin of the short
bursts is different from those of the long ones (e.g. merging neutron stars vs.
hypernovae).
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
08:07:46.10 +21:14:17.90 GRB021201 ACIS-I NONE 20.00
08:07:46.10 +21:14:17.90 GRB021201 ACIS-I NONE 20.00
===================================================================================
Proposal Number: 04400027
Proposal Title: VARIABILITY IN THE LINE EMISSION OF THE X-RAY PULSAR 4U 1626-67
PI: CLAUDE CANIZARES
Subject Category: BH AND NS BINARIES
Abstract: 4U1626-67 is an ultracompact system which consists of a disk-accreting
magnetic neutron star and a very low mass, hydrogen-depleted companion in a
42-min binary. During AO1 we resolved the Ne/O emission line complex into Doppler
pairs of broadened (~2500 km/s FWHM) lines from highly ionized Ne and O. We argue
that the lines appear to originate in the outer accretion disk. Photoelectric
edges of Ne and O appear stronger than expected from interstellar material.
Recent XMM observations also suggested variability in the line morphology. We
propose to reobserve 4U1626-67 for 100 ks in order to determine variations from
the previously observed line shapes, changes in temperatures and densities, and
their dependence on pulse and binary phase.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
16:32:16.70 -67:27:42.00 4U 1626-67 ACIS-S HETG 100.00
===================================================================================
Proposal Number: 04400046
Proposal Title: HIGH RESOLUTION SPECTROSCOPY OF THE LMXB SCO X-1
PI: CLAUDE CANIZARES
Subject Category: BH AND NS BINARIES
Abstract: Sco X-1 is by far the brightest persistent extrasolar X-ray source in
the sky. Early observations showed a bright X-ray continuum and strong K (Fe XXV)
line emission. The source has been well established as an LMXB Z-source spending
most of its time on the so-called flaring branch. Low energy line emission has
been detected in the EINSTEIN OGS, which most likely arises from a photoionized
ADC. Through its variable radio emission it was established as a Galactic-jet
radio source with strong similarities to luminous radio galaxies and quasars and
we expect to observe P Cygni lines from a strong disk wind as observed in Cir
X-1. We developed a specific observation strategy that allows to safely observe
the source with the Chandra HETGS.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
16:19:55.10 -15:38:25.00 SCO X-1 ACIS-S HETG 15.00
===================================================================================
Proposal Number: 04400140
Proposal Title: MONITORING THE SPECTRAL VARIABILITY OF THE ULTRALUMINOUS X-RAY
SOURCE IN HOLMBERG IX
PI: PATRICK SLANE
Subject Category: BH AND NS BINARIES
Abstract: 1E0953.8+6918 is an ultraluminous X-ray source (ULX) residing in HoIX,
a dwarf irregular companion to M81. It is surrounded by an emission nebula which
appears to be shock heated. Recent observations indicate an association between
ULXs and starburst activity, but HoIX is a gas-poor galaxy, leaving such an
interpretation in doubt at least for this source. From our recent studies, we
have established that 1E0953.8+6918 is a point source for which we have
identified a 21st magnitude optical counterpart. Observations to date show that,
like other ULXs, 1E0953.8+6918 shows considerable flux variability on timescales
of weeks to months. Here we propose to study the spectral variations with flux in
order to better assess the nature of this ULX, and its relation to the
surrounding nebula.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
09:57:53.00 +69:03:51.00 1E0953.8+6918 ACIS-S NONE 15.00
09:57:53.00 +69:03:51.00 1E0953.8+6918 ACIS-S NONE 15.00
09:57:53.00 +69:03:51.00 1E0953.8+6918 ACIS-S NONE 15.00
===================================================================================
Proposal Number: 04400240
Proposal Title: FIRST X-RAY DETECTION OF AN ISOLATED BLACKHOLE CANDIDATE
MACHO-96-BLG-5
PI: YOSHIHITO KOBAYASHI
Subject Category: BH AND NS BINARIES
Abstract: All previously known stellar blackholes have been found as close
binaries. The MACHO team recently reported two microlensing events with
exceptionally long duration, lasting several hundred days, suggesting that the
lensing objects are isolated black holes with $\sim$6~$M_{\odot}$ each. We thus
propose a 10~ksec observation of the MACHO-96-BLG-5 lens in X-ray wavelength. By
using the superior spacial resolution of Chandra, we search the X-ray counterpart
of the lens. By testing the hardness ratio, we can test whether MACHO-96-BLG-5 is
undoubtly due to a microlensing by an isolated blackhole or not. This observation
may thus reveal that a Chandra observation of the long duration MACHO events is
aunique and powerful tool to address isolated blackhole searches.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:05:02.50 -27:42:17.00 MACHO-96-BLG-5 ACIS-S NONE 10.00
===================================================================================
Proposal Number: 04400255
Proposal Title: THE X-RAY JETS OF SS 433
PI: ROBERT FENDER
Subject Category: BH AND NS BINARIES
Abstract: In the past three years Chandra observations of X-ray jets from AGN
have advanced considerably our understanding of jet physics on large scales. SS
433 is the most famous X-ray binary jet system, and the prototypical
`microquasar'. Powerful quasi-continuous jets are observed from milliarsec- to
arsec-scales, and again on degree scales where they deform the surrounding W50
nebula. In a previous 10 ksec ACIS-S observation we have found unexpected
arcsec-scale X-ray jets, for which have been able to extract spatially-resolved
X-ray spectra revealing a hot continuum and Fe XXV emission lines, contrary to
all models for the evolution of the jet. Based on these observations and
predictions of X-ray line profiles, we request a further, deeper observation of
SS 433 with ACIS-S.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:11:49.60 +04:58:58.00 SS 433 ACIS-S NONE 60.00
===================================================================================
Proposal Number: 04400275
Proposal Title: LOCATING THE COUNTERPARTS OF THE INTRIGUING X-RAY BURSTERS
X1702-429 AND X1715-321
PI: STEFANIE WACHTER
Subject Category: BH AND NS BINARIES
Abstract: We propose to obtain accurate localizations of two intriguing X-ray
bursters with the Chandra HRC-I in an effort to establish their optical/IR
counterparts. X-ray observations alone can only provide a limited picture of
these sources and many basic characteristics of the binary system have to be
established via optical/IR observations. This project can be achieved with a
minimal amount of observing time (1 ksec for each source) and the results can be
immediately applied to already existing optical/IR data.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:06:16.80 -43:02:31.50 X1702-429 HRC-I NONE 1.00
17:18:47.30 -32:10:40.20 X1715-321 HRC-I NONE 1.00
===================================================================================
Proposal Number: 04400302
Proposal Title: LOCALIZING THE TRANSIENT 89 SECOND PULSAR XTE J1906+09
PI: RICHARD ROTHSCHILD
Subject Category: BH AND NS BINARIES
Abstract: We propose a 15 ks ACIS-I observation to yield an arcsecond position
for the transient 89-s pulsar XTE J1906+09. RXTE scans located the source within
2', and indicated a possible ~28 day sinusoidal variation in the pulse arrival
times. Recurrent transient pulsars are almost always found in high mass Be-binary
systems, but a search in Simbad reveals no O or B stars within 10'. To add to the
mystery, Corbet's P{spin}/P{orbit} correlation for recurrent transient pulsars
would predict a ~100 day orbital period, not 28 days or 2 years (the recurrence
time). The Chandra precision position will allow for identification of the
counterpart, and we will follow-up with infrared observations to determine the
characteristics of the binary system.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:05:20.00 +09:02:30.00 XTE J1906+09 ACIS-I NONE 15.00
===================================================================================
Proposal Number: 04400381
Proposal Title: X-RAY QUIESCENT COUNTERPARTS OF THE GLOBULAR CLUSTER TRANSIENTS
PI: RUDY WIJNANDS
Subject Category: BH AND NS BINARIES
Abstract: We propose to study the quiescent X-ray counterparts of bright neutron
star X-ray transients in several Galactic globular clusters. The relatively
well-known distances to those clusters make them excellent targets to study the
properties of their quiescent neutron star systems. Previous Chandra observations
of the clusters caught the transient systems in outburst, providing sub-arcsecond
positions for those transients and allowing immediate X-ray identification of
their quiescence counterparts. We will also obtain excellent data on the
low-luminosity X-ray source population of the target globular clusters which we
will use in our ongoing efforts to determine the nature of these sources.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:48:05.20 -24:46:49.00 TERZAN 5 ACIS-S NONE 40.00
17:48:52.20 -20:21:32.00 NGC 6440 ACIS-S NONE 25.00
===================================================================================
Proposal Number: 04400390
Proposal Title: LOCALIZING THE NEUTRON STAR X-RAY TRANSIENT EXO 1747-214
PI: JOHN TOMSICK
Subject Category: BH AND NS BINARIES
Abstract: We propose to use Chandra to localize the neutron star X-ray transient
EXO 1747-214 in quiescence to facilitate its identification in a deep IR image we
have obtained. We plan to perform follow-up IR and optical observations to
determine the source distance, the binary orbital parameters and the neutron star
mass. Low column density, which is important for soft X-ray and optical
observations, was a main consideration in source selection. We derive an upper
limit of 8 kpc on the source distance from the X-ray burst flux observed by
EXOSAT. A Chandra detection is likely since a non-detection will provide a
luminosity upper limit of 6E31 erg/s, which would be unusually low for a neutron
star system.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:50:25.30 -21:25:21.70 EXO 1747-214 ACIS-S NONE 25.00
===================================================================================
Proposal Number: 04400392
Proposal Title: DIAGNOSING THE ACCRETION FLOW GEOMETRY OF A GALACTIC BLACK HOLE
IN OUTBURST WITH CHANDRA
PI: WALTER LEWIN
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 and optical observations from approved programs around the globe.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
TOO ACIS-S HETG 50.00
TOO ACIS-S HETG 50.00
TOO ACIS-S HETG 50.00
TOO ACIS-S HETG 50.00
===================================================================================
Proposal Number: 04400494
Proposal Title: PROBING THE ACCRETION GEOMETRY OF A QUIESCENT BLACK HOLE
PI: ROBERT HYNES
Subject Category: BH AND NS BINARIES
Abstract: Advective accretion is invoked to explain low luminosity accretion onto
both stellar mass and supermassive black holes. There has been much theoretical
activity, and controversy, but observational constraints are weak. We have found
considerable X-ray and optical variability. The similarity of timescales and
amplitudes, and the emission line kinematics all suggest that the optical
variability is driven by X-ray illumination of the accretion disc. We now propose
the first simultaneous X-ray and optical observations to test if the variations
are correlated and measure relative amplitudes. Our program will yield new
constraints upon the models, as the strength of the optical emission line
response is sensitive to the unobservable EUV spectrum, and to the X-ray emission
geometry.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
20:24:03.80 +33:52:02.10 V404 CYG ACIS-S NONE 60.00
===================================================================================
Proposal Number: 04400516
Proposal Title: THE FAINTEST 'FIELD' LOW-MASS X-RAY BINARIES
PI: MICHIEL VAN DER KLIS
Subject Category: BH AND NS BINARIES
Abstract: We propose to continue our survey, begun in Cycle 1, of the group of
persistently faint galactic X-ray sources outside globular clusters which are
thought to be LMXBs, but about which very little was known before Chandra. Our
exploratory Cycle 1 work confirmed the low Lx of these objects, and produced some
intriguing new results which we will follow up with observations approved in
Cycle 3. Given theoretical as well as empirical arguments for the detection of
spectral lines, in Cycle 4 we propose follow-up ACIS-S CC observations for 2
sources, and 1 deep imaging observation. Our aim is to extend knowledge about
compact-object accretion physics towards lower accretion levels than previously
accessible and to provide a sample against which to compare the faint
globular-cluster LMXBs.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:38:17.10 -26:59:38.60 1735-269 ACIS-S NONE 40.00
===================================================================================
Proposal Number: 04400555
Proposal Title: FINDING BLACK HOLES AND UNDERSTANDING STAR CLUSTER EVOLUTION
WITH CHANDRA
PI: SIMON PORTEGIES ZWART
Subject Category: BH AND NS BINARIES
Abstract: The Large Magellanic Cloud contains an interesting population of star
clusters with a range in ages (~< 100 Myr), richnesses (10^4 to 10^5 stars), and
densities (up to 10^4 star/pc^3) unlike any clusters in the Milky Way. Recent
theoretical models predict these clusters to 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 propose to observe six such clusters (in 4 pointings of 30 ks
each) to a detection threshold of 1.5 times 10^32 erg/s (a sensitivity about 1000
times better than current limits). The wide parameter ranges of the selected
clusters will allow us to put important constraints on dynamical models of star
clusters and on the theoretical predictions concerning the formation and
evolution of BHXBs.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:08:44.00 -68:45:36.00 NGC 1850 A/B ACIS-S NONE 30.00
===================================================================================
Proposal Number: 04400554
Proposal Title: A CHANDRA SNAPSHOT OBSERVATION OF AX J1226.8--6249: A HIGH MASS
X-RAY BINARY PRODUCING A BOW-SHOCK NEBULA ?
PI: STEPHEN EIKENBERRY
Subject Category: BH AND NS BINARIES
Abstract: We propose a 3-kilosecond ACIS-S observation toward the unidentified
X-ray source AX J1226.8-6249. This object is located close to a newly discovered
mid-infrared bow-shock nebula, and we find that it is highly probable that AX
J1226.8-6249 is in fact a Be/X-ray runaway binary, producing a bow shock via its
supersonic motion. Our proposed ACIS-S observation will enable us to estimate the
position of the source with arcsecond accuracy, which will be crucial to
understanding the nature of the source by determining the validity of the
Be/X-ray binary hypothesis and the origin of the bow shock. If confirmed, AX
J1226.8-6249 will be the first Be/X-ray binary observed with a bow shock, and
only the second bow shock system (after Vela X-1) from all high-mass X-ray
binaries.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
12:26:52.80 -62:49:07.00 AX J1226.8-6249 ACIS-S NONE 3.00
===================================================================================
Proposal Number: 04400563
Proposal Title: UNDERSTANDING THE EXTENDED EMISSION IN CYGNUS X-3
PI: WILLIAM HEINDL
Subject Category: BH AND NS BINARIES
Abstract: We propose to observe the microquasar Cyg X-3 during a low X-ray state
in order to study extended, jet-like emission which we have discovered in
archival ACIS-S/HETG observations. Cyg X-3 is a binary system with a neutron star
or black hole primary and a Wolf-Rayet companion. By using the ACIS-S without
gratings, we will obtain a CCD spectrum of the extension. In order to understand
the nature of the extension, we will measure the continuum shape and search for
reflected emission lines from the intense Wolf-Rayet stellar wind. A second
observation with the HRC-I will provide the highest angular resolution possible
with Chandra, allowing us to study the extension close to the compact object
(where the ACIS image will be severely piled up) where matter may be ejected from
the system.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
20:32:25.50 +40:57:27.70 CYG X-3 HRC-I NONE 15.00
===================================================================================
Proposal Number: 04400587
Proposal Title: PURSUING HINTS OF MULTIPLICITY IN M31 GLOBULAR CLUSTER BO 375
PI: ALBERT KONG
Subject Category: BH AND NS BINARIES
Abstract: Bo 375 in M31 contains one of the most luminous ($2-5 \times 10^{38}$
erg s$^{-1}$) globular cluster X-ray sources in the Local Group. In a recent
ACIS-S survey, we discovered that the source may be extended. We request one 5
ksec HRC-I observation to test whether the source can be resolved and one 10 ksec
observation with ACIS-S to study its spectrum, which is heavily piled up in the
survey data. The observations we propose will help determine if Bo 375 houses
multiple bright sources and will provide input for physical models. We also
request HST observations (1 orbit) to study the morphology of the cluster.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
00:45:45.60 +41:39:45.20 BO 375 HRC-I NONE 5.00
===================================================================================
Proposal Number: 04400674
Proposal Title: CYGNUS X-1: X-RAY DIPS, DISTANCE, AND THE X-RAY HALO
PI: KATJA POTTSCHMIDT
Subject Category: BH AND NS BINARIES
Abstract: We propose a 50 ks HETG observation of the soft X-ray halo of Cyg X-1.
The 0th order image of Cyg~X-1 will be blocked out (to avoid telemetry
saturation). The observation will be scheduled during upper conjunction of the
black hole, when pronounced soft X-ray absorption dips occur. Measurements of
such flux variability mirrored at different annuli of the halo will place
constraints on the distance and extent of the scattering dust cloud, as well as
cross-check existing distance determinations for Cyg X-1 itself. The HETG
spectrum of Cyg X-1 can be expected to show signatures of the widely unknown
focused stellar wind of the O-star that is responsible for the absorption dips.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:58:21.70 +35:12:06.30 CYG X-1 ACIS-S HETG 50.00
===================================================================================
Proposal Number: 04400676
Proposal Title: RESOLVING THE LOW/HARD STATE OF CYGNUS X-1 WITH CHANDRA
PI: WALTER LEWIN
Subject Category: BH AND NS BINARIES
Abstract: Galactic black holes with relativistic radio jets are called
microquasars. These systems are seen at high inclination, partially obscuring
their central accretion engine. Cygnus X-1 is seen relatively face-on; it might
be regarded as a micro-Seyfert-1, and this may explain why a broad Fe K-alpha
emission line consistent with emission from the inner disk is often observed in
this source. We request a 60 ksec HETGS observation of Cygnus X-1 in the low/hard
state to diagnose its accretion flow geometry in this state through precise Fe K
alpha line spectroscopy. We will examine the nature of the companion wind via
highly ionized absorption lines, to constrain its role in feeding the central
engine. We will make simultaneous RXTE (2-250 keV) and Integral (3 keV - 10 MeV)
observations.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:58:21.70 +35:12:05.80 CYGNUS X-1 ACIS-S HETG 60.00
===================================================================================
Proposal Number: 04400771
Proposal Title: THE ULTRALUMINOUS X-RAY SOURCE IN HOLMBERG II
PI: PHILIP KAARET
Subject Category: BH AND NS BINARIES
Abstract: We propose to a program of Chandra and HST observations to test the
recent suggestion that the bright X-ray source in Holmberg II is surrounded by a
photoionization nebula powered by a central object with a luminosity of order
10^40 erg/s.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
08:19:29.70 +70:42:19.40 HOLMBERG II ULX HRC-I NONE 5.00
===================================================================================
Proposal Number: 04400900
Proposal Title: DUSTY SHOCKS AND PULSAR WINDS: IDENTIFYING THE SOURCE MODEL FOR
G70.7+1.2
PI: ZAVEN ARZOUMANIAN
Subject Category: BH AND NS BINARIES
Abstract: The optical and radio nebula G70.7+1.2 has been the object of scrutiny
and speculation for more than 50 years. In the last decade, unexpected
discoveries made through multiwavelength observations have helped to discredit
successive models of the object's nature and the mechanisms at work within it.
Two models that explain most of the observed phenomena remain, one requiring a
central Be-neutron star binary, the other a single star with a dusty wind. They
make specific, distinct predictions for X-ray emission from the system. We
propose to use the sensitivity and spatial resolution of Chandra's ACIS-S camera
to discriminate between these two models, revealing at last the true nature of
G70.7+1.2, and providing a unique new laboratory for testing models of bow-shock
formation.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
20:04:23.60 +33:39:04.00 G70.7+1.2 ACIS-S NONE 40.00
===================================================================================
Proposal Number: 04400812
Proposal Title: A SEARCH FOR X-RAY EMISSION FROM OGLE-1999-BUL-32: THE "MISSING
LINK" BETWEEN STELLAR MASS AND SUPERMASSIVE BLACK HOLES
PI: W. THOMAS VESTRAND
Subject Category: BH AND NS BINARIES
Abstract: Straightforward interpretation of the spectacular new microlensing
event OGLE-1999-BUL-32 indicates that the lens is either a 130 solar mass black
hole at 500 pc or a 30 solar mass black hole at 6 kpc. We request a 50-ksec ACIS
observation that will yield a limiting X-ray sensitivity which is more than two
orders of magnitude deeper than the best existing limits. If detected, the
observations would be powerful evidence for a class of isolated black holes with
masses between those of stellar mass in X-ray binary systems and the supermassive
black holes resident in the nuclei of galaxies.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:05:05.30 -28:34:42.50 OGLE-1999-BUL-32 ACIS-S NONE 10.00
===================================================================================
Proposal Number: 04400831
Proposal Title: QUIESCENT EMISSION FROM TRANSIENT ACCRETION-POWERED PULSARS
PI: LARS BILDSTEN
Subject Category: BH AND NS BINARIES
Abstract: We propose to study the quiescent emission from transiently accreting
X-ray pulsars. Reactions in the neutron star (NS) crust maintain the core at a
temperature sufficient to make the NS emit a minimum thermal luminosity
comparable to that observed in low-B transients; thus, we will detect sources in
quiescence for the first time, at predicted fluxes. Using magnetic atmosphere
models, we will measure the implied emission area radii, to compare with those
measured from low-B transients. We will search for pulsations at the known
periods, to constrain the fraction of the quiescent luminosity contributed by
surface thermal emission, and spectrally disentangle the thermal emission from
other emission mechanisms, such as accretion onto the NS magnetosphere.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
11:20:57.20 -61:55:00.30 A1118-616 ACIS-S NONE 20.00
11:48:00.00 -62:12:24.90 4U 1145-619 ACIS-S NONE 23.00
===================================================================================
Proposal Number: 04400982
Proposal Title: X-RAY TRANSMISSION SPECTROSCOPY DURING THE STAR-RISE OF HER X-1
PI: MARIO JIMENEZ-GARATE
Subject Category: BH AND NS BINARIES
Abstract: We propose to observe Her X-1 at the time in which the neutron star
rises above the edge of the accretion disk. This phenomenon is due to disk
precession. The enhanced line-of-sight optical depth from the disk atmosphere and
corona will allow the detection of absorption edges and/or resonance lines, from
species such as N VII, O VIII, Ne X, Mg XII, SI XIV, and Fe XXV, which we can use
to determine the disk ionization structure, the elemental composition, the gas
dynamics, and column density. The pre-rise and post-rise epochs likely exhibit
line features from the disk and corona, and are best to search for P Cygni
profiles from an equatorial disk-wind.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
16:57:50.50 +35:20:52.00 HER X-1 ACIS-S HETG 30.00
16:57:50.50 +35:20:52.00 HER X-1 ACIS-S HETG 30.00
===================================================================================
Proposal Number: 04400983
Proposal Title: EXPLORING ACCRETION DISKS: THE LINE-RICH SPECTRA OF X-RAY BINARY
DIPPERS
PI: MARIO JIMENEZ-GARATE
Subject Category: BH AND NS BINARIES
Abstract: We propose to obtain HETG spectra for two low-mass X-ray binary (LMXB)
dippers, which likely exhibit prominent emission lines. Observations during the
dip (or absorbed) phases, are equivalent to taking a "disk-coronagraph", which
allows us to probe any circumsource structure. Using high-resolution
spectroscopy, we can determine element abundance ratios, density, temperature,
and measure emission-line profiles. With 4U1254-69 and 4U1323-619, we will
complete the observed sample of bright, high-inclination LMXB, which will advance
our understanding of their accretion disks.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
12:57:37.20 -69:17:21.00 4U1254-690 ACIS-S HETG 55.00
===================================================================================
Proposal Number: 04400876
Proposal Title: SNAPSHOT SURVEY OF FOUR LMXBS
PI: DEEPTO CHAKRABARTY
Subject Category: BH AND NS BINARIES
Abstract: We request short snapshot observations of four LMXBs with ACIS/HETGS to
further three independent science investigations. (1) We will measure the
spectrum of 4U1822-000 and 4U1905+000 to test the hypothesis that they are
ultracompact binaries. (2) We will measure the position of the X-ray burster
4U1702-429 in order to facilitate identification of its optical counterpart. (3)
We will measure the position of the suspected symbiotic X-ray binary 4U1700+24 in
order to test its association with a nearby red giant. In all four cases, we will
combine our Chandra analysis with existing or approved ground-based optical/IR
observations.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:25:22.00 +00:04:14.10 4U 1822-000 ACIS-S HETG 2.00
19:08:27.00 +00:10:07.60 4U 1905+000 ACIS-S HETG 5.00
===================================================================================
Proposal Number: 04400014
Proposal Title: NEUTRON STARS IN QUIESCENCE
PI: STEPHEN MURRAY
Subject Category: BH AND NS BINARIES
Abstract: In order to distingush the effects of an event horizon associated with
a black hole from a surface associated with a neutron star, we must compare their
X-ray luminosities when in quiescence. Very few neutron star binaries have been
detected, we plan to remedy this.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
16:03:54.00 -77:53:06.00 SAX J1603.9-7753 ACIS-S NONE 16.00
17:09:50.40 -26:37:06.70 XTE J1709-267 ACIS-I NONE 24.00
17:14:19.20 -34:02:58.00 2S1711-339 ACIS-S NONE 25.00
17:48:13.40 -36:07:53.00 A1744-361 ACIS-S NONE 16.00
17:58:40.00 -33:48:27.00 4U1755-33 ACIS-S NONE 24.00
===================================================================================
Proposal Number: 04400991
Proposal Title: ``QPO-FOLDED'' SPECTROSCOPIC OF THE LOW-MASS X-RAY BINARY AND
DIPPER 4U 1323-62
PI: MARIANO MENDEZ
Subject Category: BH AND NS BINARIES
Abstract: We will use Chandra's ACIS-S detector in combination with the HETGS to
do phase-resolved spectroscopy of the low-mass X-ray binary and dipper 4U
1323-62. Using the 1-Hz QPO that we recently discovered in this source we will
construct ``QPO-folded'' light curves to study separately spectra from different
QPO-phase intervals. We will correlate the presence/absence of emission and
absorption features in the energy spectrum of Chandra with timing properties
measured both by Chandra, and (already approved) simultaneous RXTE observations.
This should help us determine how timing properties depend on mass accretion
rate, and whether mass flows onto the central object through different channels
of accretion.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
13:26:36.10 -62:08:10.00 4U 1323-619 ACIS-S HETG 40.00
===================================================================================
Proposal Number: 04400096
Proposal Title: SOFT X-RAY EMISSION FROM X-RAY BINARIES
PI: MARIANO MENDEZ
Subject Category: BH AND NS BINARIES
Abstract: We will use Chandra's LETG/HRC-S to observe the neutron star binary EXO
0748-676 and the black-hole candidate Cyg X-1. We will correlate the
presence/absence of emission and absorption features in the energy spectrum of
Chandra with timing properties measured both by Chandra, and simultaneous RXTE
observations.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
07:48:33.30 -67:45:00.00 EXO 0748-676 HRC-S LETG 40.00
===================================================================================
Proposal Number: 04400159
Proposal Title: FAINT NEUTRON STAR SOFT X-RAY TRANSIENTS IN QUIESCENCE
PI: PETER JONKER
Subject Category: BH AND NS BINARIES
Abstract: It has been proposed that the magnetic fields of faint soft X-ray
transients (SXTs) are not buried by the accreted matter. This would explain why
SAX J1808.4-3658 shows pulsations and brighter SXTs don't. So far the only
property separating SAX J1808.4-3658 from other SXTs is its low quiescent
luminosity. Therefore, a quiescent luminosity as low as that of SAX J1808.4-3658
may be the tell-tale sign of systems showing pulsations when matter is accreting.
We propose to obtain ACIS-S observations of two faint SXTs in quiescence. These
observations will show whether the quiescent luminosity of the faint neutron star
SXTs is indeed lower than those of bright neutron star SXTs such as e.g. Cen X-4.
To achieve this the low interstellar absorption toward the selected sources is
important.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:10:44.40 -26:08:60.00 SAX J1810.8-2609 ACIS-S NONE 35.00
===================================================================================
Proposal Number: 04408136
Proposal Title: AN HETGS OBSERVATION OF GX 339-4 IN THE LOW/HARD STATE:
ACCRETION GEOMETRY, RELATIVITY, AND JET FORMATION
PI: JON MILLER
Subject Category: BH AND NS BINARIES
Abstract: [The full SJ is contained in an email to the director.] A sensitive
spectrum of a transient Galactic black hole in the low/hard state can address at
least 3 of the most fundamental issues in X-ray astronomy: 1) major pictures for
changes in accretion flow geometry with the mass accretion rate (m-dot), 2)
relativistic effects near black holes, and 3) jet formation. GX 339-4 is an ideal
target for this purpose. At present, grating spectra and even CCD spectra
obtained from sources in this state have collected < 10^4 counts each (in the
best cases), insufficient for strong constraints. Our proposed grating
observation will obtain appx 10^6 counts in the dispersed spectrum. We will use
continuum spectroscopy and the shape of the Fe K-alpha line to constrain the
radial location of the inner disk, and thereby the nature of the flow geometry
and the role of the disk in jet formation in the low/hard state.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:02:49.50 -48:47:23.00 GX 339-4 ACIS-S HETG 75.00
===================================================================================
Proposal Number: 04408138
Proposal Title: THE BHC SOFT X-RAY TRANSIENT XTE J1908+094 RETURNING TO
QUIESCENCE
PI: PETER JONKER
Subject Category: BH AND NS BINARIES
Abstract: With the Chandra satellite we can study the spectra of SXTs as they
fade into quiescence. This has never been done for a BHC SXT! According to
evolutionary and SXT outburst theories there may exist a whole class of
persistent but faint accreting BHCs at low Mdot; their accretion disk is cold and
hence not prone to the SXT outburst mechanism. Up to now there is very few
information on spectral states for BHCs for ~2 orders of magnitude in flux
(~10^-7-10^-5 Edd.; there is spectral information of BHCs in quiescence at ~10^-8
of Edd.). Gallo et al. 2003 have demonstrated the existence of a universal
coupling between observed X-ray and radio flux from hard state BHCs, of the form
L_radio~L_X^0.7, over three orders of magnitude. We propose to extend this
relation down to ~5x10^-7 Edd. assuming d=10 kpc. This would demonstrate that jet
production is the standard behavior and it is only in the limited range in Mdot
in which a standard thin disc is formed that a jet is not produced.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:08:53.80 +09:23:04.90 XTE J1908+094 ACIS-S NONE 5.00
19:08:53.80 +09:23:04.90 XTE J1908+094 ACIS-S NONE 10.00
19:08:53.80 +09:23:04.90 XTE J1908+094 ACIS-S NONE 15.00
===================================================================================
Proposal Number: 04408141
Proposal Title: DETERMINATION OF THE POSITION OF THE MILLISECOND PULSAR XTE
J1807-294
PI: CRAIG MARKWARDT
Subject Category: BH AND NS BINARIES
Abstract: Millisecond pulsars are probably the endpoint of evolution of low mass
X-ray binaries (LMXBs). However, the actual detection of neutron star spin
frequencies in LMXBs has been problematic. To date, four accreting millisecond
pulsars have been found, with the fourth, XTE J1807-294 having been discovered 25
Feb 2003. Three of the four known pulsars have orbital periods of 35-43 min,
which suggests that there is a common evolutionary origin. We request Chandra
HRC-S observations in "Imaging Mode" primarily to determine the position. This
will enable observations at other wavelengths. Detection of an optical
counterpart of XTE J1807-294, in outburst or quiescence, can aid in determining
the system size and inclination, but because of the confused galactic center
region, it is important to have a precise a priori position.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:07:00.34 -29:24:18.32 XTE J1807-294 HRC-S NONE 3.00
***********************************************************************************
SN, SNR AND ISOLATED NS
--------------------------------------------------
===================================================================================
Proposal Number: 04500003
Proposal Title: THE ORIGIN OF GAMMA-RAY BURSTS
PI: ANDREW FRUCHTER
Subject Category: SN, SNR AND ISOLATED NS
Abstract: The rapid and accurate localization of gamma-ray bursts (GRBs) promised
by a working HETE-2 during the coming year may well revolutionize our ability to
study these enigmatic, highly luminous transients. We propose a program of HST
and Chandra observations to capitalize on this extraordinary opportunity. We will
perform some of the most stringent tests yet of the standard model, in which GRBs
represent collimated relativistic outflows from collapsing massive stars. NICMOS
imaging and STIS CCD spectroscopy will detect broad atomic features of supernovae
underlying GRB optical transients, at luminosities more than three times fainter
than SN 1998bw. Chandra spectroscopy will investigate whether the GRB X-ray lines
are from metals freshly ripped from the stellar core by the GRB.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
GRB ACIS-S HETG 100.00
===================================================================================
Proposal Number: 04500008
Proposal Title: SNR E0102-72: COMPLETING THE PICTURE
PI: CLAUDE CANIZARES
Subject Category: SN, SNR AND ISOLATED NS
Abstract: Chandra HETG observations of the SNR E0102-72 in the SMC reveal ejecta
velocities of ~1000 km/sec and suggest pregressive ionization due to the reverse
shock. These data have allowed us to generate a velocity map of the SNR, a
crucial ingredient for creating a model of the 3D structure of the remnant. By
observating the SNR at a second roll roughly orthogonal to the first, we will be
able to complete this velocity map and refine our 3D model. Further, we will be
able to extend our examination of the ionization structure and the radial profile
at the reverse shock front.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
01:03:60.00 -72:01:56.00 1E0102.2-7219 ACIS-S HETG 140.00
===================================================================================
Proposal Number: 04500018
Proposal Title: MONITORING THE BIRTH OF SUPERNOVA REMNANT SNR1987A
PI: DAVID BURROWS
Subject Category: SN, SNR AND ISOLATED NS
Abstract: SNR1987A presents a unique opportunity to observe the birth and early
evolution of a supernova remnant at high spatial resolution. Chandra affords the
opportunity to monitor the expansion and evolution of this remnant with high
resolution X-ray images and spatially-resolved spectra. This proposal continues
our program of regular observations of SNR1987A. We propose two 50 ks monitoring
observations in AO4, spaced 6 months apart, to study the interaction of the blast
wave with the circumstellar ring/disk.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:35:28.00 -69:16:11.10 SNR1987A ACIS-S NONE 25.00
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: 04500034
Proposal Title: SIMULTANEOUS X-RAY AND OPTICAL HIGH SPEED PHOTOMETRY OF THE CRAB
PULSAR
PI: PETER PREDEHL
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose to obtain contemporaneous X-ray and Optical observations of
the Crab pulsar in order to determine the relative phase between the X-ray and
optical pulses. Optical observations will be performed at Skinakas observatory of
the university of Crete, Greece, using MPE's high speed optical photometer OPTIMA
which provides an absolute time accuracy of 2-4 microseconds. In the HRC-S timing
mode which we plan to use the accuracy to measure the X-ray pulse arriv l time is
100 microseconds. This is the first experiment which aims to determine the
relative phase between the optical and X-ray wave bands.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
05:34:32.00 +22:00:52.00 CRAB PULSAR HRC-S LETG 10.00
===================================================================================
Proposal Number: 04500051
Proposal Title: OBSERVATION OF SNR G11.4-0.1
PI: GORDON GARMIRE
Subject Category: SN, SNR AND ISOLATED NS
Abstract: X-ray study of a distant SNR to explore whether a shell or comppsite
remnant.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
18:10:47.00 -19:04:60.00 G11.4-0.1 ACIS-I NONE 20.00
===================================================================================
Proposal Number: 04500062
Proposal Title: ALTERNATE-PSR J1509-5850 : "VELA-LIKE" PULSAR FOUND IN THE
PARKES MULTIBEAM PULSAR SURVEY
PI: GORDON GARMIRE
Subject Category: SN, SNR AND ISOLATED NS
Abstract: The goal of this observation is to measure the X-ray spectrum of PSR
J1509-5850 and detect its Pulsar Wind Nebula.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
15:09:27.10 -58:50:56.00 PSR J1509-5850 ACIS-S NONE 40.00
===================================================================================
Proposal Number: 04500141
Proposal Title: A DETAILED STUDY OF 3C58 - THE YOUNGEST KNOWN PULSAR NEBULA IN
THE GALAXY
PI: PATRICK SLANE
Subject Category: SN, SNR AND ISOLATED NS
Abstract: 3C58 is the youngest known Crab-like SNR in the Galaxy. Chandra
observations have uncovered its young pulsar, provided an upper limit to its
surface temperature which challenges standard models of NS cooling, and
identified the termination shock of its wind. Structures in the nebula indicative
of jets and particle outflows have also been revealed. 3C58 thus possesses all of
the standard traits of a young pulsar system, and may be a more appropriate
"prototype" than the Crab. Based on the foundation built from our initial
studies, we propose a definitive X-ray study of 3C58 to study structure on scales
of the telescope resolution, perform spectral mapping of the complex emission
regions, and obtain a template for future studies of this remnant of SN 1181 at
other wavelengths.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
02:05:37.90 +64:49:41.76 3C58 ACIS-S NONE 150.00
02:05:37.90 +64:49:41.76 3C58 ACIS-S NONE 50.00
02:05:37.90 +64:49:41.76 3C58 ACIS-S NONE 150.00
===================================================================================
Proposal Number: 04500164
Proposal Title: MULTI-EPOCH OBSERVATIONS OF PSR B1509-58 AND ITS NEBULA
PI: BRYAN GAENSLER
Subject Category: SN, SNR AND ISOLATED NS
Abstract: Chandra observations of the Crab and Vela pulsars have revealed many
remarkable and unexpected features in their nebulae, allowing us to make major
progress in our understanding of pulsar winds. Our AO-1 observations of the young
pulsar PSR B1509-58 show it to power a large and bright nebula containing many
complex features, demonstrating this source to be the obvious next target worthy
of detailed study. We therefore propose Chandra observations of PSR B1509-58 at
four additional epochs, with the aim of measuring changes in the brightness,
morphology and position of the nebular features as a function of time. These data
will allow us to make detailed comparisons to our proposed models for the
time-dependent evolution of the pulsar's wind.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
15:13:55.60 -59:08:09.20 PSR B1509-58 ACIS-I NONE 9.62
15:13:55.60 -59:08:09.20 PSR B1509-58 ACIS-I NONE 9.62
15:13:55.60 -59:08:09.20 PSR B1509-58 ACIS-I NONE 19.25
===================================================================================
Proposal Number: 04500172
Proposal Title: IMAGING AND SPECTROSCOPY OF THE PULSAR EXPECTED IN CTA1
PI: JULES HALPERN
Subject Category: SN, SNR AND ISOLATED NS
Abstract: The supernova remnant CTA1 that falls within the error box of the EGRET
source 3EG J0010+7309 contains one of the best X-ray candidates for a radio-quiet
gamma-ray pulsar. The superb imaging capability of Chandra can resolve the
neutron star in the X-ray source RX J0007.0+7303 from its pulsar wind nebula
(PWN), thus enabling a simultaneous study of the structure of the PWN, and the
energetics of both thermal and nonthermal spectra from the pulsar itself. These
results should motivate follow-up observations, as Chandra has done before, that
may finally discover the pulsations. We have also obtained deep images of this
field in B, V, and R, that can be used to search for the optical counterpart of
the pulsar once the precise X-ray position is determined by Chandra.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
00:07:00.00 +73:03:03.00 RX J0007.0+7303 ACIS-S NONE 50.00
===================================================================================
Proposal Number: 04500174
Proposal Title: REVEALING THE PULSAR COUNTERPARTS OF EGRET SOURCES
PI: JULES HALPERN
Subject Category: SN, SNR AND ISOLATED NS
Abstract: Empowered by the superb imaging performance of Chandra, we are making
good progress in determining the nature of the persistent high-energy gamma-ray
sources in the Galaxy. Young pulsar counterparts are being found directly by
resolving point sources within synchrotron nebulae to distances of 2-4 kpc, where
the most luminous EGRET sources reside. At intermediate Galactic latitudes,
precise Chandra astrometry is establishing the existence of nearby, older neutron
stars, by the absence of optical counterparts. Following our successes using both
of these methods, we propose to pinpoint a set of previously studied candidates,
which will make a significant addition to the population of young, energetic
pulsars, and/or nearby older neutron stars that are also efficient gamma-ray
pulsars.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
20:35:40.00 +42:22:60.00 GEV J2035+4214 ACIS-I NONE 20.00
===================================================================================
Proposal Number: 04500223
Proposal Title: STUDYING HIGH MACH NUMBER SHOCKS IN YOUNG SUPERNOVA REMNANTS
WITH CHANDRA
PI: JOHN HUGHES
Subject Category: SN, SNR AND ISOLATED NS
Abstract: We propose deep imaging of the full extents of the young supernova
remnants SN1006, Tycho, and G292.0+1.8. These images are optimized for proper
motion measurements for which Chandra's superb angular resolution is uniquely
suited and will yield significant results when compared to earlier Chandra,
ROSAT, and Einstein images. The new X-ray data, in conjunction with our new radio
observations, will address questions concerning the physics of
ultra-high-Mach-number collisionless shocks, the efficiency of cosmic-ray
acceleration, the dynamics of ejecta-dominated SNRs, and the small-scale
structure of SN ejecta. These observations will serve as a legacy of the Chandra
mission and will provide invaluable data for future research on SNRs and cosmic
rays.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
00:25:19.00 +64:08:10.00 TYCHO'S SNR ACIS-I NONE 150.00
15:02:55.00 -41:55:30.00 SN1006 ACIS-I NONE 20.00
15:02:55.00 -41:55:30.00 SN1006 ACIS-I NONE 20.00
15:02:55.00 -41:55:30.00 SN1006 ACIS-I NONE 20.00
15:02:55.00 -41:55:30.00 SN1006 ACIS-I NONE 20.00
15:02:55.00 -41:55:30.00 SN1006 ACIS-I NONE 20.00
15:02:55.00 -41:55:30.00 SN1006 ACIS-I NONE 20.00
15:02:55.00 -41:55:30.00 SN1006 ACIS-I NONE 20.00
15:02:55.00 -41:55:30.00 SN1006 ACIS-I NONE 20.00
15:02:55.00 -41:55:30.00 SN1006 ACIS-I NONE 20.00
15:02:55.00 -41:55:30.00 SN1006 ACIS-I NONE 20.00
15:02:55.00 -41:55:30.00 SN1006 ACIS-I NONE 20.00
===================================================================================
Proposal Number: 04500227
Proposal Title: SUPERNOVA REMNANT(S) AND STAR-FORMING REGIONS IN THE W51 COMPLEX
PI: BON-CHUL KOO
Subject Category: SN, SNR AND ISOLATED NS
Abstract: W51B+C is one of the few regions in the Galaxy where we can study the
formation of massive stars and the consequence of their violent explosions
simultaneously. It is composed of an active star forming region, W51B, and an old
SNR, W51C. There is strong evidence suggesting that the SNR is interacting with
the star-forming molecular clouds. We propose 2 short pointings at the central
region of the SNR to search for pulsars and evaporating molecular clumps. A third
pointing at the adjacent star-forming region W51B will locate stellar X-ray
sources, and will distinguish the X-rays associated with the star-forming region
from the X-rays associated with the SNR.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:22:28.00 +14:04:60.00 W51B ACIS-I NONE 30.00
19:22:60.00 +14:15:00.00 W51 NORTH ACIS-I NONE 12.00
19:23:30.00 +14:04:60.00 W51 SOUTH ACIS-I NONE 12.00
===================================================================================
Proposal Number: 04500228
Proposal Title: THE X-RAY NEBULA OF PSR B1046-58
PI: VICTORIA KASPI
Subject Category: SN, SNR AND ISOLATED NS
Abstract: Pulsar wind nebulae (PWNe), well studied with Chandra, are a result of
confinement of the relativistic wind produced by rotation-powered pulsars. In
sources studied thus far, confinement is by either the high pressure in the
interior of a supernova remnant, or of ram-pressure due to the pulsar velocity
and ambient density. Here we request 36~ks of ACIS time to study the PWN around
the young, energetic pulsar PSR B1046-58. This PWN, according to basic reasoning,
should not exist, as there is no obvious wind confinement mechanism. Yet ASCA
observations reveal a relatively bright nebula. Using Chandra's high spatial
resolution, we will, for the first, time, resolve the features in this PWN, in
order to solve the mystery and determine how this PWN is produced.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
10:48:12.20 -58:32:05.80 PSR B1046-58 ACIS-S NONE 36.00
===================================================================================
Proposal Number: 04500301
Proposal Title: A JET-CLOUD INTERACTION IN W50: THE GALACTIC MICRO-QUASAR
ASSOCIATED WITH SS 433
PI: SAMAR SAFI-HARB
Subject Category: SN, SNR AND ISOLATED NS
Abstract: W50 is the only Galactic supernova remnant known to harbor a binary
twin-jet compact object: SS 433. Our study of this fascinating SNR reveals two
X-ray lobes having a knotty morphology. In the western lobe, we have evidence
(from a multiwavelength campaign) of a cloud interacting with SS433's receding
jet. We propose a 75 ksec ACIS-I pointing at the peak of W50-west to 1) spatially
resolve thermal and non-thermal emission in the shock-excited regions, and 2)
search for arcsecond-scale shock structures expected from the deposition of
energy of a fast moving jet into a cloud. Chandra will provide an exquisite image
and a good understanding of a Galactic micro-quasar, whose study provides a
bridge from the smallest scale nebulae to the extragalactic radio jets.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
19:09:45.00 +05:01:29.00 W50-WEST ACIS-I NONE 75.00
===================================================================================
Proposal Number: 04500320
Proposal Title: SUPERNOVA REMNANTS: HOMES FOR YOUNG NEUTRON STARS
PI: DAVID HELFAND
Subject Category: SN, SNR AND ISOLATED NS
Abstract: Composite supernova remnants are the expected products of Type II
supernovae, yet they comprise less than 15% of the known remnants in the Galaxy.
The range of synchrotron core parameters provide a crucial window on the physics
of stellar collapse, while the surrounding shell offers an age estimate as well
as an assay of the elements produced in the explosion. G16.7+0.1 & G351.2+0.1 are
small-diameter composite remnants containing weak radio cores; the former has
recently been detected with XMM, while mid-infrared observations of the latter
show that its inverted radio spectral index extends at least to 20 microns. We
propose to observe both remnants in order to define the nature of their pulsar
wind nebulae and to constrain the parameters of the neutron stars which power
them.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
17:22:24.70 -36:10:60.00 G351.2+0.1 ACIS-S NONE 15.00
18:20:57.80 -14:20:09.60 G16.7+0.1 ACIS-S NONE 25.00
===================================================================================
Proposal Number: 04500326
Proposal Title: A STUDY OF THE X-RAY LUMINOUS NORTHWESTERN RIM OF THE GALACTIC
SUPERNOVA REMNANT G266.2-1.2
PI: THOMAS PANNUTI
Subject Category: SN, SNR AND ISOLATED NS
Abstract: G266.2-1.2 is a young shell-type supernova remnant with an X-ray
spectrum dominated by non-thermal emission. Previous X-ray studies of this
remnant by ASCA and ROSAT revealed that the northwestern rim of G266.2-1.2 is
particularly luminous, but these observations lacked the capability of resolving
this rim and the true nature of the rim's spectrum (thermal or non-thermal) has
been debated. To investigate this rim in more detail, we propose to conduct a
high-resolution observation using Chandra. it is very likely that the rim is a
site of cosmic-ray acceleration, and the data will be analyzed to study this
phenomenon in detail. We will also search for thermal emission from smaller
structures within the rim to take advantage of Chandra's unprecedented high
angular resolution capabilities.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
-----------------------------------------------------------------------------------
08:49:07.92 -45:37:44.40 G266.2-1.2 - NW ACIS-S NONE 35.00
08:49:07.92 -45:37:44.40 G266.2-1.2 - NW ACIS-S NONE 40.00
===================================================================================
Proposal Number: 04500278
Proposal Title: SUPERNOVA REMNANTS IN THE MAGELLANIC CLOUDS
PI: FREDERICK SEWARD
Subject Category: SN, SNR AND ISOLATED NS
Abstract: Chandra has now observed 20 of the brightest remnants in the Magellanic
Clouds. Because the distances are known and the absorption low, this set is going
to yield definitive data on remnant characteristics and evolution. We propose to
observe 6 more remnants in the LMC. All are fainter and some are larger than
those in the observed sample. We expect to see faint central sources and
previously unobserved structure. These observations will span a region of
parameter space not covered in the presently-observed sample aad will include
some remnants with unique interesting features.
Grat- Exp.
R.A. Dec. (J2000) Target Name Det. ing Time
---------------------------------------------------------------------------------