Chandra X-Ray Observatory
	(CXC)

Accepted Cycle 14 Observing Proposals

BH & NS BINARIES

Proposal NumberSubject CategoryPI NameTitle
14400068BH AND NS BINARIESStraderCandidate Black Holes in a Galactic Globular Cluster
14400168BH AND NS BINARIESJonkerFollowing a black hole candidate X-ray transient to quiescence
14400215BH AND NS BINARIESWijnandsCrust cooling of accretion heated neutron stars
14400238BH AND NS BINARIESPooleyTransient LMXBs in Globular Clusters
14400273BH AND NS BINARIESChakrabartyPrecise Localization of Transient Low-Mass X-ray Binaries
14400307BH AND NS BINARIESDegenaarObservations of a cooling neutron star crust in Terzan 5
14400338BH AND NS BINARIESCORBELX-Ray Jets in Microquasars
14400368BH AND NS BINARIESGalloDeep Chandra/EVLA observations of the quiescent black hole X-ray binary XTE J1118+480
14400382BH AND NS BINARIESSoleriToO observations of the microquasar GRS 1915+105 in quiescence
14400398BH AND NS BINARIESGRENIERToO observation of a bright Galactic transient discovered by Fermi and Swift
14400480BH AND NS BINARIESMillerAccretion and Ejection in a Neutron Star Transient
14400504BH AND NS BINARIESWijnandsA snap-shot survey of Galatic neutron-star Be/X-ray transients in quiescence
14400542BH AND NS BINARIESLowellUsing Chandra to Determine Whether SAX J1750.8-2900 Harbors the Hottest, Most Luminous Known Neutron Star
14400567BH AND NS BINARIESPottschmidtFilling the gap in understanding the wind structure of HDE 226868 /Cyg X-1
14400596BH AND NS BINARIESGosnellA New Insight into Open Cluster Internal Dynamics and Neutron Star Formation
14400650BH AND NS BINARIESSakoX-raying the Stellar Wind and Atmosphere of Vela X-1
14400698BH AND NS BINARIESReynoldsSub-arcsecond Imaging of the Microquasar SS 433
14400720BH AND NS BINARIESBuxtonActive Quiescence in the Black Hole Binary System A0620-00
14400726BH AND NS BINARIESDurantMysterious extended emission near the gamma-ray binary 1FLG J1018.6-5856
14400769BH AND NS BINARIESKingThe Disk-Wind-Jet Coupling in Black Hole Candidate IGR J17091-3624
14400832BH AND NS BINARIESPosseltAn X-ray binary candidate with potential extended emission
14400833BH AND NS BINARIESDegenaarThe X-ray and UV spectra of the quiescent neutron star X-ray binary EXO 0748-676
14400870BH AND NS BINARIESZezasThe Small Magellanic Cloud - A Case Study of X-ray Populations at Low Metallicity
14400881BH AND NS BINARIESHarrisonBroad-band X-ray study of Ultraluminous X-ray sources with Chandra, XMM-Newton and NuSTAR
14400952BH AND NS BINARIESSmithConfirming the association of 1RXS~J180431.1-273932 with a Galactic Bulge giant
14400994BH AND NS BINARIESDiaz TrigoProbing the disc wind-jet connection in black hole transients with multiwavelength observations

Subject Category: BH AND NS BINARIES

Proposal Number: 14400068

Title: Candidate Black Holes in a Galactic Globular Cluster

PI Name: Jay Strader

We have detected two radio continuum sources with flat spectra in deep 6 GHz EVLA imaging of the core of the globular cluster M22. These objects are good candidates for being the first stellar-mass black holes discovered in a Galactic globular cluster. We propose deep Chandra/ACIS imaging of the core of M22 to detect X-ray emission from these sources and provide definitive evidence that they are black holes.

R.A. Dec. Target Name Det. Grating Exp.Time
18:36:24.20-23:54:12.00M22ACIS-SNONE85

Subject Category: BH AND NS BINARIES

Proposal Number: 14400168

Title: Following a black hole candidate X-ray transient to quiescence

PI Name: Peter Jonker

There is increasing evidence that the quiescent state of BH X-ray binaries is different from the canonical hard state. Our recent Chandra campaigns on BH transient decays suggest that the spectral hardening in the hard state decay stops. There are strong indications that the spectrum softens during the subsequent decay to the quiescent state, but this transition has not so far been resolved with enough signal-to-noise to fully quantify this effect. The spectral evolution can provide important constraints for jet-dominated and ADAF models. We request 6 simultaneous Chandra/EVLA TOO observations. The early part of the decay can be covered with approved Swift ToO and existing radio proposals.

R.A. Dec. Target Name Det. Grating Exp.Time
TOOACIS-SNONE187

Subject Category: BH AND NS BINARIES

Proposal Number: 14400215

Title: Crust cooling of accretion heated neutron stars

PI Name: Rudy Wijnands

We propose to continue our successful program to use the observed cooling of the crusts in accreting neutron star systems to probe the properties of ultra-dense matter. Those crusts are heated due to the accretion of matter on to neutron stars during the X-ray outburst and after the outbursts are over the crusts should cool down until they are in equilibrium with the core again. Following this cooling processes in several systems has already given us new insights in the structure of neutron stars (i.e., the crust but also the core and hence in ultra dense matter), but many uncertainties remain. Therefore it is needed to enlarge our sample of well studied sources to obtain better insights in the behavior of how neutron stars react to the accretion of matter.

R.A. Dec. Target Name Det. Grating Exp.Time
Quiescent sourceACIS-SNONE150

Subject Category: BH AND NS BINARIES

Proposal Number: 14400238

Title: Transient LMXBs in Globular Clusters

PI Name: David Pooley

Since the discovery of globular cluster LMXBs in the 1970s, it was assumed that there was only one luminous LMXB per cluster. Deep Chandra observations of several globular clusters have revealed that they contain numerous quiescent LMXB systems, any of which could go into outburst. Our observations will determine the precise locations of new outbursts from transient LMXBs in globular clusters, enabling the important study of their quiescent counterparts.

R.A. Dec. Target Name Det. Grating Exp.Time
GC Transient 1ACIS-SNONE15
GC Transient 2ACIS-SNONE15
GC Transient 3ACIS-SNONE15

Subject Category: BH AND NS BINARIES

Proposal Number: 14400273

Title: Precise Localization of Transient Low-Mass X-ray Binaries

PI Name: Deepto Chakrabarty

We propose to observe up to four neutron star or black hole X-ray transients in outburst to obtain accurate source positions, continuing a successful multi-year and multiwavelength program in place since Cycle 6. These positions will allow reobservation of these sources in the X-ray, optical, IR, and radio bands in order to study their quiescent emission. This program will increase the number of accurately positioned X=ay transients, providing a more uniform sample for future work. We will only trigger our program for sources in crowded or highly obscured fields where a position from another mission (e.g., Swift) is insufficiently precise.

R.A. Dec. Target Name Det. Grating Exp.Time
X-ray transient 1ACIS-SNONE1
X-ray transient 2ACIS-SNONE1
X-ray transient 3ACIS-SNONE1
X-ray transient 4ACIS-SNONE1

Subject Category: BH AND NS BINARIES

Proposal Number: 14400307

Title: Observations of a cooling neutron star crust in Terzan 5

PI Name: Nathalie Degenaar

We propose a 135-ks Chandra observation of the globular cluster Terzan 5, to continue our study of the thermal evolution of the transiently accreting neutron star IGR J17480-2446. Previous Chandra observations have revealed that the crust of the neutron star was severely heated during a 10-week long accretion outburst in 2010, and is currently cooling in quiescence. Monitoring this crustal cooling yields valuable information about the heat generation and thermal transport properties of the neutron star crust. Following the first instance where crust cooling has been observed after a short accretion outburst poses a breakthrough opportunity in neutron star research.

R.A. Dec. Target Name Det. Grating Exp.Time
17:48:05.20-24:46:47.30Terzan 5ACIS-SNONE135

Subject Category: BH AND NS BINARIES

Proposal Number: 14400338

Title: X-Ray Jets in Microquasars

PI Name: Stephane CORBEL

We propose Target of Opportunity (ToO) observations for detailed studies of X-ray jets from microquasars. We describe our discovery of radio/X-ray jets in three microquasars, why X-ray jets are probably much more common than previously thought, and transient X-ray jets offer an exciting new way to probe the physics of relativistic jets from black holes. The proposed ToO observations are optimized to discover and study (flux evolution, morphology, SED, proper motion, ...) of new X-ray jets from microquasars, triggered by their detection as radio lobes. This will have implications not only for the study of jets from Galactic X-ray binaries, but also for our understanding of relativistic jets from active galactic nuclei (AGN).

R.A. Dec. Target Name Det. Grating Exp.Time
X-ray JetsACIS-SNONE150

Subject Category: BH AND NS BINARIES

Proposal Number: 14400368

Title: Deep Chandra/EVLA observations of the quiescent black hole X-ray binary XTE J1118+480

PI Name: Elena Gallo

We request coordinated Chandra/EVLA observations - to be complemented by IR-optical & UV monitoring - of the quiescent black hole X-ray binary XTE J1118+480, the one source for which we can realistically hope to secure a simultaneous radio/X-ray detection at the lowest luminosity levels. The system SED will be fitted with a radiative jet-corona model which has been successfully applied to higher Eddington ratio black hole X-ray binaries, enabling us to: i) measure and compare the jet vs. accretion radiated luminosity; ii) test the acceleration physics of jets over different accretion regimes. Concurrently, these observations will probe the empirical radio/X-ray correlation for hard and quiescent state sources down to the lowest Eddington ratios.

R.A. Dec. Target Name Det. Grating Exp.Time
11:18:10.80+48:02:12.60XTE J1118+480ACIS-SNONE60

Subject Category: BH AND NS BINARIES

Proposal Number: 14400382

Title: ToO observations of the microquasar GRS 1915+105 in quiescence

PI Name: Paolo Soleri

We propose two Chandra observations (40 ks each) to detect the microquasar GRS 1915+105 in quiescence, should its current 20-year-long outburst end during the 14th Chandra observing cycle. This system has never been observed in quiescence: its properties suggest that its quiescent X-ray luminosity would be rather high (~10^34 erg/s), allowing a measurement of the spectrum and a test of models for quiescent emission in black-hole binaries. In addition, it will be possible to detect a fossil jet similar to that detected in the black hole candidate 4U 1755-33.

R.A. Dec. Target Name Det. Grating Exp.Time
19:15:11.60+10:56:44.00GRS 1915+105ACIS-INONE80

Subject Category: BH AND NS BINARIES

Proposal Number: 14400398

Title: ToO observation of a bright Galactic transient discovered by Fermi and Swift

PI Name: Isabelle GRENIER

We propose a TOO observation of one bright Galactic transient detected by the Fermi large area telescope, and followed by a Swift-XRT detection. Our goal is to determine the nature of an event similar to the intense, non-blazar, transient that EGRET has detected near the Galactic plane once in its lifetime. The lack of a radio-loud blazar counterpart and of a spacially coincident X-ray binary indicates either a new manifestation of a non-blazar active galaxy lying behind the Milky Way, capable of producing massive gamma-ray flares, or a new facet of Galactic compact objects. A significant XRT detection of an X-ray counterpart will trigger the proposed 30 ks Chandra observation to locate precisely this counterpart, to constrain the X-ray decay time, and to measure the source spectrum.

R.A. Dec. Target Name Det. Grating Exp.Time
Fermi TransientACIS-SNONE30

Subject Category: BH AND NS BINARIES

Proposal Number: 14400480

Title: Accretion and Ejection in a Neutron Star Transient

PI Name: Jon Miller

HETGS observations of black hole transients have revealed strong disk winds; these winds may eject more gas than is actually accreted. Disk winds have now been detected in two transient neutron star LMXBs using the HETGS, signalling the need for a dedicated program like those employed to study black hole transients. The detection of disk winds in transients stands in some contrast to HETGS observations of persistent ``Z'' and ``atoll'' neutron star binaries, wherein genuine disk winds are largely absent. To better understand accretion disks, disk winds, and their launching mechanisms, and in order to understand apparent differences between disks in fairly similar sources, we propose to observe a bright, transient, neutron star LMXB in outburst for 30 ksec using the HETGS.

R.A. Dec. Target Name Det. Grating Exp.Time
Neutron Star TransientACIS-SHETG30

Subject Category: BH AND NS BINARIES

Proposal Number: 14400504

Title: A snap-shot survey of Galatic neutron-star Be/X-ray transients in quiescence

PI Name: Rudy Wijnands

We propose to have a series of short (5 ksec each) observations on a selection of neutron-star Be/X-ray transients in their quiescent state. So far only a dozen of such systems have been studied in this state and a large variety of behavior has been observed. Our survey will investigate this range of behavior and determine if the majority of sources are still accreting at low level (in the so-called propeller regime) or that some are truly dormant in which case the accretion-heated neutron star might be visible. We will correlate our findings with any other source property in particular the neutron star spin, its magnetic field and binary orbital period.

R.A. Dec. Target Name Det. Grating Exp.Time
06:58:16.80-07:12:37.80MXB 0656-072ACIS-SNONE5
07:28:53.60-26:06:29.004U 0728-25ACIS-SNONE5
08:12:28.80-31:14:52.20RX J0812.4-3114ACIS-SNONE5
10:09:47.00-58:17:37.10GRO J1008-57ACIS-SNONE5
14:21:12.80-62:41:54.002S 1417-624ACIS-SNONE5
15:57:47.70-54:24:52.402S 1553-542ACIS-SNONE5
16:26:36.20-51:56:33.50Swift J1626.6-5156ACIS-SNONE5
18:45:36.80+00:51:48.30GS 1843+00ACIS-SNONE5
18:58:43.50+03:26:04.40XTE J1858+034ACIS-SNONE5
19:45:39.30+27:21:52.60XTE J1946+274ACIS-SNONE5
19:49:34.50+30:12:24.30KS 1947+300ACIS-SNONE5
21:39:30.70+56:59:10.00Cep X-4ACIS-SNONE5
22:39:20.90+61:16:26.80SAX J2239.3+6116ACIS-SNONE5
08:35:55.40-43:11:11.90GS 0834-430ACIS-SNONE5
17:49:12.80-26:38:38.80GRO J1750-27ACIS-SNONE5
21:03:35.70+45:45:05.50SAX J2103.5+4545ACIS-SNONE5

Subject Category: BH AND NS BINARIES

Proposal Number: 14400542

Title: Using Chandra to Determine Whether SAX J1750.8-2900 Harbors the Hottest, Most Luminous Known Neutron Star

PI Name: Alexander Lowell

The neutron star (NS) LMXB SAX J1750.8-2900 (J1750) was serendipitously observed in quiescence by XMM in 2010 and found to have an unabsorbed, bolometric luminosity of 1.05E34 erg/s. This source appears to be the most luminous quiescent LMXB known. Given the high luminosity of J1750, we find that it is inconsistent with with current NS cooling models. It is possible that the observed luminosity was due to an excess of thermal energy in the NS crust, which would indicate that the NS crust/core system was not in thermal equilibrium. If Chandra were to detect J1750 at a comparable luminosity, then this would imply that the core temperature of J1750 is indeed exceptionally high, confirming J1750 as an outlier amongst the population of NSs for which cooling studies have been conducted.

R.A. Dec. Target Name Det. Grating Exp.Time
17:50:24.40-29:02:15.40SAX J1750.8-2900ACIS-SNONE25

Subject Category: BH AND NS BINARIES

Proposal Number: 14400567

Title: Filling the gap in understanding the wind structure of HDE 226868 /Cyg X-1

PI Name: Katja Pottschmidt

We propose to observe the BH HMXB system HDE 226868 /Cyg X-1 as a ToO with Chandra-HETGS for 24 ks (corresponding to Delta phi=0.05 in orbital phase) between orbital phases phi=0.25 and phi =0.4. The spectroscopic analysis of the highly photoionized wind during this phase will improve our understanding of the wind, its implications for the accretion flow onto the black hole, and also of the conditions necessary for the formation of a narrow Fe K fluorescence line. In addition, during this phase dipping, which is very prominent at phi=0, is expected to cease. The morphology and spectral signatures of the very last observed dips will constrain the location and kinematics of the wind structures responsible for these absorption events.

R.A. Dec. Target Name Det. Grating Exp.Time
19:58:21.70+35:12:05.80Cyg X-1ACIS-SHETG24

Subject Category: BH AND NS BINARIES

Proposal Number: 14400596

Title: A New Insight into Open Cluster Internal Dynamics and Neutron Star Formation

PI Name: Natalie Gosnell

We propose a 22-ks ACIS-S3 observation of the qLMXB candidate X1 in the open cluster NGC 6819. Previous data from XMM and archival data from HST show at least two sources within the 2.14 arcsec X1 XMM position error circle. This observation will allow us to determine a sub-arcsecond position for X1, establishing the optical counterpart, a crucial step in classifying X1. For a precise astrometric match between the Chandra and HST frames we propose for one orbit of HST WFC3/UVIS/F336W data, which we will also use to search for signatures of an accretion disk. This proposal can confirm the first qLMXB in an open cluster, thereby providing important and much needed constraints for our theoretical understanding of NS formation and retention in open clusters.

R.A. Dec. Target Name Det. Grating Exp.Time
19:41:19.10+40:13:17.20NGC 6819ACIS-SNONE22

Subject Category: BH AND NS BINARIES

Proposal Number: 14400650

Title: X-raying the Stellar Wind and Atmosphere of Vela X-1

PI Name: Masao Sako

We propose to observe the archetypal low-luminosity high mass X-ray binary system Vela X-1 at phase = 0.75 to study the dynamics of the stellar wind and the structure of the X-ray irradiated stellar atomsphere. The high resolving power capabilities of the Chandra HETG will allow us to study the precise ionization structure and geometrical distribution of matter in the circumstellar medium through accurate measurements of emission line intensities and Doppler shifts and comparisons with existing data at different orbital phases. We will study both the highly-ionized emission spectrum as well as the fluorescent lines produced in dense colder structures in the binary system using detailed spectral models.

R.A. Dec. Target Name Det. Grating Exp.Time
09:02:06.90-40:33:16.90Vela X-1ACIS-SHETG50

Subject Category: BH AND NS BINARIES

Proposal Number: 14400698

Title: Sub-arcsecond Imaging of the Microquasar SS 433

PI Name: Mark Reynolds

We propose to observe the Galactic microquasar SS 433 for 20 ks with the ACIS-S array in 1/8 sub-array mode. This observation will be the highest resolution X-ray image obtained of this system to date. Based on analysis of archival data, we expect to detect the counterpart to the well known radio jet in X-rays, for the first time, at sub-arcsecond scales, and also search for evidence of an equatorial outflow.

R.A. Dec. Target Name Det. Grating Exp.Time
19:11:49.60+04:58:57.90SS 433ACIS-SNONE20

Subject Category: BH AND NS BINARIES

Proposal Number: 14400720

Title: Active Quiescence in the Black Hole Binary System A0620-00

PI Name: Michelle Buxton

Recent optical and infrared monitoring of the prototype black hole binary transient A0620-00 has shown considerable activity in X-ray quiescence. Here we propose three simultaneous Chandra, ELVA, and optical/IR observations to see how the activity indicators in these three wavelength regimes are correlated. The results will help us understand the inflow and outflow activity in quiescence, which is important for tests of relativity, for jet models, and for understanding the outburst cycle.

R.A. Dec. Target Name Det. Grating Exp.Time
06:22:44.50-00:20:44.70A0620-00ACIS-SNONE30

Subject Category: BH AND NS BINARIES

Proposal Number: 14400726

Title: Mysterious extended emission near the gamma-ray binary 1FLG J1018.6-5856

PI Name: Martin Durant

1FLG J1018.6-5856 is the new member of the exclusive gamma-ray binaries club. The nature of the compact object is not currently clear, with both an accreting black hole or a pulsar considered as possibilities. We observed J1018 with ACIS-I for 10 ks and discovered surrounding large-scale X-ray emission with intriguing morphology and a peculiar two-component spectrum, varying with the position. No such extended emission has been seen for the handful of known gamma-ray binaries. In a longer Chandra observation, we will be able to measure the spectrum with high S/N across the diffuse source extent, map its shape and morphology, and learn about the nature of the compact source.

R.A. Dec. Target Name Det. Grating Exp.Time
10:18:55.60-58:56:46.101FLG J1018.6-5856ACIS-INONE80

Subject Category: BH AND NS BINARIES

Proposal Number: 14400769

Title: The Disk-Wind-Jet Coupling in Black Hole Candidate IGR J17091-3624

PI Name: Ashley King

IGR J17091-3624 is a newly-discovered black hole candidate. Like GRS 1915+105, it appears to be persistent. It is also similar to GRS 1915+105 in the numerous variability classes observed in its X-ray flux curves. But, IGR J17091-3624 is even more extreme. It displays states not seen even in GRS 1915+105. Our recent HETGS observations revealed a disk wind with a velocity of 0.03c that may expel as much gas - or up to 20 times more - than accretes onto the black hole. For years, GRS 1915+105 has been the basis for disk-jet connections; IGR J17091-3624 presents an opportunity to study disk-wind-jet connections in an even more diverse set of accretion states. We request 4 observations of 40 ksec with the HETGS to study the evolution of inflows and outflows in IGR J17091-3624.

R.A. Dec. Target Name Det. Grating Exp.Time
17:09:08.00-36:24:24.00IGR J17091-3624ACIS-SHETG160

Subject Category: BH AND NS BINARIES

Proposal Number: 14400832

Title: An X-ray binary candidate with potential extended emission

PI Name: Bettina Posselt

We discovered an enigmatic X-ray source with Suzaku. The X-ray emission consists of a compact source and extended emission around it. The spectrum of the compact X-ray source is highly absorbed and can be described by three components: a power law, a blackbody, and a non-redshifted iron emission line. This spectrum points to an X-ray binary identification. A multiwavelength analysis showed apparent alignment of the extended X-ray emission with TeV and radio emission, and a potential association with the H-alpha emission surrounding the extended X-ray emission. There are very few X-ray binaries with extended emission around. We would like to employ the superb resolving power and sensitivity of Chandra to explore the compact X-ray source and the surrounding extended emission.

R.A. Dec. Target Name Det. Grating Exp.Time
18:11:51.00-19:00:54.00J1811ACIS-SNONE55

Subject Category: BH AND NS BINARIES

Proposal Number: 14400833

Title: The X-ray and UV spectra of the quiescent neutron star X-ray binary EXO 0748-676

PI Name: Nathalie Degenaar

We propose a 45-ks Chandra observation to continue our monitoring of the quiescent neutron star X-ray binary EXO 0748-676. A 25-year long accretion outburst severely heated the neutron star crust, which has been gradually cooling since the source returned to quiescence in 2008. Monitoring this thermal evolution provides the unique opportunity to study the heating processes and thermal transport properties of the neutron star crust. In addition we propose for 9 orbits of HST time to investigate the UV spectrum of EXO 0748-676 and to disentangle its quiescent accretion stream. This is of vital importance for a correct interpretation of the quiescent thermal X-ray emission and hence of the observed crust cooling.

R.A. Dec. Target Name Det. Grating Exp.Time
07:48:33.80-67:45:08.60EXO 0748-676ACIS-SNONE45

Subject Category: BH AND NS BINARIES

Proposal Number: 14400870

Title: The Small Magellanic Cloud - A Case Study of X-ray Populations at Low Metallicity

PI Name: Andreas Zezas

We propose a deep survey of 11 fields (100 ks each) in the SMC probing young (10-100 Myr) stellar populations of different ages down to a luminosity limit of 2E32 erg/s, well into the regime of quiescent X-ray binaries and X-ray emitting normal stars. These observations will provide the deepest luminosity functions (XLFs) of X-ray binaries ever recorded, enabling us to: (a) directly measure their formation efficiency as a function of age; (b) address the evolution of their XLF in the 10-100Myr range, (c) constrain the duty cycles of accreting pulsars; and (d) constrain parameters relevant to their formation and evolution. We will also observe for the first time low (0.2Zo) metallicity stars, and we will search for central compact objects in SNRs, and characterize their SN type.

R.A. Dec. Target Name Det. Grating Exp.Time
01:11:10.10-72:44:03.50SMC Deep Field 01ACIS-INONE100
01:13:33.20-72:32:41.80Deep Field 02ACIS-INONE100
01:13:56.90-73:20:34.00Deep Field 03ACIS-INONE100
01:13:39.90-73:08:37.20Deep Field 04ACIS-INONE100
00:56:08.60-72:35:02.50Deep Field 05ACIS-INONE100
00:52:46.60-72:42:11.80Deep Field 06ACIS-INONE100
00:51:52.00-73:00:24.60Deep Field 07ACIS-INONE100
00:49:43.20-72:49:16.30Deep Field 09ACIS-INONE100
00:41:00.00-73:19:60.00Deep Field 10ACIS-INONE100
00:47:09.60-73:07:33.00Deep Field 11ACIS-INONE100
00:56:35.90-72:20:06.30Deep Field 08ACIS-INONE100

Subject Category: BH AND NS BINARIES

Proposal Number: 14400881

Title: Broad-band X-ray study of Ultraluminous X-ray sources with Chandra, XMM-Newton and NuSTAR

PI Name: Fiona Harrison

ULXs are point-like, extragalactic off-nuclear sources with apparent isotropic super-Eddington luminosity. Possible explanations for their emission include a regime of super Eddington accretion onto a stellar mass BH, or the presence of intermediate mass BHs. X-ray spectroscopy up to 50 keV will be soon made possible by NASA's NuSTAR hard X-ray telescope, which has an approved large program for simultaneous observations joint with XMM to obtain high-quality broadband spectra of five ULXs. In this proposal we request four 10ks Chandra exposures in two fields as nearly coincident with the joint XMM/NuSTAR observations as possible. These Chandra observations are crucial for determining the contribution to the ULX spectra of nearby variable X-ray sources not resolvable by XMM or NuSTAR.

R.A. Dec. Target Name Det. Grating Exp.Time
13:29:38.60+58:25:06.00NGC 5204ACIS-INONE20
03:17:57.80-66:34:43.10NGC 1313ACIS-INONE20

Subject Category: BH AND NS BINARIES

Proposal Number: 14400952

Title: Confirming the association of 1RXS~J180431.1-273932 with a Galactic Bulge giant

PI Name: David Smith

The XMM-Newton position for the 494s X-ray pulsar 1RXS J180431.1-273932 lies 4.8'' from the M5 III bulge giant OGLEII DIA BUL-SC35 4278 (= 2MASS J18043013-2739340). If the association is correct, the system presents an evolutionary puzzle: an accreting x-ray pulsar, conventionally thought to be young and to require a high field, in a binary with a low-mass giant at least several Gyr old, with no nearby environment, such as a globular cluster, likely to provide opportunities for capture. The Newton position for the X-ray source is insufficient to rule out a chance association, but a 1 ksec Chandra observation would answer that question definitively.

R.A. Dec. Target Name Det. Grating Exp.Time
18:04:30.50-27:39:32.801RXS J180431.1-273932ACIS-INONE1

Subject Category: BH AND NS BINARIES

Proposal Number: 14400994

Title: Probing the disc wind-jet connection in black hole transients with multiwavelength observations

PI Name: Maria Diaz Trigo

We propose two observations of one high inclination black hole low mass X-ray binary (LMXB) at different stages of its outburst. We will investigate the presence of X-ray narrow absorption/emission features in the Chandra spectra, which are a signature of a disc wind, and their relation to the accreting regime. Such features, identified with ions like Fe XXV and Fe XXVI, have been observed in a number of LMXBs and give us information about the mass outflow rate and the launching mechanism of the wind. With simultaneous radio observations we will probe the jet power as a function of the wind properties and how the radio flux density correlates with the mass-outflow rate carried by the disc wind at different accretion regimes.

R.A. Dec. Target Name Det. Grating Exp.Time
Black Hole TransientACIS-SHETG50
Black Hole TransientACIS-SHETG50
10:13:36.30-45:04:31.00GRS 1009-45ACIS-SHETG50
16:34:01.60-47:23:34.804U 1630-47ACIS-SHETG50
16:59:10.00-15:16:05.00MAXI J1659-152ACIS-SHETG50
17:58:40.00-33:48:27.004U 1755-33ACIS-SHETG50
20:24:03.80+33:52:02.20GS 2023+338ACIS-SHETG50
11:18:10.80+48:02:12.60XTE J1118+48ACIS-SHETG50
16:50:01.00-49:57:43.60XTE J1650-500ACIS-SHETG50
17:08:14.60-25:05:29.00H 1705-250ACIS-SHETG50
18:19:21.60-25:24:25.80V 4641 SgrACIS-SHETG50
15:50:58.80-56:28:35.00XTE J1550-564ACIS-SHETG50
16:54:00.10-39:50:44.90GRO J1655-40ACIS-SHETG50
17:46:15.60-32:14:00.60H 1743-322ACIS-SHETG50
20:02:49.60+25:14:11.30GS 2000+25ACIS-SHETG50
10:13:36.30-45:04:31.00GRS 1009-45ACIS-SHETG50
16:34:01.60-47:23:34.804U 1630-47ACIS-SHETG50
16:59:10.00-15:16:05.00MAXI J1659-152ACIS-SHETG50
17:58:40.00-33:48:27.004U 1755-33ACIS-SHETG50
20:24:03.80+33:52:02.20GS 2023+338ACIS-SHETG50
11:18:10.80+48:02:12.60XTE J1118+48ACIS-SHETG50
16:50:01.00-49:57:43.60XTE J1650-500ACIS-SHETG50
17:08:14.60-25:05:29.00H 1705-250ACIS-SHETG50
18:19:21.60-25:24:25.80V 4641 SgrACIS-SHETG50
15:50:58.80-56:28:35.00XTE J1550-564ACIS-SHETG50
16:54:00.20-39:50:44.90GRO J1655-40ACIS-SHETG50
17:46:15.60-32:14:00.60H 1743-322ACIS-SHETG50
20:02:49.60+25:14:11.30GS 2000+25ACIS-SHETG50
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