Degenaar, N., Wijnands, R., Wolff, M. T., Ray, P. S., Wood, K. S., Homan, J., ...
The quasi-persistent neutron star X-ray transient and eclipsing binary EXO 0748-676 recently returned to quiescence following an accretion outburst that lasted more than 24 years. We report on 2...
Broad-band X-ray spectral evolution of GX 339-4 during a state transition (2008)
Del Santo, M., Belloni, T. M., Homan, J., Bazzano, A., Casella, P., Fender, R. P., ...
We report on X-ray and soft gamma-ray observations of the black-hole candidate GX 339-4 during its 2007 outburst, performed with the RXTE and INTEGRAL satellites. The hardness-intensity diagram of...
Cackett, E. M., Miller, J. M., Homan, J., Lewin, W. H. G., Mendez, M., ...
While iron emission lines are well studied in black hole systems, both in X-ray binaries and Active Galactic Nuclei, there has been less of a focus on these lines in neutron star low-mass X-ray...
X-ray and optical observations of M55 and NGC 6366: evidence for primordial binaries (2008)
Bassa, C. G., Pooley, D., Verbunt, F., Homer, L., Anderson, S. F., Lewin, W. H. G.
We present Chandra X-ray Observatory ACIS-S3 X-ray imaging observations and VLT/FORS2 and Hubble Space Telescope optical observations of two low-density Galactic globular clusters; NGC 6366 and M55....
X-ray time variability across the atoll source states of 4U 1636--53 (2008)
Altamirano, D., Méndez, M., Jonker, P. G., Klein-Wolt, M., Lewin, W. H. G.
We have studied the rapid X-ray time variability in 149 pointed observations with the \textit{Rossi X-ray Timing Explorer} (RXTE)'s Proportional Counter Array of the atoll source 4U~1636--53 in the...
The Burst Spectra of EXO 0748-676 during a Long 2003 XMM-Newton Observation (2007)
Cottam, J., Paerels, F., Méndez, M., Boirin, L., Lewin, W. H. G., Kuulkers, E., ...
Gravitationally redshifted absorption lines from highly ionized iron have been previously identified in the burst spectra of the neutron star in EXO 0748-676. To repeat this detection we obtained a...
Caballero-Garcia, M. D., Miller, J. M., Kuulkers, E., Trigo, M. Diaz, Homan, J., Lewin, W. H. G., ...
We present broadband (3-500 keV) INTEGRAL X-ray spectra and X-ray/optical light curves of the luminous black hole X-ray transient and relativistic jet source GRO J1655-40. Our analysis covers four...
Discovery of X-ray burst triplets in EXO 0748-676 (2007)
Boirin, L., Keek, L., Mendez, M., Cumming, A., Cottam, J., ...
[Abridged] Type-I X-ray bursts are thermonuclear flashes that take place on the surface of accreting neutron stars. The wait time between consecutive bursts is set by the time required to accumulate...
A Hard X-ray View on Scorpius X-1 with INTEGRAL: non-Thermal Emission ? (2006)
Di Salvo, T., Goldoni, P., Stella, L., Bazzano, A., Burderi, L., ...
We present here simultaneous INTEGRAL/RXTE observations of Sco X-1, and in particular a study of the hard X-ray emission of the source and its correlation with the position in the Z-track of the...
A Hard X-ray View on Scorpius X-1 with INTEGRAL: non-Thermal Emission ? (2006)
Di Salvo, T., Goldoni, P., Stella, L., Bazzano, A., Burderi, L., ...
We present here simultaneous INTEGRAL/RXTE observations of Sco X-1, and in particular a study of the hard X-ray emission of the source and its correlation with the position in the Z-track of the...
Faint X-ray Sources in the Globular Cluster Terzan 5 (2006)
Heinke, C. O., Wijnands, R., Cohn, H. N., Lugger, P. M., Grindlay, J. E., Pooley, D., ...
We report our analysis of a Chandra X-ray observation of the rich globular cluster Terzan 5, in which we detect 50 sources to a limiting 1.0-6 keV X-ray luminosity of 3*10^{31} ergs/s within the...
Chandra and Hubble Space Telescope Study of the Globular Cluster NGC 288 (2006)
Kong, A. K. H., Bassa, C., Pooley, D., Lewin, W. H. G., Homer, L., Verbunt, F., ...
We report on the Chandra X-ray Observatory observations of the globular cluster NGC 288. We detect four X-ray sources within the core radius and seven additional sources within the half-mass radius...
INTEGRAL/RossiXTE high-energy observation of a state transition of GX 339-4 (2006)
Belloni, T., Parolin, I., Del Santo, M., Homan, J., Casella, P., Fender, R. P., ...
On 2004 August 15, we observed a fast (shorter than 10 hours) state transition in the bright black-hole transient GX 339-4 simultaneously with RossiXTE and INTEGRAL. This transition was evident both...
A Hard X-ray View on Scorpius X-1 with INTEGRAL: non-Thermal Emission ? (2006)
Di Salvo, T., Goldoni, P., Stella, L., Bazzano, A., Burderi, L., ...
We present here simultaneous INTEGRAL/RXTE observations of Sco X-1, and in particular a study of the hard X-ray emission of the source and its correlation with the position in the Z-track of the...
The iron K-shell features of MXB 1728-34 from a simultaneous Chandra-RXTE observation (2006)
Ai, A. D', Salvo, T. Di, Iaria, R., Mendez, M., Burderi, L., Lavagetto, G., ...
The broad-band spectrum of Cyg X-2 with INTEGRAL (Research note) (2006)
Lavagetto, G., Salvo, T. Di, Falanga, M., Iaria, R., Robba, N.R., Burderi, L., ...
The broad-band spectrum of Cyg X-2 with INTEGRAL (Research note) (2006)
Lavagetto, G., Salvo, T. Di, Falanga, M., Iaria, R., Robba, N.R., Burderi, L., ...
The broad-band spectrum of Cyg X-2 with INTEGRAL (2006)
Lavagetto, G., Salvo, T. Di, Falanga, M., Iaria, R., Robba, N.R., Burderi, L., ...
We study the broad band (3-100 keV) spectrum of Cygnus X-2 with INTEGRAL. We find that the spectrum is well fitted by a Comptonized component with a seed-photons temperature of ~ 1 keV, an electron...
A Hard X-Ray View of Scorpius X-1 with INTEGRAL: Nonthermal Emission? (2006)
Salvo, T. Di, Goldoni, P., Stella, L., Klis, M. Van Der, Bazzano, A., Burderi, L., ...
We present here simultaneous INTEGRAL/RXTE observations of Sco X-1 and in particular a study of the hard X-ray emission of the source and its correlation with the position in the Z track of the X-ray...
The iron K-shell features of MXB 1728-34 from a simultaneous Chandra-RXTE observation (2006)
D'AÃ, A., Salvo, T. Di, Iaria, R., Méndez, R.M., Burderi, L., Lavagetto, G., ...
We report on a simultaneous Chandra and RossiXTE observation of the low-mass X-ray binary atoll bursting source MXB 1728-34 performed on 2002 March 3-5. We fit the 1.2-35 keV continuum spectrum with...
INTEGRAL/RXTE high-energy observation of a state transition of GX 339-4 (2006)
Belloni, T., Parolin, I., Santo, M. Del, Homan, J., Casella, P., Fender, R.P., ...
On 2004 August 15, we observed a fast (shorter than 10 h) state transition in the bright black hole transient GX 339-4 simultaneously with Rossi X-Ray Timing Explorer (RXTE) and INTEGRAL. This...
Miller, J.M., Raymond, J., Homan, J., Fabian, A.C., Steeghs, D., Wijnands, R.A.D., ...
We observed the bright phase of the 2003 outburst of the Galactic black hole candidate H1743-322 in X-rays simultaneously with Chandra and RXTE on four occasions. The Chandra HETGS spectra reveal...
XMM-Newton observations of the black hole X-ray transient XTE J1650-500 in quiescence (2006)
Homan, J., Wijnands, R.A.D., Kong, A., Miller, J.M., Rossi, S., Belloni, T., ...
We report the result of an XMM-Newton observation of the black hole X-ray transient XTE J1650-500 in quiescence. The source was not detected, and we set upper limits on the 0.5-10 keV luminosity of...
Continuing RXTE observations of XTE J1701-462: a new "Z" in town? (2006)
Homan, J., Belloni, T., Klis, M. Van Der, Casella, P., Mendez, M., Lewin, W.H.G., ...
Since January 19 the new X-ray transient XTE J1701-462 (ATels #696, #703, #708, #710) has been observed more than 45 times with the Rossi X-ray Timing Explorer (RXTE). Preliminary analysis of the...
Spectral evolution and kHz QPOs in the transient Z source XTE J1701-462 (2006)
Homan, J., Belloni, T., Klis, M.V.D., Casella, P., Mendez, M., Lewin, W.H.G., ...
Since our last report on the transient Z source XTE J1701-462 (ATel #725), RXTE has continued observing the source on an almost daily basis. Spectral evolution similar to that reported by Homan et...
Faint X-Ray Sources in the Globular Cluster Terzan 5 (2006)
Heinke, C.O., Wijnands, R.A.D., Cohn, H.N., Lugger, P.M., Grindlay, J.E., Pooley, D., ...
We report our analysis of a Chandra X-ray observation of the rich globular cluster Terzan 5, in which we detect 50 sources to a limiting 1.0-6 keV X-ray luminosity of 3¿031 ergs s-1 within the...
A Hard X-Ray View of Scorpius X-1 with INTEGRAL: Nonthermal Emission? (2006)
Salvo, T. Di, Goldoni, P., Stella, L., Klis, M. Van Der, Bazzano, A., Burderi, L., ...
We present here simultaneous INTEGRAL/RXTE observations of Sco X-1 and in particular a study of the hard X-ray emission of the source and its correlation with the position in the Z track of the X-ray...
The iron K-shell features of MXB 1728-34 from a simultaneous Chandra-RXTE observation (2006)
D'A¿A., ., Salvo, T. Di, Iaria, R., M¿ez, M., Burderi, L., Lavagetto, G., ...
We report on a simultaneous Chandra and RossiXTE observation of the low-mass X-ray binary atoll bursting source MXB 1728-34 performed on 2002 March 3-5. We fit the 1.2-35 keV continuum spectrum with...
Cooling of the quasi-persistent neutron star X-ray transients KS 1731-260 and MXB 1659-29 (2006)
Cackett, E.M., Wijnands, R.A.D., Linares, M., Miller, J.M., Homan, J., Lewin, W.H.G.
We present Chandra and XMM-Newton X-ray observations that monitor the neutron star cooling of the quasi-persistent neutron star X-ray transients KS 1731-260 and MXB 1659-29 for approximately 4 yr...
Cooling of Accretion Heated Neutron Star Transients (2006)
Cackett, E.M., Wijnands, R.A.D., Linares, M., Miller, J.M., Homan, J., Lewin, W.H.G.
Some neutron star X-ray transients (the quasi-persistent transients) spend an unusually long time in outburst, with outbursts lasting years to decades rather than the usual weeks to months. During...
A Chandra X-ray observation of the globular cluster Terzan 1 (2006)
Cackett, E.M., Wijnands, R.A.D., Heinke, C.O., Pooley, D., Lewin, W.H.G., Grindlay, J.E., ...
We present a ~19-ks Chandra Advanced CCD Imaging Spectrometer (ACIS)-S observation of the globular cluster Terzan 1. 14 sources are detected within 1.4arcmin of the cluster centre with two of these...
INTEGRAL/RXTE high-energy observation of a state transition of GX 339-4 (2006)
Belloni, T., Parolin, I., Santo, M. Del, Homan, J., Casella, P., Fender, R.P., ...
On 2004 August 15, we observed a fast (shorter than 10 h) state transition in the bright black hole transient GX 339-4 simultaneously with Rossi X-Ray Timing Explorer (RXTE) and INTEGRAL. This...
Compact stellar X-ray sources (2006)
Lewin, W.H.G., Klis, M. Van Der
X-ray astronomy is the prime available window on astrophysical compact objects: black holes, neutron stars and white dwarfs. In the last ten years new observational opportunities have led to an...
A Chandra X-ray observation of the globular cluster Terzan 1 (2005)
Cackett, E. M., Wijnands, R., Heinke, C. O., Pooley, D., Lewin, W. H. G., Grindlay, J. E., ...
We present a 19 ks Chandra ACIS-S observation of the globular cluster Terzan 1. Fourteen sources are detected within 1.4 arcmin of the cluster center with 2 of these sources predicted to be not...
The Iron K-shell features of MXB 1728-34 from a Simultaneous Chandra-RXTE Observation (2005)
Ai, A. D', Di Salvo, T., Iaria, R., Mendez, M., Burderi, L., Lavagetto, G., ...
We report on a simultaneous Chandra and RossiXTE observation of the low-mass X-ray binary atoll bursting source MXB 1728-34 performed on 2002 March 3-5. We fit the 1.2-35 keV continuum spectrum with...
The broad-band spectrum of Cyg X-2 with INTEGRAL (2005)
Lavagetto, G., Di Salvo, T., Falanga, M., Iaria, R., Robba, N. R., Burderi, L., ...
We study the broad band (3-100 keV) spectrum of Cygnus X-2 with INTEGRAL. We find that the spectrum is well fitted by a Comptonized component with a seed-photons temperature of ~1 keV, an electron...
Belloni, T., Homan, J., Casella, P., Nespoli, E., Lewin, W. H. G., ...
We present the results of the timing and color analysis of more than two hundred RXTE/PCA observations of the bright black-hole transient GX 339-4 obtained during its 2002/2003 outburst. The...
Belloni, T., Homan, J., Casella, P., Klis, M. Van Der, Nespoli, E., Lewin, W.H.G., ...
We present the results of the timing and color analysis of more than two hundred RXTE/PCA observations of the bright black-hole transient GX 339-4 obtained during its 2002/2003 outburst. The...
Homan, J., Miller, J.M., Wijnands, R., Klis, M. Van Der, Belloni, T., Steeghs, D., ...
We present a variability study of the black hole candidate and X-ray transient H1743-322 during its 2003-2004 outburst. We analyzed five Rossi X-Ray Timing Explorer observations that were performed...
Bassa, C., Pooley, D., Homer, L., Verbunt, F., Gaensler, B.M., Lewin, W.H.G., ...
Luigi Bedin and Ivan King have informed us that the X-ray source CX 2 is in fact the candidate quasi-stellar object (QSO) identified by L.-R. Bedin et al. (ApJ, 609, 755 [2004]). We concluded that...
Addendum: X-ray sources and their optical counterparts in the globular cluster M4 (2005)
Bassa, C.G., Pooley, D., Homer, L., Verbunt, F.W.M., Gaensler, B.M., Lewin, W.H.G., ...
INTEGRAL SPI limits on electron-positron annihilation radiation from the galactic plane (2005)
Teegarden, B. J., Watanabe, K., Jean, P., Knödlseder, J., Lonjou, V., Roques, J. P., ...
Wijnands, R.A.D., Heinke, C.O., Pooley, D., Edmonds, P.D., Lewin, W.H.G., Grindlay, J.E., ...
We present a Chandra observation of the globular cluster Terzan 5 during times when the neutron star X-ray transient EXO 1745-248 located in this cluster was in its quiescent state. We detected the...
Wijnands, R.A.D., Homan, J., Heinke, C.O., Miller, J.M., Lewin, W.H.G.
We observed the accretion-driven millisecond X-ray pulsars XTE J0929-314 and XTE J1751-305 in their quiescent states using Chandra. From XTE J0929-314 we detected 22 source photons (in the energy...
Revealing the Focused Companion Wind in Cygnus X-1 with Chandra (2005)
Miller, J.M., Wojdowski, P., Schulz, N.S., Marshall, H.L., Fabian, A.C., Remillard, R.A., ...
We have analyzed a Chandra HETGS spectrum of the Galactic black hole Cygnus X-1, obtained at a source flux that is approximately twice that commonly observed in its persistent low-intensity,...
Cackett, E.M., Wijnands, R.A.D., Heinke, C.O., Edmonds, P.D., Lewin, W.H.G., Pooley, D., ...
The globular cluster NGC 6440 is known to harbor a bright neutron star X-ray transient. We observed the globular cluster with Chandra on two occasions when the bright transient was in its quiescent...
X-ray Binaries in Terzan 5 (2005)
Heinke, C.O., Wijnands, R.A.D., Grindlay, J.E., Cohn, H.N., Lugger, P.M., Edmonds, P.D., ...
Terzan 5 is a rich globular cluster located near the Galactic Center, containing a transient LMXB and a large number of millisecond pulsars. Two Chandra observations have identified the transient...
GRO J1655-40 enters a highly-variable, high-luminosity state (2005)
Homan, J., Miller, J.M., Wijnands, R.A.D., Lewin, W.H.G.
GRO J1655-40 enters a highly-variable, high-luminosity state Jeroen Homan (MIT), Jon M. Miller (CfA), Rudy Wijnands (U. of Amsterdam), and Walter H.G. Lewin (MIT) Recent RXTE observations of the...
GRO J1655-40 returning to the hard state (2005)
Homan, J., Miller, J.M., Wijnands, R.A.D., Lewin, W.H.G.
We have been monitoring the ongoing outburst of the black-hole X- ray transient GRO J1655-40 with more than 400 pointed RXTE observations since its start in mid February 2005 (ATel #414). During the...
INTEGRAL/SPI Limits on Electron-Positron Annihilation Radiation from the Galactic Plane (2004)
Teegarden, B. J., Watanabe, K., Jean, P., Knodlseder, J., Lonjou, V., Roques, J. P., ...
The center of our Galaxy is a known strong source of electron-positron 511-keV annihilation radiation. Thus far, however, there have been no reliable detections of annihilation radiation outside of...
Miller, J. M., Raymond, J., Homan, J., Fabian, A. C., Steeghs, D., Wijnands, R., ...
We observed the bright phase of the 2003 outburst of the Galactic black hole candidate H 1743-322 in X-rays simultaneously with Chandra and RXTE on four occasions. The Chandra/HETGS spectra reveal...
Relativistic Iron Lines in Galactic Black Holes: Recent Results and Lines in the ASCA Archive (2004)
Miller, J. M., Fabian, A. C., Nowak, M. A., Lewin, W. H. G.
Recent observations with Chandra and XMM-Newton, aided by broad-band spectral coverage from RXTE, have revealed skewed relativistic iron emission lines in stellar-mass Galactic black hole systems....
Wijnands, R.A.D., Homan, J., Miller, J.M., Lewin, W.H.G.
We have observed the quasi-persistent neutron star X-ray transient and eclipsing binary MXB 1659-29 in quiescence on three occasions with Chandra. The purpose of our observations was to monitor the...
Variability in the X-ray warm absorber in GX 339-4 (2004)
Miller, J.M., Raymond, J., Fabian, A.C., Wijnands, R., Klis, M. Van Der, Lewin, W.H.G.
X-Ray Sources and Their Optical Counterparts in the Globular Cluster M4 (2004)
Bassa, C.G., Pooley, D., Homer, L., Verbunt, F.W.M., Gaensler, B.W., Lewin, W.H.G., ...
X-Ray Sources and Their Optical Counterparts in the Globular Cluster M4 (2004)
Bassa, C.G., Pooley, D., Homer, L., Verbunt, F., Gaensler, B.M., Lewin, W.H.G., ...
Variability in the X-ray Warm Absorber in GX 339-4 (2004)
Miller, J.M., Raymond, J., Fabian, A.C., Wijnands, R.A.D., Klis, M. Van Der, Lewin, W.H.G.
We have previously reported evidence for a Seyfert-like warm absorber in the stellar-mass Galactic black hole GX 339-4, based on a Chandra/HETGS spectrum obtained during a 75 ksec observation during...
Miller, J.M., Raymond, J., Fabian, A.C., Homan, J., Nowak, M.A., Wijnands, R.A.D., ...
We observed the Galactic black hole GX 339-4 with the Chandra High Energy Transmission Grating Spectrometer (HETGS) for 75 ks during the decline of its 2002-2003 outburst. The sensitivity of this...
Miller, J.M., Fabian, A.C., Reynolds, C.S., Nowak, M.A., Homan, J., Freyberg, M.J., ...
We have analyzed spectra of the Galactic black hole GX 339-4 obtained through simultaneous 76 ks XMM-Newton/EPIC-pn and 10 ks Rossi X-Ray Timing Explorer observations during a bright phase of its...