X-ray and Optical Study of Low Core Density Globular Clusters NGC6144 and E3 (2009)
Lan, Shih Hao, Kong, Albert K. H., Verbunt, Frank, Lewin, Walter H. G., Bassa, Cees, Anderson, Scott F., ...
We report on the Chandra X-ray Observatory and Hubble Space Telescope observation of two low core density globular clusters, NGC6144 and E3. By comparing the number of X-ray sources inside the...
X-ray Sources and Their Optical Counterparts in the Galactic Globular Cluster M12 (NGC 6218) (2009)
Lu, Ting-Ni, Kong, Albert K. H., Bassa, Cees, Verbunt, Frank, Lewin, Walter H. G., Anderson, Scott F., ...
We study a Chandra X-ray Observatory ACIS-S observation of the Galactic globular clusterM12. With a 26 ks exposure time, we detect 6 X-ray sources inside the half-mass radius (2.16 arcminutes) of...
The Long-Term Variability of the X-Ray Sources in NGC 6946 and NGC 4485/4490 (2008)
Fridriksson, Joel K., Homan, Jeroen, Lewin, Walter H. G., Kong, Albert K. H., Pooley, David
We analyze data from five Chandra observations of the spiral galaxy NGC 6946 and from three Chandra observations of the irregular/spiral interacting galaxy pair NGC 4485/4490, with an emphasis on...
Type IIP supernova SN 2004et: a multiwavelength study in X-ray, optical and radio (2007)
Misra, Kuntal, Pooley, Dave, Chandra, Poonam, Bhattacharya, D., Ray, Alak K., Sagar, Ram, ...
Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
Kong, Albert K. H., Miller, Jon M., Mendez, Mariano, Cottam, Jean, Lewin, Walter H. G., Paerels, Frederik, ...
During a 200 ks observation with the XMM-Newton Reflection Grating Spectrometer, we detected 16 type-I X-ray bursts from GS 1826-24. We combined the burst spectra in an attempt to measure the...
Type IIP Supernova SN 2004et: A Multi-Wavelength Study in X-Ray, Optical and Radio (2007)
Misra, Kuntal, Pooley, Dave, Chandra, Poonam, Bhattacharya, D., Ray, Alak K., Sagar, Ram, ...
We present X-ray, broad band optical and low frequency radio observations of the bright type IIP supernova SN 2004et. The \cxo observed the supernova at three epochs, and the optical coverage spans a...
Homan, Jeroen, Van Der Klis, Michiel, Wijnands, Rudy, Belloni, Tomaso, Fender, Rob, Klein-Wolt, Marc, ...
(Abridged) We report on ten weeks of RXTE observations of the X-ray transient XTE J1701-462. Comparisons with other sources suggest it had all the characteristics of the neutron star Z sources (the...
XMM-Newton observations of the black hole X-ray transient XTE J1650-500 in quiescence (2005)
Homan, Jeroen, Wijnands, Rudy, Kong, Albert, Miller, Jon M., Rossi, Sabrina, Belloni, Tomaso, ...
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...
Late-time X-Ray, UV and Optical Monitoring of Supernova 1979C (2005)
Immler, Stefan, Fesen, Robert A., Van Dyk, Schuyler D., Weiler, Kurt W., Petre, Robert, Lewin, Walter H. G., ...
We present results from observations of SN 1979C with XMM-Newton in X-rays and in the UV, archival X-ray and HST data, and follow-up ground-based optical imaging. The XMM-Newton MOS spectrum shows...
X-ray sources in globular clusters of other galaxies (2005)
Lewin, Walter H. G., Verbunt, Frank
A large number of X-ray sources in globular clusters of galaxies other than the Milky Way has been found with Chandra. We discuss three issues relating to these sources. The X-ray luminosity function...
Late-time X-ray, UV, and optical monitoring of Supernova 1979C (2005)
Immler, Stefan, Fesen, Robert A., Van Dyk, Schuyler D., Weiler, Kurt W., Petre, Robert, Lewin, Walter H. G., ...
Cackett, Edward M., Wijnands, Rudy, Heinke, Craig O., Edmonds, Peter D., Lewin, Walter H. G., Pooley, David, ...
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...
Homan, Jeroen, Miller, Jon M., Wijnands, Rudy, Van Der Klis, Michiel, Belloni, Tomaso, Steeghs, Danny, ...
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...
Wijnands, Rudy, Homan, Jeroen, Heinke, Craig O., Miller, Jon M., Lewin, Walter H. G.
(Abridge) We observed the accreting millisecond X-ray pulsars XTE J0929-314 and XTE J1751-305 in their quiescent states using Chandra. From XTE J0929-314 we detected 22 photons (0.3-8 keV) in 24.4...
Globular Cluster X-ray Sources (2004)
Verbunt, Frank, Lewin, Walter H. G.
After a brief historical overview we discuss the luminous X-ray sources in globular clusters of our Galaxy. This is followed by an overview of the very luminous X-ray sources studied in globular...
X-ray Sources and their Optical Counterparts in the Globular Cluster M4 (2004)
Bassa, Cees, Pooley, David, Homer, Lee, Verbunt, Frank, Gaensler, Bryan M., Lewin, Walter H. G., ...
We report on the Chandra X-ray Observatory ACIS-S3 imaging observation of the Galactic globular cluster M4 (NGC 6121). We detect 12 X-ray sources inside the core and 19 more within the cluster...
Wijnands, Rudy, Homan, Jeroen, Miller, Jon M., Lewin, Walter 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...
Wijnands, Rudy, Heinke, Craig O., Pooley, David, Edmonds, Peter D., Lewin, Walter H. G., Grindlay, Jonathan 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...
A transient variable 6 Hz QPO from GX 339-4 (2003)
Nespoli, Elisa, Belloni, Tomaso, Homan, Jeroen, Miller, Jon M., Lewin, Walter H. G., Mendez, Mariano, ...
We report the results of an observation with the Rossi X-ray Timing Explorer of the black hole candidate GX 339-4 during its 2002/2003 outburst. This observation took place during a spectral...
Chandra Observations of the Faintest Low-Mass X-ray Binaries (2003)
Wilson, Colleen. A., Patel, Sandeep K., Kouveliotou, Chryssa, Jonker, Peter G., Van Der Klis, Michiel, Lewin, Walter H. G, ...
There exists a group of persistently faint galactic X-ray sources that, based on their location in the galaxy, high L_x/L_opt, association with X-ray bursts, and absence of low frequency X-ray...
High frequency quasi-periodic oscillations in the black hole X-ray transient XTE J1650-500 (2002)
Homan, Jeroen, Klein-Wolt, Marc, Rossi, Sabrina, Miller, Jon M., Wijnands, Rudy, Belloni, Tomaso, ...
We report the detection of high frequency variability in the black hole X-ray transient XTE J1650-500. A quasi-periodic oscillation (QPO) was found at 250 Hz during a transition from the hard to the...
Wijnands, Rudy, Nowak, Mike, Miller, Jon M., Homan, Jeroen, Wachter, Stefanie, Lewin, Walter H. G.
After almost 2.5 years of actively accreting, the neutron star X-ray transient and eclipsing binary MXB 1659-29 returned to quiescence in 2001 September. We report on a Chandra observation of this...
Immler, Stefan, Lewin, Walter H. G.
We present a review of X-ray observations of supernovae (SNe). By observing the (~0.1-100 keV) X-ray emission from young SNe, physical key parameters such as the circumstellar matter (CSM) density,...
Pooley, David, Lewin, Walter H. G., Verbunt, Frank, Homer, Lee, Margon, Bruce, Gaensler, Bryan M., ...
As part of our campaign to determine the nature of the various source populations of the low-luminosity globular cluster X-ray sources, we have obtained a Chandra X-ray Observatory ACIS-S3 image of...
Wijnands, Rudy, Miller, Jon M., Markwardt, Craig, Lewin, Walter H. G., Van Der Klis, Michiel
After more than a decade of actively accreting at about a tenth of the Eddington critical mass accretion rate, the neutron-star X-ray transient KS 1731-260 returned to quiescence in early 2001. We...
My Quarter Century with Jan van Paradijs (2001)
This is the final and somewhat expanded version. The quality of the color photos of this version is poor as there is an upload limit on astro-ph. Much higher quality versions are available at...
Homan, Jeroen, Van Der Klis, Michiel, Jonker, Peter G., Wijnands, Rudy, Kuulkers, Erik, Mendez, Mariano, ...
We have analyzed ~600 ks of Rossi X-ray Timing Explorer data of the neutron star low-mass X-ray binary and Z source GX 17+2. A study was performed of the properties of the noise components and...
Woods, Peter M., Kouveliotou, Chryssa, Van Paradijs, Jan, Koshut, Thomas M., Finger, Mark H., Briggs, Michael S., ...
The hard X-ray bursts observed during both major outbursts of the Bursting Pulsar (GRO J1744-28) show pulsations near the neutron star spin frequency with an enhanced amplitude relative to that of...
Psaltis, Dimitrios, Wijnands, Rudy, Homan, Jeroen, Jonker, Peter G., Van Der Klis, Michiel, Miller, M. Coleman, ...
We study the horizontal branch oscillations (HBO) and the two simultaneous kilohertz QPOs comparing their properties in five Z sources with the predictions of the magnetospheric beat-frequency and...
Rutledge, Robert E., Lewin, Walter H. G., Van Der Klis, Michiel, Van Paradijs, Jan, Dotani, Tadayasu, Vaughan, Brian, ...
By comparing positions on a spectral color-color diagram from 10 black hole candidates (BHCs) observed with Ginga (1354-64, 1826-24, 1630-47, LMC X-1, LMC X-3, GS 2000+25, GS 2023+33, GS 1124-68, Cyg...
Discovery of kHz quasi-periodic oscillations in the Z source Cygnus X-2 (1998)
Wijands, Rudy, Homan, Jeroen, Van Der Klis, Michiel, Kuulkers, Erik, Van Paradijs, Jan, Lewin, Walter H. G., ...
During observations with the Rossi X-Ray Timing Explorer from 1997 June 31 to July 3 we discovered two simultaneous kHz quasi-periodic oscillations (QPOs) near 500 and 860 Hz in the low-mass X-ray...
Discovery of KiloHertz Quasi-Periodic Oscillations in 4U 1735-44 (1998)
Wijnands, Rudy, Van Der Klis, Michiel, Mendez, Mariano, Van Paradijs, Jan, Lewin, Walter H. G., Lamb, Frederick K., ...
We discovered a single kHz quasi-periodic oscillation (QPO) near 1150 Hz in the Rossi X-ray Timing Explorer X-ray light curve of the low mass X-ray binary and atoll source 4U 1735-44. The rms...
Discovery of KiloHertz Quasi-Periodic Oscillations in the Z source Cygnus X-2 (1997)
Wijnands, Rudy, Homan, Jeroen, Van Der Klis, Michiel, Kuulkers, Erik, Van Paradijs, Jan, Lewin, Walter H. G., ...
During observations with RXTE we discovered two simultaneous kHz QPOs near 500 Hz and 860 Hz in the Z source Cyg X-2. In the X-ray color-color diagram and hardness-intensity diagram (HID) a clear Z...
KiloHertz Quasi-Periodic Oscillations in GX 17+2 (1997)
Wijnands, Rudy, Homan, Jeroen, Van Der Klis, Michiel, Mendez, Mariano, Kuulkers, Erik, Van Paradijs, Jan, ...
We observed the low-mass X-ray binary and Z source GX 17+2 with the Rossi X-ray Timing Explorer during 6-8 Feb 1997, 1-4 Apr 1997, and 26-27 Jul 1997. The X-ray color-color diagram shows a clear Z...
Discovery of microsecond time lags in kilohertz QPO (1997)
Vaughan, Brian A., Van Der Klis, Michiel, Mendez, Mariano, Van Paradijs, Jan, Wijnands, Rudy, Lewin, Walter H. G., ...
Using the Rossi X-ray Timing Explorer we have measured 27 microsecond time delays in 830 Hz quasi-periodic oscillations (QPO) between 4-6 keV and 11-17 keV in 4U 1608-52, with high-energy photons...
Standard Cosmology and the BATSE Number vs. Peak Flux Distribution (1995)
Rutledge, Robert, Hui, Lam, Lewin, Walter H. G.
The observed 2B BATSE distribution is consistent with the faintest GRBs in our sample originating from a redshift of Zmax ~ 0.8-3.0 (90\%), with the most likely values in the range of 1.0-2.2, and is...
X-ray, optical, & radio observations of M31 SNRS (a progress report) (1994)
Magnier, Eugene, Prins, Saskia, Van Paradijs, Jan, Lewin, Walter H. G., Hasinger, Günther, Pietsch, Wolfgang, ...
Magnier, Eugene, Prins, Saskia, Van Paradijs, Jan, Lewin, Walter H. G., Hasinger, Günther, Pietsch, Wolfgang, ...
On the Galactic Distribution of Gamma Ray Bursts (1993)
Rutledge, Robert E., Lewin, Walter H. G.
Quashnock and Lamb (1993) defined a sub-sample of Gamma-ray Bursts (GRBs) from the publicly available BATSE database which shows clumping toward the galactic plane, and concluded that all GRBs are...