14.2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Goddard Space Flight CenterUS361 papers
- Marshall Space Flight CenterUS357 papers
- Centre National de la Recherche ScientifiqueFR280 papers
- Max Planck Institute for Extraterrestrial PhysicsDE240 papers
- University of Maryland, College ParkUS239 papers
- Universities Space Research AssociationUS214 papers
- Stanford UniversityUS212 papers
- National Institute for AstrophysicsIT196 papers
- University of Rome Tor VergataIT184 papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR179 papers
- University of PaduaIT178 papers
- Istituto Nazionale di Fisica Nucleare, Roma Tor VergataIT175 papers
22 papers · 1 filter
The Soft Gamma-Ray Spectral Variability of Cygnus X-1
M. L. McConnell, A. A. Zdziarski, K. Bennett +11
We have used observations of Cygnus X-1 from the Compton Gamma-Ray Observatory (CGRO) and BeppoSAX to study the variation in the MeV gamma-ray emission between the hard and soft sp…
Understanding the nature of the optically faint radio sources and their connection to the submillimeter population
Scott C. Chapman, Geraint F. Lewis, Douglas Scott +2
We present a sample of 43 submillimeter sources detected (at >3 sigma), drawn from our program to follow-up optically faint radio sources with SCUBA. These sources already have ass…
Chandra Observations of the Anomalous X-ray Pulsar 1E 2259+58.6
S. K. Patel, C. Kouveliotou, P. M. Woods +6
We present X-ray imaging, timing, and phase resolved spectroscopy of the anomalous X-ray pulsar 1E 2259+58.6 using the Chandra X-ray Observatory. The spectrum is well described by…
Serendipitous Detections of XTE J1906+09 with the Rossi X-ray Timing Explorer
Colleen A. Wilson, Mark H. Finger, Ersin Gogus +2
In 1996 during Rossi X-ray Timing Explorer (RXTE) observations of SGR 1900+14, the 89-s X-ray pulsar XTE J1906+09 was discovered. As a result of monitoring campaigns of SGR 1900+14…
The Burst and Transient Source Experiment Earth Occultation Technique
B. A. Harmon, G. J. Fishman, C. A. Wilson +7
An Earth orbiting detector sensitive to gamma ray photons will see step-like occultation features in its counting rate when a gamma ray point source crosses the Earth's limb. This…
Spectral Properties of Short Gamma-Ray Bursts
W. S. Paciesas, R. D. Preece, M. S. Briggs +1
The distribution of GRB durations is bimodal, but there is little additional evidence to support the division of GRBs into short and long classes. Based on simple hardness ratios,…
Large Torque Variations in Two Soft Gamma Repeaters
Peter M. Woods, Chryssa Kouveliotou, Ersin Gougus +5
We have monitored the pulse frequencies of the two soft gamma repeaters SGR 1806-20 and SGR 1900+14 through the beginning of year 2001 using primarily Rossi X-ray Timing Explorer P…
The mass of the neutron star in Vela X-1
O. Barziv, L. Kaper, M. H. van Kerkwijk +2
We measured the radial-velocity curve of HD77581, the B-supergiant companion of the X-ray pulsar Vela X-1, using 183 high-resolution optical spectra obtained in a nine-month campai…
Multi-wavelength observations of the Soft Gamma Repeater SGR 1900+14 during its April 2001 activation
C. Kouveliotou, A. Tennant, P. M. Woods +6
The soft-gamma repeater SGR 1900+14 became active on 18 April 2001 after about two years of quiescence; it had remained at a very low state of activity since the fall of 1998, when…
Sersic 159-03: discovery of the brightest soft X-ray excess emitting cluster of galaxies
M. Bonamente, R. Lieu, J. P. D. Mittaz
The soft X-ray excess emission in the southern cluster Sersic 159-03 represents hiterto the strongest effect of its kind. Emission in the ~0.2-0.4 keV passband is detected far in e…
Studying the Accretion Disks in Black Hole X-ray Binaries with Monte-Carlo Simulations
Yangsen Yao, Shuang Nan Zhang, Xiaoling Zhang
Understanding the properties of the hot corona is very important for studying the accretion disks in black hole X-ray binary systems. Using the Monte-Carlo technique to simulate th…
Relativistic Effects on X-ray Emissions from Accretion Disks around Black Holes
Xiaoling Zhang, Shuang Nan Zhang, Yangsen Yao
Special and general relativistic effects on the X-ray emissions, especially the continuum spectra, from the accretion disks around black holes are investigated using the ray-tracin…
Temporal and Spectral Characteristics of Short Bursts from the Soft Gamma Repeaters 1806-20 and 1900+14
Ersin Gogus, Chryssa Kouveliotou, Peter M. Woods +3
We study the temporal and coarse spectral properties of 268 bursts from SGR 1806-20 and 679 bursts from SGR 1900+14, all observed with the Rossi X-Ray Timing Explorer/Proportional…
FUSE Detection of Diffuse Galactic O VI Emission toward the Coma and Virgo Clusters
W. V. Dixon, S. Sallmen, M. Hurwitz +1
We report the detection of diffuse O VI 1032, 1038 A emission in a 29-ksec observation centered on the Coma Cluster (l = 57.6, b = +88.0) and an 11-ksec observation toward Virgo (l…
The second ROSAT PSPC survey of M31 and the complete ROSAT PSPC source list
R. Supper, G. Hasinger, W. H. G. Lewin +5
This paper reports the results of the analysis of the second ROSAT PSPC survey of M31 performed in summer 1992. We compare our results with those of the first survey. Within the ~1…
ROSAT and BeppoSAX evidence of soft X-ray excess emission in the Shapley supercluster: A3571, A3558, A3560 and A3562
M. Bonamente, R. Lieu, J. Nevalainen +1
Excess soft X-ray emission in clusters of galaxies has so far been detected for sources that lie along lines-of-sight to very low Galactic HI column density (such as Coma, A1795, A…
The metamorphosis of SN1998bw
Ferdinando Patat, Enrico Cappellaro, John Danziger +23
We present and discuss the photometric and spectroscopic evolution of the peculiar SN1998bw, associated with GRB980425, through an analysis of optical and near IR data collected at…
X-Ray Light Curves of Gamma-ray Bursts Detected with the All-Sky Monitor on RXTE
D. A. Smith, A. Levine, H. Bradt +6
We present X-ray light curves (1.5-12 keV) for fifteen gamma-ray bursts (GRBs) detected by the All-Sky Monitor on the Rossi X-ray Timing Explorer. We compare these soft X-ray light…
BATSE Observations of Fast X-ray Transients Detected by BeppoSAX-WFC
R. Marc Kippen, Peter M. Woods, John Heise +3
The BeppoSAX Wide Field Cameras have been successful in detecting gamma-ray bursts in the 2--26 keV energy range. While most detected bursts are also strong emitters at higher ener…
FUSE Limits on FUV Emission from Warm Gas in Clusters of Galaxies
W. V. Dixon, S. Sallmen, M. Hurwitz +1
We have obtained FUV spectra of two clusters of galaxies with FUSE, the Far Ultraviolet Spectroscopic Explorer. The Coma cluster was observed for a total of 28.6 ksec, the Virgo cl…
Evolution of Iron K Line Emission in the Black Hole Candidate GX 339-4
Y. X. Feng, S. N. Zhang, X. Sun +3
GX 339-4 was regularly monitored with RXTE during a period (in 1999) when its X-ray flux decreased significantly (from 4.2 erg cm to 7.6$\times 10^{-…
Evidence for a Sudden Magnetic Field Reconfiguration in SGR 1900+14
Peter M. Woods, Chryssa Kouveliotou, Ersin Gogus +5
We report the detection of large flux changes in the persistent X-ray flux of SGR 1900+14 during its burst active episode in 1998. Most notably, we find a factor ~700 increase in t…