509 citations · 7k across the 128 of their papers we have counts for
52 papers · 1 filter
Broad-Band Spectrum of The Black Hole Candidate IGR J17497-2821 Studied with Suzaku
A. Paizis, K. Ebisawa, H. Takahashi +9
The broad-band 1-300 keV Suzaku spectrum of IGR J17497-2821, the X-ray transient discovered by INTEGRAL in September 2006, is presented. Suzaku observed IGR J17497-2821 on Septembe…
X-ray studies of HESS J1837--069 with Suzaku and ASCA: a VHE gamma-ray source originated from the pulsar wind nebula
Takayasu Anada, Ken Ebisawa, Tadayasu Dotani +1
We present the ASCA and Suzaku studies of the TeV source HESS J1837--069, which has not been identified in other wave-lengths. We confirm the presence of two X-ray sources in the S…
Iron Emission Lines on the Galactic Ridge Observed with Suzaku
Shigeo Yamauchi, Ken Ebisawa, Yasuo Tanaka +5
In order to elucidate origin of the Galactic Ridge X-ray Emission, we analyzed Suzaku data taken at various regions along the Galactic plane and studied their Fe-K emission line fe…
A Simple Comptonization Model
James F. Steiner, Ramesh Narayan, Jeffrey E. McClintock +1
We present an empirical model of Comptonization for fitting the spectra of X-ray binaries. This model, "simpl", has been developed as a package implemented in XSPEC. With only two…
Suzaku Results on Cygnus X-1 in the Low/Hard State
Kazuo Makishima, Hiromitsu Takahashi, Shin'ya Yamada +9
The black-hole binary Cygnus X-1 was observed for 17 ks with the Suzaku X-ray observatory in 2005 October, while it was in a low/hard state with a 0.7-300 keV luminosity of 4.6 x 1…
In Orbit Timing Calibration of the Hard X-Ray Detector on Board Suzaku
Yukikatsu Terada, Teruaki Enoto, Ryouhei Miyawaki +28
The hard X-ray detector (HXD) on board the X-ray satellite Suzaku is designed to have a good timing capability with a 61 s time resolution. In addition to detailed descriptions…
Suzaku Detection of Extended/Diffuse Hard X-Ray Emission from the Galactic Center
Takayuki Yuasa, Ken-ichi Tamura, Kazuhiro Nakazawa +12
Five on-plane regions within +/- 0.8deg of the Galactic center were observed with the Hard X-ray Detector (HXD) and the X-ray Imaging Spectrometer (XIS) onboard Suzaku. From all re…
Low/Hard State Spectra of GRO J1655-40 Observed with Suzaku
Hiromitsu Takahashi, Yasushi Fukazawa, Tsunefumi Mizuno +23
The Galactic black-hole binary GRO J165540 was observed with Suzaku on 2005 September 22--23, for a net exposure of 35 ks with the X-ray Imaging Spectrometer (XIS) and 20 ks wit…
Detection of a Rare Supersoft Outburst Event during a Suzaku Observation of 1E0102.2-7219
D. Takei, M. Tsujimoto, S. Kitamoto +4
We report the detection of a transient X-ray source toward the Small Magellanic Cloud (SMC) using the X-ray Imaging Spectrometer (XIS) onboard the Suzaku telescope. The source was…
Hunting the nature of IGR J17497-2821 with X-ray and NIR observations
A. Paizis, M. A. Nowak, S. Chaty +7
We report on a Chandra grating observation of the recently discovered hard X-ray transient IGR J17497-2821. The observation took place about two weeks after the source discovery at…
A Stellar-mass Black Hole in the Ultra-luminous X-ray Source M82 X-1?
Takashi Okajima, Ken Ebisawa, Toshihiro Kawaguchi
We have analyzed the archival XMM-Newton data of the bright Ultra-Luminous X-ray Source (ULX) M82 X-1 with an 105 ksec exposure when the source was in the steady state. Thanks to t…
Suzaku Observation of Two Ultraluminous X-Ray Sources in NGC 1313
T. Mizuno, R. Miyawaki, K. Ebisawa +19
Two ultraluminous X-ray sources (ULXs) in the nearby Sb galaxy NGC 1313, named X-1 and X-2, were observed with Suzaku on 2005 September 15. During the observation for a net exposur…
Monte-Carlo Simulator and Ancillary Response Generator of Suzaku XRT/XIS System for Spatially Extended Source Analysis
Y. Ishisaki, Y. Maeda, R. Fujimoto +31
We have developed a framework for the Monte-Carlo simulation of the X-Ray Telescopes (XRT) and the X-ray Imaging Spectrometers (XIS) onboard Suzaku, mainly for the scientific analy…
The INTEGRAL Galactic Bulge monitoring program
E. Kuulkers, S. Shaw, S. Brandt +11
The Galactic Bulge region is a rich host of variable high-energy point sources. These sources include bright and relatively faint X-ray transients, X-ray bursters, persistent neutr…
Crab: the standard X-ray candle with all (modern) X-ray satellites
M. G. F. Kirsch et al.
Various X-ray satellites have used the Crab as a standard candle to perform their calibrations in the past. The calibration of XMM-Newton, however, is independent of the Crab nebul…
Resolving the Hard X-ray Emission of GX 5-1 with INTEGRAL
A. Paizis, K. Ebisawa, T. Tikkanen +5
We present the study of one year of INTEGRAL data on the neutron star low mass X-ray binary GX 5-1. Thanks to the excellent angular resolution and sensitivity of INTEGRAL, we are a…
Chandra Deep X-ray Observation of a Typical Galactic Plane Region and Near-Infrared Identification
K. Ebisawa, M. Tsujimoto, A. Paizis +13
Using the Chandra Advanced CCD Imaging Spectrometer Imaging array (ACIS-I), we have carried out a deep hard X-ray observation of the Galactic plane region at (l,b) ~ (28.5, 0.0), w…
On the temperature profile of radiatively efficient geometrically thin disks in black hole binaries with the ASCA GIS
Aya Kubota, Ken Ebisawa, Kazuo Makishima +1
X-ray spectra of black hole binaries(BHBs) in the high/soft state were studied comprehensively by using ASCA GIS data, and partially RXTE PCA data. A mathematical disk model was ap…
Discovery of the INTEGRAL X/Gamma-ray transient IGR J00291+5934: a Comptonised accreting ms pulsar ?
S. E. Shaw, N. Mowlavi, J. Rodriguez +8
We report the discovery of a high-energy transient with the IBIS/ISGRI detector on board the INTEGRAL observatory. The source, namely IGR J00291+5934, was first detected on 2nd Dec…
The INTEGRAL View of the Galactic Nucleus
A. Goldwurm, G. Belanger, P. Goldoni +15
We present the preliminary results of the observational campaign performed in 2003 to study the Galactic Nucleus with INTEGRAL. The mosaicked images obtained with the IBIS/ISGRI co…
A Chandra Deep X-ray Exposure on the Galactic Plane and Near Infrared Identification
K. Ebisawa, A. Paizis, T. J. -L. Couvoisier +13
Using the Chandra ACIS-I instruments, we have carried out a deep X-ray observation on the Galactic plane region at (l,b) ~ (28.5, 0.0), where no discrete X-ray sources have been kn…
Systematic Search for Short-transients and Pulsation Events from INTEGRAL Survey Data
Ken Ebisawa, Peter Kretschmar, Nami Mowlavi +9
The imaging instruments on board INTEGRAL have wide fields of view and high time resolution. Therefore, they are ideal instruments to search for pulsating sources and/or transient…
The INTEGRAL LMXRB Monitoring Programme
A. Paizis, T. J. -L. Courvoisier, O. Vilhu +21
Our collaboration is responsible for the study of a sample of 72 low mass X-ray binaries (LMXRB) using the INTEGRAL Core Programme data. In this paper we describe the monitoring pr…
Scientific Performance of the ISDC Quick Look Analysis
S. E. Shaw, N. Mowlavi, K. Ebisawa +22
The INTEGRAL Science Data Centre (ISDC) routinely monitors the Near Real Time data (NRT) from the INTEGRAL satellite. A first scientific analysis is made in order to check for the…