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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Takahashi, Hiromitsu
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2012The Hard X-ray Imager (HXI) for the ASTRO-H missioncitations
- 2011Improvements in Calibration of GSO Scintillators in the Suzaku Hard X-Ray Detectorcitations
- 2010Hard x-ray imager (HXI) for the ASTRO-H Missioncitations
- 2008In-Orbit Timing Calibration of the Hard X-Ray Detector on Board Suzakucitations
- 2008Suzaku Detection of Extended/Diffuse Hard X-Ray Emission from the Galactic Centercitations
- 2008Low/Hard State Spectra of GRO J1655-40 Observed with Suzaku
- 2008Low/Hard State Spectra of GRO J1655-40 Observed with Suzakucitations
- 2008Suzaku Broad-band Results On Cygnus X-1 In The Low/hard State
- 2007Improvement of ceramic YAG(Ce) scintillators to (YGd) <SUB>3</SUB>Al <SUB>5</SUB>O <SUB>12</SUB>(Ce) for gamma-ray detectorscitations
- 2007Suzaku observation of the black hole transient 4U1630-472: discovery of absorption linescitations
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document
Suzaku Broad-band Results On Cygnus X-1 In The Low/hard State
Abstract
We present Suzaku broad-band observational results on the Galactic black-hole binary Cygnus X-1. The source was observed for 17 ks with Suzaku in 2005 October, while it was in a low/hard state with a 0.7-300 keV luminosity of 4.6 x 10^37 erg/s. Spectra of the X-ray Imaging Spectrometer (XIS) and the Hard X-ray Detector (HXD) were clearly detected over 0.7-400 keV, and reproduced successfully incorporating a cool accretion disk and a hot Comptonizing corona. The coronal emission has a more concave spectral shape than that explained by a single Comptonizing emission model even considering the reflection component, and the corona is characterized by at least two optical depths of 0.4 and 1.5 which account for the softer and harder continua, respectively, with a common electron temperature of 100 keV. Below 1 keV, there exists significant contribution from the disk emission with the innermost temperature of 0.2 keV. The disk is thought to protrude half way into the corona, thus becoming not only the supplier of seed photons to the Compton cloud, but also the source of a soft spectral excess, a mild reflection hump, and a weakly broadened iron line. A comparison with the Suzaku data on GRO J1655-40, which was also observed in the Low/Hard state, reveals several interesting spectral differences, which can mostly be attributed to inclination effects assuming that the disk has a flat geometry while the corona is grossly spherical. An intensity-sorted spectroscopy indicates that the continuum becomes less Comptonized when the source flares up on times scales of 1-200 s, while the underlying disk remains unchanged....