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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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| Casati, R. |
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| Kočí, Jan | Prague |
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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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Fukazawa, Yasushi
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2017Suzaku Wide-band All-sky Monitor (WAM) observations of GRBs and SGRscitations
- 2017Soft Gamma-ray Observation of SN2014J with Suzaku
- 2013Spectral Variation of Hard X-Ray Emission from the Crab Nebula with the Suzaku Hard X-Ray Detectorcitations
- 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
- 2008Low/Hard State Spectra of GRO J1655-40 Observed with Suzaku
- 2008Low/Hard State Spectra of GRO J1655-40 Observed with Suzakucitations
- 2007Suzaku observation of the black hole transient 4U1630-472: discovery of absorption linescitations
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article
Low/Hard State Spectra of GRO J1655-40 Observed with Suzaku
Abstract
The Galactic black-hole binary GROJ1655-40, a source harboring superluminal jets, was observed with Suzaku on 2005 September 22-23. The source was detected over a broad and continuous energy range of 0.7-300keV, with an intensity of ∼50mCrab at 20keV. At a distance of 3.2kpc, the 0.7-300keV luminosity was ∼5.2 × 10<SUP>36</SUP> ergs<SUP>-1</SUP> (∼0.7% of the Eddington luminosity for a 6M<SUB>odot</SUB> black hole). The source was in a typical low/hard state, exhibiting a power-law shaped continuum with a photon index of ∼1.6. During the observation, the source intensity gradually decreased by 25% at energies above ∼3keV, and by 35% below 2keV. This, together with the soft X-ray spectra taken with the X-ray Imaging Spectrometer (XIS), suggests the presence of an independent soft component that can be represented by emission from a cool (∼0.2keV) disk. The hard X-ray spectra obtained with the Hard X-ray Detector reveal a high-energy spectral cutoff, with an e-folding energy of ∼200keV. The entire 0.7-300keV spectrum cannot be reproduced by a single thermal Comptonization model, even when considering reflection effects. Instead, the spectrum (except the soft excess) can be successfully explained by invoking two thermal-Comptonization components with different y-parameters. In contrast to the high/soft state spectra of this object, in which narrow iron absorption lines are detected with equivalent widths of 60-100eV, the present XIS spectra bear no such features beyond an upper-limit equivalent width of 23eV....