Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-11-02
Astrophys.J.657:400-408,2007
Astronomy and Astrophysics
Astrophysics
12 pages, 6 figures, accepted for publication in ApJ
Scientific paper
10.1086/510326
We present the analysis of the high energy emission of the Galactic black hole binary GX 339-4 in a low/hard state at the beginning of its 2004 outburst. The data from 273 ks of INTEGRAL observations, spread over 4 weeks, are analyzed, along with the existing simultaneous RXTE HEXTE and PCA data. During this period, the flux increases by a factor of about 3, while the spectral shape is quite unchanged, at least up to 150 keV. The high energy data allows us to detect the presence of a high energy cut-off, generally related to thermal mechanisms, and to estimate the plasma parameters in the framework of the Comptonization models. We found an electron temperature of 60-70 keV, an optical depth around 2.5, with a rather low reflection factor (0.2-0.4). In the last observation, we detected a high energy excess above 200 keV with respect to thermal Comptonization while at lower energy, the spectrum is practically identical to the previous one, taken just 2 days before. This suggests that the low and high energy components have a different origin.
Corbel Sephane
Joinet A.
Jourdain Elisabeth
Kalemci Emrah
Malzac Julien
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