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2005年爆发的INTEGRAL光谱揭示的J1655-40 J1655-40的高能发射

The high energy emission of GRO J1655-40 as revealed with INTEGRAL spectroscopy of the 2005 outburst

M. D. Caballero-Garcia, J. M. Miller, E. Kuulkers, M. Diaz Trigo, J. Homan, W. H. G. Lewin, P. Kretschmar, A. Domingo, J. M. Mas-Hesse, R. Wijnands, A. C. Fabia… 展开作者

M. D. Caballero-Garcia, J. M. Miller, E. Kuulkers, M. Diaz Trigo, J. Homan, W. H. G. Lewin, P. Kretschmar, A. Domingo, J. M. Mas-Hesse, R. Wijnands, A. C. Fabian, R. P. Fender, M. van der Klis

摘要:

本文给出了发光黑洞X射线瞬态和相对论性喷流源GRO J1655-40的宽带(3-500 keV)积分X射线谱和X射线/光学光变曲线。我们的分析涵盖了2005年2月开始的爆发的四个机会观测目标。我们发现GRO J1655-40的高能辐射可以很好地用不间断的幂律模型来模拟(第一次和第二次观测的光子指数分别为1.72 ± 0.03,2.21 ± 0.04)。这些分别对应于硬和热主导状态。与许多其他黑洞光谱不同,硬态不需要以断裂或截止形式存在的高能量复杂性,这与以前对这种状态的预期相反。我们第一次表明,康普顿化的非热电子是占主导地位的过程中的高能量发射的硬态。我们讨论了我们的结果在恒星质量黑洞的宽带发射和吸积流的模型。

英文摘要:

We present broadband (3-500 keV) INTEGRAL X-ray spectra and X-ray/optical light curves of the luminous black hole X-ray transient and relativistic jet source GRO J1655-40. Our analysis covers four Target of Opportunity observations of the outburst that started in February 2005. We find that the high energy emission of GRO J1655-40 can be modelled well with an unbroken power-law (with photon indices of 1.72+-0.03,2.21+-0.04 for the first and the second observations, respectively). These correspond to hard and thermal dominant states, respectively. In contrast to many other black hole spectra, high energy complexity in the form of a break or cut-off is not required for the hard state, contrary to previous expectations for this state. We show for the first time that Comptonization by non-thermal electrons is the dominant process for the high energy emission in the hard state. We discuss our results in terms of models for broad-band emission and accretion flows in stellar-mass black holes.

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