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arXiv 1106.1645astro-ph.HE
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银河系黑洞硬态X射线辐射机制变化的证据

Evidence for a change in the X-ray radiation mechanism in the hard state of Galactic black holes

M. A. Sobolewska, I. E. Papadakis, C. Done, J. Malzac

摘要:

本文研究了两个银河系黑洞X射线双星GRO J1655-40和GX 339-4在硬态下的光谱变化。我们确认的光子指数与光度的行为的过渡,这样,众所周知的减少X射线光子指数与降低光度只继续下降到L_bol ~ 0.01 L_Edd。在该点以下,光子指数再次增加。对于康普顿化模型,这意味着康普顿光度与种子光子光度的比率,lh/ls,随着测热光度的变化而变化,与种子光子从最低光度的回旋同步加速器变化到截断圆盘的情况一致。或者,这种转变可能标志着非热喷流开始占主导地位的点,或者在流出的日冕模型中,再处理的光子取代粘性光子的点。

英文摘要:

We present results on spectral variability of two Galactic black hole X-ray binaries, GRO J1655-40 and GX 339-4, in the hard state. We confirm a transition in behaviour of the photon index with luminosity, such that the well known decrease in X-ray photon index with decreasing luminosity only continues down to L_bol ~ 0.01 L_Edd . Below this point the photon index increases again. For Comptonisation models, this implies that the ratio of the Compton luminosity to seed photon luminosity, lh/ls, changes with bolometric luminosity, consistent with a scenario where seed photons change from cyclo-synchrotron at the lowest luminosities to those from a truncated disc. Alternatively, the transition could mark the point below which the non-thermal jet starts to dominate, or where reprocessed photons replace the viscous ones in an outflowing corona model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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