ACCRETION-JET MODEL FOR THE HARD X-ray Γ - L X CORRELATION IN BLACK HOLE X-ray BINARIES
ACCRETION-JET MODEL FOR THE HARD X-ray Γ - L X CORRELATION IN BLACK HOLE X-ray BINARIES
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DOI：
10.5303/pkas.2015.30.2.565
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发表时间：
2015-09
期刊：
影响因子：
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通讯作者：
Qi-Xiang Yang;F. Xie;F. Yuan;A. Zdziarski;M. Gierliński;L. Ho;Zhaolong Yu
中科院分区：
文献类型：
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作者：
Qi-Xiang Yang;F. Xie;F. Yuan;A. Zdziarski;M. Gierliński;L. Ho;Zhaolong Yu
本文研究了黑洞X射线双星X射线谱的光子指数（Xmax）与2-10 keV X射线光度（LX）之间的相关性。BHB样品主要来自静态、硬态和中间态，LX值范围为10 30.5至10 37.5 erg s-1。结果表明，当LX高于或低于一个临界值1036.5erg·s-1时，光子指数λ与X射线光度LX呈正或负相关。这一结果与前人的工作是一致的。当LX ≤ ~ 1033 ergs-1时，光子指数与X射线光度基本无关。我们在一个热吸积流-喷流耦合模型的框架下解释了上述关系.此外，我们还发现在中等亮度区域，不同的源可能具有不同的反相关斜率，我们认为这种差异是由描述直接加热电子的湍流耗散部分δ的不同值引起的。
In this work, we study the correlation between the photon index (Г) of the X-ray spectrum and the 2-10 keV X-ray luminosity (LX) for black hole X-ray binaries (BHBs). The BHB sample is mainly from the quiescent, hard and intermediate states, with values of LX ranging from 10 30.5 to 10 37.5 erg s -1 . We nd that the photon index Г is positively or negatively correlated with the X-ray luminosity L X , for L X above or below a critical value, 1036.5 erg s -1 . This result is consistent with previous works. Moreover, when L X ≤ ~10 33 erg s -1 , we found that the photon index is roughly independent of the X-ray luminosity. We interpret the above correlations in the framework of a coupled hot accretion flow - jet model. Besides, we also find that in the moderate-luminosity region, different sources may have different anti-correlation slopes, and we argue this diversity is caused by the different value of δ, which describes the fraction of turbulent dissipation that directly heats electrons.