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arXiv 1405.0474astro-ph.HE
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吸积黑洞的静态X射线谱

The Quiescent X-ray Spectrum of Accreting Black Holes

Mark T. Reynolds, Rubens C. Reis, Jon M. Miller, Edward M. Cackett, Nathalie Degenaar

摘要:

静态是所有质量尺度上黑洞的主要吸积模式。我们对X射线光谱的了解是有限的,因为在这种状态下,X射线的亮度很低。在这里,我们提出了一个分析的样本的动态确认的恒星质量的黑洞在静止中观察到的\textit{Chandra/XMM-Newton/Suzaku}时代导致一个样本的8个黑洞与$\sim$ 570 ks的意见。与大多数活动星系核的观测受到扩散气体污染的限制相反,恒星质量系统允许对仅由吸积流产生的X射线光谱进行干净的研究。数据的特点是使用简单的模型。我们发现一个模型组成的幂律或热韧致辐射都提供了很好的描述的数据,在那里我们测量$\rm Γ= 2.06 \pm 0.03$和$\rm kT = 5.03^{+0.33}_{-0.31} keV$分别在0.3 - 10千电子伏的带通,在一个中值光度为$\rm L_x \sim 5.5\times10^{-7} L_{Edd}$。这一结果的背景下,讨论了我们的理解吸积流到恒星和超大质量黑洞在低光度。

英文摘要:

The quiescent state is the dominant accretion mode for black holes on all mass scales. Our knowledge of the X-ray spectrum is limited due to the characteristic low luminosity in this state. Herein, we present an analysis of the sample of dynamically-confirmed stellar-mass black holes observed in quiescence in the \textit{Chandra/XMM-Newton/Suzaku} era resulting in a sample of 8 black holes with $\sim$ 570 ks of observations. In contrast to the majority of AGN where observations are limited by contamination from diffuse gas, the stellar-mass systems allow for a clean study of the X-ray spectrum resulting from the accretion flow alone. The data are characterized using simple models. We find a model consisting of a power-law or thermal bremsstrahlung to both provide excellent descriptions of the data, where we measure $\rm Γ= 2.06 \pm 0.03$ and $\rm kT = 5.03^{+0.33}_{-0.31} keV$ respectively in the 0.3 -- 10 keV bandpass, at a median luminosity of $\rm L_x \sim 5.5\times10^{-7} L_{Edd}$. This result in discussed in the context of our understanding of the accretion flow onto stellar and supermassive black holes at low luminosities.

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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