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arXiv 1802.04549astro-ph.HE
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非均匀吸积流的Fe Kα线轮廓

The Profiles of Fe Kα Line From the Inhomogeneous Accretion Flow

Xiao-Di Yu, Ren-Yi Ma, Ya-Ping Li, Hui Zhang, Tao-Tao Fang

摘要:

非均匀吸积流被用来解释吸积黑洞系统的性质。然而,观察证据仍有待探索。本文利用射线追迹技术计算了非均匀吸积流中Fe Kα线的轮廓,以寻找可能观测到的团簇信号。与连续标准吸积盘的斜双峰轮廓相比,当发射率指数不是很陡时,谱线呈现多峰结构。峰和翼受冷团的位置和大小的影响。当团簇很小并且位于最里面的区域时,由于显著的引力红移,蓝翼可以与外部冷盘/团簇的红翼重叠,形成假峰或大大增强红峰。在足够高的分辨率下,由于热多普勒效应的存在,超大质量黑洞周围的团块比恒星质量黑洞中的团块更容易被约束。

英文摘要:

The clumpy disc, or inhomogeneous accretion flow, has been proposed to explain the properties of accreting black hole systems. However, the observational evidences remain to be explored. In this work, we calculate the profiles of Fe Kα lines emitted from the inhomogeneous accretion flow through the ray-tracing technique, in order to find possible observable signals of the clumps. Compared with the skewed doublepeaked profile of the continuous standard accretion disc, the lines show a multi-peak structure when the emissivity index is not very steep. The peaks and wings are affected by the position and size of the cold clumps. When the clump is small and is located in the innermost region, due to the significant gravitational redshift, the blue wing can overlap with the red wing of the outer cold disc/clump, forming a fake peak or greatly enhancing the red peak. Given high enough resolution, it is easier to constrain the clumps around the supermassive black holes than the clumps in stellar mass black holes due to the thermal Doppler effect.

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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