Magnetic origin of black hole winds across the mass scale
Magnetic origin of black hole winds across the mass scale
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黑洞的磁起源在质量尺度上缠绕
DOI：
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发表时间：
2017
期刊：
影响因子：
14.1
通讯作者：
I. Contopoulos
中科院分区：
文献类型：
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作者：
K. Fukumura;D. Kazanas;C. Shrader;E. Behar;F. Tombesi;I. Contopoulos
黑洞吸积盘似乎总是会产生等离子体流出，导致其光谱中的蓝移吸收特征。这些流出物的x射线吸收线特性是多种多样的，其速度范围从非相对论2 （~300 km s-1）到次相对论3 （~0.1c，其中c为光速），并且在风等离子体的电离状态中也有类似的宽范围2,4。我们在这里报告说，半解析的、自相似的磁流体动力学风模型已经成功地解释了超大质量黑洞的x射线吸收特性5,6，也很好地适合于吸积恒星质量黑洞GRO J1655-40的高分辨率x射线光谱。这为它们的磁流体动力学起源提供了一个明确的理论论证（与早期的观测结果一致），并支持了在所有已知大小的黑洞中观测到的风具有普遍磁性结构的概念。超大质量黑洞周围流出物的磁流体动力学模型也可以重现恒星黑洞周围流出物的x射线特性。这表明磁力在驱动这些风的过程中起着普遍的作用。
Invariably, black hole accretion disks seem to produce plasma outflows that result in blue-shifted absorption features in their spectra1. The X-ray absorption-line properties of these outflows are diverse, ranging in velocity from non-relativistic2 (~300 km s–1) to sub-relativistic3 (~0.1c, where c is the speed of light) and a similarly broad range in the ionization states of the wind plasma2,4. We report here that semi-analytical, self-similar magnetohydrodynamic wind models that have successfully accounted for the X-ray absorber properties of supermassive black holes5,6 also offer a good fit to the high-resolution X-ray spectrum of the accreting stellar-mass black hole GRO J1655–40. This provides an explicit theoretical argument of their magnetohydrodynamic origin (aligned with earlier observational claims)7 and supports the notion of a universal magnetic structure of the observed winds across all known black hole sizes. A magnetohydrodynamic model for outflows around supermassive black holes can also reproduce the X-ray properties of an outflow around a stellar black hole. This indicates that magnetic forces have a universal role to play in driving these winds.