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arXiv 1702.02197astro-ph.HE
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质量尺度上黑洞风的磁起源

Magnetic Origin of Black Hole Winds Across the Mass Scale

Keigo Fukumura, Demosthenes Kazanas, Chris Shrader, Ehud Behar, Francesco Tombesi, Ioannis Contopoulos

摘要:

黑洞吸积盘似乎总是产生等离子体流出,从而导致其光谱中的吸收特征蓝移。这些流出物的X射线吸收线性质是相当不同的,速度范围从非相对论性($\sim 300$ km/sec)到亚相对论性($\sim 0.1c$,其中$c$是光速),并且在风等离子体的电离状态中具有类似的宽范围。我们在这里报告,半解析,自相似磁流体动力学(MHD)风模型,已成功地占X射线吸收性质的超大质量黑洞,也适合高分辨率X射线光谱吸积恒星质量黑洞,GRO J1655-40。这为它们的MHD起源提供了一个明确的理论论据(与早期的观测声明一致),并支持了在所有已知的黑洞尺寸上观察到的风的普遍磁性结构的概念。

英文摘要:

Black hole accretion disks appear to produce invariably plasma outflows that result in blue-shifted absorption features in their spectra. The X-ray absorption-line properties of these outflows are quite diverse, ranging in velocity from non-relativistic ($\sim 300$ km/sec) to sub-relativistic ($\sim 0.1c$ where $c$ is the speed of light) and a similarly broad range in the ionization states of the wind plasma. We report here that semi-analytic, self-similar magnetohydrodynamic (MHD) wind models that have successfully accounted for the X-ray absorber properties of supermassive black holes, also fit well the high-resolution X-ray spectrum of the accreting stellar-mass black hole, GRO J1655-40. This provides an explicit theoretical argument of their MHD origin (aligned with earlier observational claims) and supports the notion of a universal magnetic structure of the observed winds across all known black hole sizes.

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