arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2204.08802astro-ph.HE
收藏

GRO J1655-40中黑洞吸积盘产生的风的动力是什么?

What powers the wind from the black hole accretion disc in GRO J1655-40?

Ryota Tomaru, Chris Done, Junjie Mao

摘要:

黑洞吸积盘可以产生强大的外流等离子体(盘风),在恒星和超大质量系统中被视为蓝移的吸收线。类星体中的这些风在控制整个宇宙时间的星系形成方面起着至关重要的作用,但对于这些风是如何物理发射的,人们还没有达成共识。对恒星质量黑洞GRO J1655-40的一次独特观测被用来论证磁驱动是双星和类星体中唯一可行的机制,并激发了磁风的统一模型。另一种选择,X射线加热(热辐射风),被排除在低观测光度的高风密度估计从一个亚稳态水平的Fe二十二吸收线。在这里,我们重新分析这些数据使用光电离代码,包括级联辐射激发以及碰撞填充亚稳态水平。叶栅将推断的风密度降低了一个数量级以上。导出的柱也是光学厚的,所以源本质上比观察到的更亮。我们表明,从辐射流体动力学模拟计算的热辐射风模型与数据相匹配。我们重新审视以前的磁风解决方案,并表明,这也是光学厚,导致更大的源光度。然而,与热辐射风不同的是,它很难以所需的密度再现整个离子群。这些结果去除了这些数据中对磁风的要求,并去除了外推到类星体外流的自相似统一磁风模型的基础

英文摘要:

Black hole accretion discs can produce powerful outflowing plasma (disc winds), seen as blue-shifted absorption lines in stellar and supermassive systems. These winds in Quasars have an essential role in controlling galaxy formation across cosmic time, but there is no consensus on how these are physically launched. A single unique observation of a stellar-mass black hole GRO J1655-40 was used to argue that magnetic driving was the only viable mechanism and motivated unified models of magnetic winds in both binaries and Quasars. The alternative, X-ray heating (thermal-radiative wind), was ruled out for the low observed luminosity by the high wind density estimated from an absorption line of a metastable level of Fe xxii. Here we reanalyse these data using a photoionisation code that includes cascades from radiative excitation as well as collisions in populating the metastable level. The cascade reduces the inferred wind density by more than an order of magnitude. The derived column is also optically thick, so the source is intrinsically more luminous than observed. We show that a thermal-radiative wind model calculated from a radiation hydrodynamic simulation matches well with the data. We revisit the previous magnetic wind solution and show that this is also optically thick, leading to a larger source luminosity. However, unlike the thermal-radiative wind, it struggles to reproduce the overall ion population at the required density. These results remove the requirement for a magnetic wind in these data and remove the basis of the self-similar unified magnetic wind models extrapolated to Quasar outflows

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。

↑