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arXiv 2307.02853astro-ph.HE
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黑洞X射线双星中瞬态喷流及其空腔的形成与演化

Formation and evolution of transient jets and their cavities in black-hole X-ray binaries

Marek Sikora, Andrzej Zdziarski

AI总结:

本文提出黑洞X射线双星中瞬态喷流源于准直磁化喷流向非准直外流转变的模型,解释离散抛射、低密度空腔形成及抛射物减速微弱等观测现象。

摘要:

我们提出了一个模型来解释黑洞X射线双星中瞬态/间歇性喷流的起源,其中这些喷流是由从准直、强磁化的喷流向宽阔、非准直外流的转变所引起。当吸积流由于吸积率增加而磁通量变化较弱时,会离开磁阻塞状态,从而发生这种变化。随后形成的强大喷流脱离其底部,并作为离散抛射物传播。非准直外流随后产生相对论性等离子体,填充黑洞周围环境,有助于形成低密度空腔。虽然空腔内的压力与周围星际介质(ISM)处于平衡状态,但其惯性比ISM低几个数量级。这意味着等离子体无法有效减速抛射物,从而解释了大多数观测结果。在某些情况下观测到的空腔内适度减速,则可能是由于云和/或丝状结构的存在,它们在空腔与ISM之间形成了一个宽阔的过渡区。

英文摘要:

We propose a model explaining the origin of transient/episodic jets in black-hole X-ray binaries, in which they are caused by transitions from a collimated, strongly magnetized, jet to a wide, un-collimated, outflow. The change occurs when the accretion flow leaves the magnetically-choked state due to an increase of the accretion rate for a weakly varying magnetic flux. The formed powerful jet then detaches from its base, and propagates as a discrete ejection. The uncollimated outflow then produces a relativistic plasma that fills surrounding of the black hole, contributing to the formation of a low-density cavity. While the pressure in the cavity is in equilibrium with the surrounding interstellar medium (ISM), its inertia is orders of magnitude lower than that of the ISM. This implies that the plasma cannot efficiently decelerate the ejecta, explaining most of the observations. The modest deceleration within the cavities observed in some cases can be then due to the presence of clouds and/or filaments, forming a wide transition zone between the cavity and the ISM.

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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