arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.01032astro-ph.HE
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I型X射线暴与薄吸积盘的相互作用

Interactions of Type I X-ray Bursts with Thin Accretion Discs

P. Chris Fragile, David R. Ballantyne, Aidan Blankenship

摘要:

我们进行了一组数值实验,研究I型X射线爆发与薄,Shakura-Sunyaev型吸积盘的相互作用。在这种爆发期间对X射线光谱的仔细观察暗示了圆盘内部区域发生的变化。我们现在清楚地展示了一些同时发生的关键效应,包括:沿着盘表面的弱辐射驱动外流的证据;显着水平的坡印廷-罗伯逊(PR)阻力,导致增强吸积;和突出的加热盘,增加了高度,同时降低了密度和光学深度。PR阻力导致圆盘的内边缘从中子星表面向更大的半径撤退,然后在爆发的时间尺度上恢复。我们的结论是,丰富的相互作用的X射线爆发与周围的光盘提供了一种新的方式来研究物理吸积到紧凑的对象。

英文摘要:

We perform a set of numerical experiments studying the interaction of Type I X-ray bursts with thin, Shakura-Sunyaev type accretion discs. Careful observations of X-ray spectra during such bursts have hinted at changes occurring in the inner regions of the disc. We now clearly demonstrate a number of key effects that take place simultaneously, including: evidence for weak, radiation-driven outflows along the surface of the disc; significant levels of Poynting-Robertson (PR) drag, leading to enhanced accretion; and prominent heating in the disc, which increases the height, while lowering the density and optical depth. The PR drag causes the inner edge of the disc to retreat from the neutron star surface toward larger radii and then recover on the timescale of the burst. We conclude that the rich interaction of an X-ray burst with the surrounding disc provides a novel way to study the physics of accretion onto compact objects.

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