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arXiv 1502.03941astro-ph.HE
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快速爆发中II型爆发的群体研究

A population study of type II bursts in the Rapid Burster

T. Bagnoli, J. J. M. in 't Zand, C. R. D'Angelo, D. K. Galloway

摘要:

II型爆发被认为是由X射线双星中的中子星吸积流的不稳定性引起的。尽管已经知道了近40年,但还没有一个模型可以令人满意地解释它们的所有属性。为了阐明这一现象的本质,并为今后的理论工作提供参考,我们研究了来自快速爆发(MXB 1730-335)的II型爆发的罗西X射线定时探测器数据的整个样本。我们发现II型爆发是Eddington限制的流量,更大量的能量比持续发射的爆发,II型爆发可以短至0.130秒,复发时间的分布突然下降到15-18秒以下。我们强调II型爆发和NS表面热核爆炸称为I型爆发之间的复杂反馈,以及II型爆发和持续发射之间的反馈。我们回顾了一些模型的II型爆发。虽然没有模型可以重现所有观察到的突发特性,并解释源的唯一性,涉及门控作用的磁场模型来最接近匹配的属性,我们的样本。这个来源的独特性可以用磁场强度、恒星自转周期和磁场与自转轴之间的排列的特殊组合来解释。

英文摘要:

Type II bursts are thought to arise from instabilities in the accretion flow onto a neutron star in an X-ray binary. Despite having been known for almost 40 years, no model can yet satisfactorily account for all their properties. To shed light on the nature of this phenomenon and provide a reference for future theoretical work, we study the entire sample of Rossi X-ray Timing Explorer data of type II bursts from the Rapid Burster (MXB 1730-335). We find that type II bursts are Eddington-limited in flux, that a larger amount of energy goes in the bursts than in the persistent emission, that type II bursts can be as short as 0.130 s, and that the distribution of recurrence times drops abruptly below 15-18 s. We highlight the complicated feedback between type II bursts and the NS surface thermonuclear explosions known as type I bursts, and between type II bursts and the persistent emission. We review a number of models for type II bursts. While no model can reproduce all the observed burst properties and explain the source uniqueness, models involving a gating role for the magnetic field come closest to matching the properties of our sample. The uniqueness of the source may be explained by a special combination of magnetic field strength, stellar spin period and alignment between the magnetic field and the spin axis.

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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