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arXiv 1812.04483astro-ph.HEastro-ph.SR
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关于超巨星快X射线瞬变的起源

On the origin of supergiant fast X-ray transients

Swetlana Hubrig, Lara Sidoli, Konstantin A. Postnov, Markus Schöller, Alexander F. Kholtygin, Silva P. Jarvinen

摘要:

一小部分高质量X射线双星是超巨星快速X射线瞬变。这些系统的平均X射线亮度较低,但在短耀斑期间,它们的X射线亮度会上升几个数量级。主导这种X射线行为的物理模型表明,捐赠者OB超巨星的风是磁化的。与此模型一致,在甚大望远镜上使用FORS 2仪器对SFXT IGR J11215-5952进行的第一次分光偏振观测表明存在kG纵向磁场。基于这些结果,超巨星快速X射线瞬变和其他高质量X射线双星之间的关键区别可能是超巨星的恒星风的性质以及风与中子星磁层相互作用的物理性质。

英文摘要:

A fraction of high-mass X-ray binaries are supergiant fast X-ray transients. These systems have on average low X-ray luminosities, but display short flares during which their X-ray luminosity rises by a few orders of magnitude. The leading model for the physics governing this X-ray behaviour suggests that the winds of the donor OB supergiants are magnetized. In agreement with this model, the first spectropolarimetric observations of the SFXT IGR J11215-5952 using the FORS2 instrument at the Very Large Telescope indicate the presence of a kG longitudinal magnetic field. Based on these results, it seems possible that the key difference between supergiant fast X-ray transients and other high-mass X-ray binaries are the properties of the supergiant's stellar wind and the physics of the wind's interaction with the neutron star magnetosphere.

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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