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arXiv 1812.04867astro-ph.HE
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中子星X射线双星中吸积态与超相对论外流形成之间的联系

A connection between accretion states and the formation of ultra-relativistic outflows in a neutron star X-ray binary

S. E. Motta, R. P. Fender

摘要:

附近的吸积中子星双星Sco X-1是在高爱丁顿比下持续产生相对论性喷流的最接近的例子。先前的无线电研究已经揭示,伴随着温和的相对论性,无线电发射的喷出物,有时会有一个更快的能量转移从吸积流沿着喷流的区域。这种超相对论性流动的性质仍然不清楚,虽然有一些证据表明在其他可能包含中子星的系统中存在类似的现象,但从未在已证实的黑洞系统中观察到过。我们已经比较了这些以前的无线电观测与一个新的分析,同时X射线观测与RXTE任务。我们发现,超相对论流的喷射似乎与X射线功率谱中两种特定类型的准周期振荡的同时出现有关。相反,相对论性较弱的射电辐射流出可能与X射线功率谱中的平顶宽带噪声有关。这是第一次在这些神秘的看不见的流和它们发射的吸积流之间发现联系,尽管是暂时的。

英文摘要:

The nearby accreting neutron star binary Sco X-1 is the closest example of ongoing relativistic jet production at high Eddington ratios. Previous radio studies have revealed that alongside mildly relativistic, radio-emitting ejecta, there is at times a much faster transfer of energy from the region of the accretion flow along the jet. The nature of this ultrarelativistic flow remains unclear and while there is some evidence for a similar phenomenon in other systems which might contain neutron stars, it has never been observed in a confirmed black hole system. We have compared these previous radio observations with a new analysis of simultaneous X-ray observations which were performed with the RXTE mission. We find that the ejection of the ultra-relativistic flow seems to be associated with the simultaneous appearance of two particular types of quasi-periodic oscillations in the X-ray power spectrum. In contrast, the mildly relativistic, radio-emitting outflows may be associated with flat-topped broad band noise in the X-ray power spectrum. This is the first time a link, albeit tentative, has been found between these mysterious unseen flows and the accretion flow from which they are launched.

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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