Can isolated single black holes produce X-ray novae?
Can isolated single black holes produce X-ray novae?
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DOI：
10.1093/mnras/stx3148
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发表时间：
2017-04
影响因子：
4.8
通讯作者：
T. Matsumoto;Yuto Teraki;K. Ioka
中科院分区：
文献类型：
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作者：
T. Matsumoto;Yuto Teraki;K. Ioka
我们银河系中几乎所有的黑洞（BH）和BH候选者都被发现为软X射线瞬变，即所谓的X射线新星。X射线新星通常被认为是来自双星系统。在这里，我们提出，X射线新星也是由孤立的单个黑洞。计算了星际物质对孤立黑洞吸积率的分布，发现分子云中的黑洞满足氢电离盘不稳定性条件，从而产生X射线新星。估计的事件发生率与观察到的事件发生率一致。可能的候选包括IGR J17454-2919、XTE J1908-094和SAX J1711.6-3808。近红外测光和光谱的后续工作可以排除我们银河系BH普查的伴星。
Almost all black holes (BHs) and BH candidates in our Galaxy have been discovered as soft X-ray transients, so-called X-ray novae. X-ray novae are usually considered to arise from binary systems. Here we propose that X-ray novae are also caused by isolated single BHs. We calculate the distribution of the accretion rate from interstellar matter to isolated BHs, and find that BHs in molecular clouds satisfy the condition of the hydrogen-ionizaiton disk instability, which results in X-ray novae. The estimated event rate is consistent with the observed one. Possible candidates include IGR J17454-2919, XTE J1908-094, and SAX J1711.6-3808. Near infrared photometric and spectroscopic follow-ups can exclude companion stars for a BH census in our Galaxy.