含黑洞的Be X射线双星的表观缺失
On the Apparent Lack of Be X-ray Binaries with Black Holes
摘要：
在银河系中，迄今已知有64颗Be X射线双星。其中，42颗拥有一颗中子星，提醒一下，伴星的性质还不清楚。到目前为止，还没有发现黑洞。似乎没有明显的机制可以阻止带有黑洞的Be星的形成或探测。这种差异被称为一个失踪的Be -黑洞X射线二元问题。我们指出，目前的演化方案，导致形成的Be X射线双星预测，这些双星的比例与中子星的黑洞是相当高的F_NStoBH=10-50，与更可能的形成模型提供的值在高端。这个比值是恒星初始质量函数产生的中子星比产生的黑洞多和普通包层演化的自然结果自然选择带有中子星的Be X射线双星的祖先的一种机制（即参与形成相互作用双星的主要机制（具有可比质量分量的双星具有更可能的生存概率）而不是具有黑洞的双星（更可能是常见的包络合并）。将这个比值（即F_NStoBH=30）与已确认的Be --中子星X射线双星的数目（42）相比较，表明Be --黑洞X射线双星的预期数目仅为0-2。这与观测到的银河系样本完全一致。
英文摘要：
In the Galaxy there are 64 Be X-ray binaries known to-date. Out of those, 42 host a neutron star, and for the reminder the nature of a companion is not known. None, so far, is known to host a black hole. There seems to be no apparent mechanism that would prevent formation or detection of Be stars with black holes. This disparity is referred to as a missing Be -- black hole X-ray binary problem. We point out that current evolutionary scenarios that lead to the formation of Be X-ray binaries predict that the ratio of these binaries with neutron stars to the ones with black holes is rather high F_NStoBH=10-50, with the more likely formation models providing the values at the high end. The ratio is a natural outcome of (i) the stellar initial mass function that produces more neutron stars than black holes and (ii) common envelope evolution (i.e. a major mechanism involved in the formation of interacting binaries) that naturally selects progenitors of Be X-ray binaries with neutron stars (binaries with comparable mass components have more likely survival probabilities) over ones with black holes (which are much more likely to be common envelope mergers). A comparison of this ratio (i.e. F_NStoBH=30) with the number of confirmed Be -- neutron star X-ray binaries (42) indicates that the expected number of Be -- black hole X-ray binaries is of the order of only 0-2. This is entirely consistent with the observed Galactic sample.
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。
