Ultraluminous X-Ray Sources: Evidence for Very Efficient Formation of Population III Stars Contributing to the Cosmic Near-Infrared Background Excess?
Ultraluminous X-Ray Sources: Evidence for Very Efficient Formation of Population III Stars Contributing to the Cosmic Near-Infrared Background Excess?
复制标题
超亮 X 射线源：III 星族非常有效形成的证据导致宇宙近红外背景过剩？
DOI：
10.1086/430942
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
T. Totani
中科院分区：
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作者：
H. Mii;T. Totani
越来越多的证据表明，一些超亮X射线源（ULX）是中等质量黑洞（IMBH），但IMBH的形成过程是未知的。一种可能性是它们是由第三星族恒星的残余物形成的，但人们认为，对于分布在星系晕中的IMBH来说，ULX的可能性太低，无法解释观测到的ULX数量。在这里，我们表明，ULX的数量可以解释这样的晕IMBH通过一个致密的分子云，如果Pop. III星星的形成是非常有效的，最近建议的过量的宇宙近红外背景辐射，不能占正常的星系人口。我们计算了X射线源的光度函数，发现它与观测数据是一致的。我们的方案可以解释ULX优先在恒星形成区域的大型气体浓度外围发现的事实。指出并讨论了一些重要的物理效应，包括气体动力学摩擦、吸积流的辐射效率以及对周围介质的辐射反馈。ULX可以持续约105-106年，发射的总能量约为1053尔格，这足以为光学观测发现的电离膨胀星云提供动力。
Accumulating evidence indicates that some ultraluminous X-ray sources (ULXs) are intermediate-mass black holes (IMBHs), but the formation process of IMBHs is unknown. One possibility is that they were formed as remnants of Population III (Pop. III) stars, but it has been thought that the probability of being a ULX is too low for IMBHs distributed in galactic halos to account for the observed number of ULXs. Here we show that the number of ULXs can be explained by such halo IMBHs passing through a dense molecular cloud if Pop. III star formation is very efficient as recently suggested by the excess of the cosmic near-infrared background radiation that cannot be accounted for by normal galaxy populations. We calculate the luminosity function of X-ray sources in our scenario and find that it is consistent with observed data. Our scenario can explain the fact that ULXs are preferentially found at the outskirts of large gas concentrations in star-forming regions. A few important physical effects are pointed out and discussed, including gas dynamical friction, radiative efficiency of the accretion flow, and radiative feedback to the ambient medium. ULXs could last for ~105-106 yr to emit a total energy of ~1053 ergs, which is sufficient to power the ionized expanding nebulae found by optical observations.
DOI：
10.1086/320343
发表时间：
2001-04
期刊：
The Astrophysical Journal Letters
影响因子：
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作者：
A. King;M. Davies;M. Ward;G. Fabbiano;M. D. U. O. Leicester;H. C. F. Astrophysics
通讯作者：
A. King;M. Davies;M. Ward;G. Fabbiano;M. D. U. O. Leicester;H. C. F. Astrophysics
T.Totani 等人：“弥散河外背景光与斯巴鲁深场中的深部星系计数：宇宙中缺失的光？”Astrop.J.Letters (2001)
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