SUPERMASSIVE BLACK HOLE FORMATION VIA GAS ACCRETION IN NUCLEAR STELLAR CLUSTERS
SUPERMASSIVE BLACK HOLE FORMATION VIA GAS ACCRETION IN NUCLEAR STELLAR CLUSTERS
复制标题
核星团中气体吸积形成的超大质量黑洞
DOI：
--
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
J. Bellovary
中科院分区：
文献类型：
--
作者：
M. Davies;M. Coleman Miller;J. Bellovary
已检测到红移大于 6 的黑洞质量超过 10 亿个太阳。这些物体的快速形成可能表明存在巨大的早期种子或比爱丁顿更快的生长时期。在这里，我们建议按照这些思路建立一种新机制。我们提出，在分级结构组装过程中，由于质量与星团相当或更大的自引力气体近乎自由落体地流入，致密星团可以在动态时间尺度上收缩。这一过程将速度弥散增加到仅存的少数硬双星无法再有效加热星团的程度，并且星团进入同源核心塌陷期。然后，星团核心可以达到足够高的中心密度，足以实现恒星质量黑洞的快速合并，从而快速产生 105 M☉ 或更大的黑洞种子。
Black holes exceeding a billion solar masses have been detected at redshifts greater than six. The rapid formation of these objects may suggest a massive early seed or a period of growth faster than Eddington. Here we suggest a new mechanism along these lines. We propose that in the process of hierarchical structure assembly, dense star clusters can be contracted on dynamical timescales due to the nearly free-fall inflow of self-gravitating gas with a mass comparable to or larger than that of the clusters. This process increases the velocity dispersion to the point where the few remaining hard binaries can no longer effectively heat the cluster, and the cluster goes into a period of homologous core collapse. The cluster core can then reach a central density high enough for fast mergers of stellar-mass black holes and hence the rapid production of a black hole seed that could be 105 M☉ or larger.