The growth of black holes from Population III remnants in the Renaissance simulations
The growth of black holes from Population III remnants in the Renaissance simulations
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DOI：
10.1093/mnras/sty2103
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发表时间：
2018-04
影响因子：
4.8
通讯作者：
Britton D. Smith;J. Regan;T. Downes;M. Norman;B. O’Shea;J. Wise
中科院分区：
文献类型：
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作者：
Britton D. Smith;J. Regan;T. Downes;M. Norman;B. O’Shea;J. Wise
第三族恒星残余物形成的恒星质量黑洞提供了初始黑洞种子的来源，有可能成长为中等质量黑洞，在极少数情况下可能成长为超大质量黑洞。我们使用 Renaissance 模拟套件来跟踪早期宇宙中诞生于迷你光晕中的 15,000 多个黑洞的生长。黑洞填充了从 10^6 Msun 到 10^9 Msun 的光晕。我们发现所有黑洞的增长效率都非常低。平均而言，黑洞的初始质量增加了 10^-5 倍，最活跃的黑洞质量增加了大约 10%。只有单个黑洞会经历任何时期的超爱丁顿吸积，但持续时间非常短且不会重复。此外，我们发现在采样的质量范围内黑洞吸积与晕质量没有相关性。在大多数光晕中，我们发现了冷而致密的气体团块，其吸积率很高，但黑洞遇到这些团块的情况很少见且短暂。恒星形成通过消耗可用气体并通过反馈降低吸积率来与黑洞生长竞争。我们得出的结论是，从第三族残余物中诞生的黑洞在早期宇宙中不会形成大量的中等质量黑洞，并且需要等到以后才能经历显着的吸积（如果有的话）。
The formation of stellar mass black holes from the remnants of Population III stars provides a source of initial black hole seeds with the potential to grow into intermediate or, in rare cases, possibly supermassive black holes. We use the Renaissance simulation suite to follow the growth of over 15,000 black holes born into mini-haloes in the early Universe. The black holes populate haloes from 10^6 Msun up to 10^9 Msun. We find that all of the black holes display very inefficient growth. On average the black holes increase their initial mass by a factor 10^-5, with the most active black holes increasing their mass by approximately 10%. Only a single black hole experiences any period of super-Eddington accretion, but the duration is very short and not repeated. Furthermore, we find no correlation of black hole accretion with halo mass in the mass range sampled. Within most haloes, we identify clumps of cool, dense gas for which accretion rates would be high, but instances of black holes encountering these clumps are rare and short-lived. Star formation competes with black hole growth by consuming available gas and driving down accretion rates through feedback. We conclude that the black holes born from Population III remnants do not form a significant population of intermediate mass black holes in the early Universe and will need to wait until later times to undergo significant accretion, if at all.