...
首页> 外文期刊>Journal of astrophysics and astronomy >Role of primordial black holes in the direct collapse scenario of supermassive black hole formation at high redshifts
【24h】

Role of primordial black holes in the direct collapse scenario of supermassive black hole formation at high redshifts

机译:原始黑洞在高红移下超大规模黑洞形成的直接塌陷中的作用

获取原文
           

摘要

In this paper, we explore the possibility of accreting primordial black holes as the source of heating for the collapsing gas in the context of the direct collapse black hole scenario for the formation of super-massive black holes (SMBHs) at high redshifts, $z sim 6a??7$. One of the essential requirements for the direct collapse model to work is to maintain the temperature of the in-falling gas at $pprox$104 K. We show that even under the existingabundance limits, the primordial black holes of masses $gtrsim$10a??2M$_{odot}$, can heat the collapsing gas to an extent that the H$_2$ formation is inhibited. The collapsing gas can maintain its temperature at 104 K till the gas reachesa critical density $n_c pprox 10^3$ cm$^{a??3}$, at which the roto-vibrational states of H$_2$ approaches local thermodynamicequilibrium and H$_2$ cooling becomes inefficient. In the absence of H$_2$ cooling, the temperature of the collapsing gas stays at $pprox$10$^4$ Keven as it collapses further. We discuss scenarios of subsequent angular momentum removaland the route to find collapse through either a supermassive star or a supermassive disk.
机译:在本文中,我们探讨了在高红移$ z形成超大质量黑洞(SMBHs)的直接塌陷黑洞情形下,将原始黑洞作为塌陷气体的热源的可能性。 sim 6a ?? 7 $。直接坍缩模型正常运行的基本要求之一是将流入的气体的温度保持在$ 约104K。我们证明,即使在现有的丰度限制下,质量为$ gtrsim $ 10a的原始黑洞也是如此。 2M $ _ { odot} $可以将塌陷的气体加热到一定程度,从而抑制了H $ _2 $的形成。崩溃的气体可以将其温度保持在104 K,直到该气体达到临界密度$ n_c 大约10 ^ 3 $ cm $ ^ {a ?? 3} $,在该临界密度下,H $ _2 $的旋转振动状态接近局部热力学平衡。 H $ _2 $的冷却效率低下。在没有H $ _2 $冷却的情况下,崩溃气体的温度保持在$ 约10 $ ^ 4 $ Keven,因为它进一步崩溃了。我们讨论了随后的角动量去除的场景以及通过超大质量恒星或超大质量圆盘找到坍塌的路线。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号