arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.04740astro-ph.GA
收藏

引力反冲在大质量黑洞种子聚集中的作用

The role of gravitational recoil in the assembly of massive black hole seeds

Glenna Dunn, Kelly Holley-Bockelmann, Jillian Bellovary

摘要:

当两个黑洞合并时,引力波的不对称发射为合并的系统提供了一个脉冲;这个引力波反冲速度可以达到4000 km/s $^{-1}$,足以让黑洞逃离它的宿主星系。我们结合半解析建模与宇宙学放大模拟的银河系型星系调查的作用,黑洞自旋和引力反冲的时代的大规模黑洞播种。我们采样四种不同的自旋分布(随机,对齐,反对齐,零自旋),并比较由此产生的合并率,占用分数,MBH主机的关系与预期的不包括反冲的影响。在MBH籽晶的组装中包括重力反冲和MBH自旋可以将最终的$z=5$ MBH质量降低高达一个数量级。然而,由于反冲事件后黑洞形成的插曲,MBH占据分数保持有效不变。虽然不太可能对这些事件进行电磁探测,但LISA非常适合探测来自此类事件的引力波信号。

英文摘要:

When two black holes merge, the asymmetric emission of gravitational waves provides an impulse to the merged system; this gravitational wave recoil velocity can be up to 4000 km s$^{-1}$, easily fast enough for the black hole to escape its host galaxy. We combine semi-analytic modeling with cosmological zoom-in simulations of a Milky Way-type galaxy to investigate the role of black hole spin and gravitational recoil in the epoch of massive black hole seeding. We sample four different spin distributions (random, aligned, anti-aligned, and zero spin), and compare the resulting merger rates, occupation fractions, and MBH-host relations with what is expected by excluding the effect of recoil. The inclusion of gravitational recoil and MBH spin in the assembly of MBH seeds can reduce the final $z=5$ MBH mass by up to an order of magnitude. The MBH occupation fraction, however, remains effectively unaltered due to episodes of black hole formation following a recoil event. While electromagnetic detections of these events are unlikely, LISA is ideally suited to detect gravitational wave signals from such events.

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。

↑