论文标题
AGN磁盘中的时间依赖性恒星质量二进制黑洞合并：层次合并的质量分布
Time-dependent stellar-mass binary black hole mergers in AGN disks: Mass distribution of hierarchical mergers
论文作者
论文摘要
关于Ligo和Pirgo检测到的恒星质量二进制黑洞（BBH）合并的天体物理起源的通道存在很多争议。活跃的银河核（AGN）是由于高密度气盘在内部半径内的高密度气盘迁移而导致的有效形成和BBH的快速合并的有前途的位点。在本文中，我们进行了蒙特卡洛模拟，以探索随着时间和分层合并的合并的质量特性 - 其中一个黑洞（BHS）是以前合并的残余。我们发现，预测的合并率为$ \ sim 27-37〜 {\ rm gpc^{ - 3} 〜yr^{ - 1}} $，在AGN的后期伴随着极端质量比率合并的Ligo/Pirgo的检测率将增加。层次合并的分数为$ \ sim 24 \％$，其质量比率为$ \ sim 0.15-0.35 $。与层次合并中的低代合并相比，高代合并的质量比在其峰附近具有平坦的分布。这些揭示了Ligo/处女座与极端质量比或重分量质量检测到的BBH合并可以在AGN通道中得到很好的解释。
There is much debate about the channels for astrophysical origins of the stellar-mass binary black hole (BBH) mergers detected by LIGO and Virgo. Active galactic nuclei (AGNs) are promising sites for the efficient formation and rapid mergers of BBHs due to migration traps in high-density gas disks within an inner radii. In this paper, we carry out Monte Carlo simulations to explore the mass properties of mergers over time and hierarchical mergers -- with one of the black holes (BHs) being the remnant of a previous merger. We find that the predicted merger rate is $\sim 27-37~{\rm Gpc^{-3}~yr^{-1}}$ and the detection rate of LIGO/Virgo accompanying with extreme mass-ratio mergers will increase in the late stage of AGNs. The fraction of hierarchical mergers is $\sim 24\%$, and its mass-ratio peak is $\sim 0.15-0.35$. Compared with the low-generation mergers in hierarchical mergers, the mass ratio of high-generation mergers has a flatter distribution around its peak. These reveal that the BBH mergers detected by LIGO/Virgo with the extreme mass ratio or heavy component masses can be well explained in AGN channel.
