论文标题
人口III星团中间质量黑洞的重力波
Gravitational wave of intermediate-mass black holes in Population III star clusters
论文作者
论文摘要
以前的理论研究表明，人口III（POP3）恒星倾向于在极差的气体云中形成，大约$ 10^5 m_ \ odot $嵌入了迷你暗物质晕圈中。非常巨大的恒星可以通过POP3恒星簇中的多个碰撞形成，并最终演变为中间质量的黑洞（IMBHS）。在这项工作中，我们进行了按星级$ n $ n $模拟进行建模POP3星团的长期演变。我们发现，如果今天的迷你暗物质光环可以在今天生存，这些恒星簇可以避免银河环境的潮汐破坏，并且可以在从0到20的广泛红移之间有效地产生IMBH-BH合并。平均重力波动率估计为$ 0.1-0.8〜〜 \ \ \ \ \ \ \ \ \ \ yr {yr}^yr {yr}^yr} \ mathrm {gpc}^{ - 3} $，大约$ 40-80 $的合并出现在高红移（$ z> 6 $）上。特征性菌株表明，Lisa，Tianqin和Taiji可以检测到低红移合并的一部分，而大多数合并可以被Decigo和Advanced Ligo/Virgo/Kagra覆盖。具有配对稳定性BHS的合并的速率约为$ 0.01-0.15 $ 〜yr $^{ - 1} $ 〜GPC $^{ - 3} $，可以解释GW190521类似于GW190521的事件。
Previous theoretical studies suggest that the Population III (Pop3) stars tend to form in extremely metal poor gas clouds with approximately $10^5 M_\odot$ embedded in mini dark matter halos. Very massive stars can form via multiple collisions in Pop3 star clusters and eventually evolve to intermediate-mass black holes (IMBHs). In this work, we conduct star-by-star $N$-body simulations for modelling the long-term evolution of Pop3 star clusters. We find that if the mini dark matter halos can survive today, these star clusters can avoid tidal disruption by the galactic environment and can efficiently produce IMBH-BH mergers among a wide range of redshift from 0 to 20. The average gravitational wave event rate is estimated to be $0.1-0.8~\mathrm{yr}^{-1} \mathrm{Gpc}^{-3}$, and approximately $40-80$ percent of the mergers occur at high redshift ($z>6$). The characteristic strain shows that a part of low-redshift mergers can be detected by LISA, TianQin, and Taiji, whereas most mergers can be covered by DECIGO and advanced LIGO/VIRGO/Kagra. Mergers with pair-instability BHs have a rate of approximately $0.01-0.15$~yr$^{-1}$~Gpc$^{-3}$, which can explain the GW190521-like events.
