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arXiv 2104.13384astro-ph.HEastro-ph.GAastro-ph.SR
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对不稳定质量隙外的粒子数III双黑洞合并

On the population III binary black hole mergers beyond the pair-instability mass gap

Kotaro Hijikawa, Ataru Tanikawa, Tomoya Kinugawa, Takashi Yoshida, Hideyuki Umeda

摘要:

我们进行了一个二进制人口合成计算纳入非常庞大的人口(人口)。III星高达1500 $M_\odot$,并调查性质的二元黑洞(BBH)合并。在对不稳定质量隙以上,我们发现典型的初级黑洞(BH)质量为135-340 $M_\odot$ .最大原发BH质量为686 $M_\odot$。两个组分都在质量隙以上的BBH具有低的有效内旋自旋$\sim$ 0。到目前为止,没有确凿的BBH合并超出了质量差距已被检测到,并在合并率密度的上限。如果把Pop. III星的初始质量函数(IMF)简单地表示为$ξ_m(m) \propto m^{-α}$(单次幂律),我们发现,为了使合并率密度不超过上界,需要$α\gtrsim 2.8$。未来的引力波探测器如Einstein望远镜和Pre-DECIGO将在高红移处观测到BBH并合。我们建议,我们可能能够施加一个严格的限制,人口。III IMF的合并率密度从未来的观测结果与理论推导的比较。

英文摘要:

We perform a binary population synthesis calculation incorporating very massive population (Pop.) III stars up to 1500 $M_\odot$, and investigate the nature of binary black hole (BBH) mergers. Above the pair-instability mass gap, we find that the typical primary black hole (BH) mass is 135-340 $M_\odot$. The maximum primary BH mass is as massive as 686 $M_\odot$. The BBHs with both of their components above the mass gap have low effective inspiral spin $\sim$ 0. So far, no conclusive BBH merger beyond the mass gap has been detected, and the upper limit on the merger rate density is obtained. If the initial mass function (IMF) of Pop. III stars is simply expressed as $ξ_m(m) \propto m^{-α}$ (single power law), we find that $α\gtrsim 2.8$ is needed in order for the merger rate density not to exceed the upper limit. In the future, the gravitational wave detectors such as Einstein telescope and Pre-DECIGO will observe BBH mergers at high redshift. We suggest that we may be able to impose a stringent limit on the Pop. III IMF by comparing the merger rate density obtained from future observations with that derived theoretically.

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