Merger Rates of Intermediate-mass Black Hole Binaries in Nuclear Star Clusters

被引：27

作者：

Fragione, Giacomo ^{[1
,2
,3
]}

Loeb, Abraham ^{[4
]}

Kocsis, Bence ^{[5
]}

Rasio, Frederic A. ^{[1
,2
,3
]}

机构：

[1] Northwestern Univ, Ctr Interdisciplinary Explorat & Res Astrophys CI, Evanston, IL 60208 USA

[2] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA

[3] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60202 USA

[4] Harvard Univ, Astron Dept, 60 Garden St, Cambridge, MA 02138 USA

[5] Clarendon Lab, Rudolf Peierls Ctr Theoret Phys, Parks Rd, Oxford OX1 3PU, England

来源：

ASTROPHYSICAL JOURNAL | 2022年 / 933卷 / 02期

基金：

欧洲研究理事会;

关键词：

PAIR-INSTABILITY SUPERNOVAE; GLOBULAR-CLUSTER; TIDAL DISRUPTION; RATIO INSPIRALS; AGN DISCS; YOUNG; RUNAWAY; SIMULATIONS; SEGREGATION; EVOLUTION;

D O I：

10.3847/1538-4357/ac75d0

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Repeated mergers of stellar-mass black holes in dense star clusters can produce intermediate-mass black holes (IMBHs). In particular, nuclear star clusters at the centers of galaxies have deep enough potential wells to retain most of the black hole (BH) merger products, in spite of the significant recoil kicks due to anisotropic emission of gravitational radiation. These events can be detected in gravitational waves, which represent an unprecedented opportunity to reveal IMBHs. In this paper, we analyze the statistical results of a wide range of numerical simulations, which encompass different cluster metallicities, initial BH seed masses, and initial BH spins, and we compute the merger rate of IMBH binaries. We find that merger rates are in the range 0.01-10 Gpc(-3) yr(-1) depending on IMBH masses. We also compute the number of multiband detections in ground-based and space-based observatories. Our model predicts that a few merger events per year should be detectable with LISA, DECIGO, Einstein Telescope (ET), and LIGO for IMBHs with masses less than or similar to 1000 M (circle dot), and a few tens of merger events per year with DECIGO, ET, and LIGO only.

引用

页数：9

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