High rate of gravitational waves mergers from flyby perturbations of wide black hole triples in the field

被引：44

作者：

Michaely, Erez ^{[1
]}

Perets, Hagai B. ^{[2
]}

机构：

[1] Univ Maryland, Astron Dept, College Pk, MD 20742 USA

[2] Technion Israel Inst Technol, Phys Dept, IL-3200002 Haifa, Israel

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2020年 / 498卷 / 04期

关键词：

gravitational waves; stars: black holes; stars: kinematics and dynamics; X-RAY BINARIES; STELLAR CLUSTERS; COMPACT OBJECTS; MASS; EVOLUTION; STARS; GALAXIES;

D O I：

10.1093/mnras/staa2720

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Ultrawide triple black holes (TBHs; with an outer orbit > 10(3) au) in the field can be considerably perturbed by flyby encounters with field stars through the excitation of their outer orbit eccentricities. We study the cumulative effect of such flybys, and show them to be conductive for the production of gravitational-wave (GW) sources. Flyby encounters with TBHs can destabilize them, leading to binary-single resonant encounters between the outer black hole (BH) and the inner binary. These encounters can result in either a prompt GW merger of two of the TBH components during the resonant phase, or the disruption of the TBH. In the latter case, a more compact binary is left behind, while the third BH is ejected. Such compact remnant binaries may still inspiral through GW emission, producing delayed GW mergers, with a significant fraction of these merging in less than a Hubble time. We find a volumetric merger rate of similar to 3-10 Gpc(-3) yr(-1) contributed by the (former) prompt-merger TBH channel and similar to 100-250 Gpc(-3) yr(-1) contributed by the (latter) delayed-merger TBH channel. The prompt channel gives rise to eccentric mergers in the aLIGO band, while the majority of the delayed GW mergers are circularized when enter the aLIGO band. We find the total eccentric volumetric merger rate to be similar to 1-10 Gpc(-3) yr(-1) from both channels. We expect these mergers to show no significant spin-orbit alignment, and uniform delay-time distribution.

引用

页码：4924 / 4935

页数：12

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