Black hole mergers from globular clusters observable by LISA II. Resolved eccentric sources and the gravitational wave background

被引：72
作者：
D'Orazio, Daniel J. [1 ]
Samsing, Johan [2 ]
机构：
[1] Harvard Univ, Dept Astron, 60 Garden St, Cambridge, MA 01238 USA
[2] Princeton Univ, Dept Astrophys Sci, Peyton Hall,4 Ivy Lane, Princeton, NJ 08544 USA
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 481卷 / 04期
关键词：
gravitational waves; galaxies: star clusters: general; BINARY-SYSTEMS; RADIATION; DRIVEN; SIGNAL; SPIN;
D O I：
10.1093/mnras/sty2568
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
In Paper I of this series we showed that a large per centage of the binary black hole (BBH) mergers that form through dynamical interactions in globular clusters will have significant eccentricity in the similar to 10(-3) to 10(-1) Hz LISA band. In this work we quantify the evolution of these highly eccentric binaries through the LISA and LIGO bands, and compute the stochastic gravitational wave background from the merging, eccentric population. We find that the population of BBHs that merge in-between three-body encounters inside their cluster (similar to 50 per cent of all cluster-formed BBH mergers) will have measurable eccentricity for their entire lifetime in the LISA band. The population of BBHs that merge during three-body encounters (similar to 5 per cent of all cluster-formed BBH mergers) will be detectable by LIGO with eccentricities of e similar to 0.1. The gravitational wave background from dynamically assembled BBHs encodes a characteristic bump due to the high initial eccentricities of these systems. The location and amplitude of this bump depend on globular cluster properties.
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收藏
页码：4775 / 4785
页数：11
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