Binary black hole mergers from globular clusters: The impact of globular cluster properties

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Binary black hole mergers from globular clusters : The impact of globular cluster properties. / Hong, Jongsuk; Vesperini, Enrico; Askar, Abbas; Giersz, Mirek; Szkudlarek, Magdalena; Bulik, Tomasz.

I: Monthly Notices of the Royal Astronomical Society, Vol. 480, Nr. 4, 2018, s. 5645-5656.

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Hong, Jongsuk ; Vesperini, Enrico ; Askar, Abbas ; Giersz, Mirek ; Szkudlarek, Magdalena ; Bulik, Tomasz. / Binary black hole mergers from globular clusters : The impact of globular cluster properties. I: Monthly Notices of the Royal Astronomical Society. 2018 ; Vol. 480, Nr. 4. s. 5645-5656.

RIS

TY - JOUR

T1 - Binary black hole mergers from globular clusters

T2 - Monthly Notices of the Royal Astronomical Society

AU - Hong, Jongsuk

AU - Vesperini, Enrico

AU - Askar, Abbas

AU - Giersz, Mirek

AU - Szkudlarek, Magdalena

AU - Bulik, Tomasz

PY - 2018

Y1 - 2018

N2 - The dense environment of globular clusters (GCs) can facilitate the formation of binary black holes (BBHs), some of which can merge with gravitational waves within the age of the Universe. We have performed a survey of Monte Carlo simulations following the dynamical evolution of GCs with different masses, sizes, and binary fractions and explored the impact of the host GC properties on the formation of BBH mergers. We find that the number of BBH mergers from GCs is determined by the GC's initial mass, size, and primordial binary fraction. We identify two groups of BBH mergers: a primordial group whose formation does not depend on cluster's dynamics, and a dynamical group whose formation is driven by the cluster's dynamical evolution. We show how the BBH origin affects the BBH mergers' main properties such as the chirp mass and merging time distributions. We provide analytic expressions for the dependence of the number of BBH mergers from individual GCs on the main cluster's structural properties and the time evolution of the merger rates of these BBHs. These expressions provide an essential ingredient for a general framework allowing to estimate the merger rate density. Using the relations found in our study, we find a local merger rate density of 0.18-1.8 Gpc-3 yr-1 for primordial BBH mergers and 0.6-18 Gpc-3 yr-1 for dynamical BBH mergers, depending on the GC mass and size distributions, initial binary fraction, and the number density of GCs in the Universe.

AB - The dense environment of globular clusters (GCs) can facilitate the formation of binary black holes (BBHs), some of which can merge with gravitational waves within the age of the Universe. We have performed a survey of Monte Carlo simulations following the dynamical evolution of GCs with different masses, sizes, and binary fractions and explored the impact of the host GC properties on the formation of BBH mergers. We find that the number of BBH mergers from GCs is determined by the GC's initial mass, size, and primordial binary fraction. We identify two groups of BBH mergers: a primordial group whose formation does not depend on cluster's dynamics, and a dynamical group whose formation is driven by the cluster's dynamical evolution. We show how the BBH origin affects the BBH mergers' main properties such as the chirp mass and merging time distributions. We provide analytic expressions for the dependence of the number of BBH mergers from individual GCs on the main cluster's structural properties and the time evolution of the merger rates of these BBHs. These expressions provide an essential ingredient for a general framework allowing to estimate the merger rate density. Using the relations found in our study, we find a local merger rate density of 0.18-1.8 Gpc-3 yr-1 for primordial BBH mergers and 0.6-18 Gpc-3 yr-1 for dynamical BBH mergers, depending on the GC mass and size distributions, initial binary fraction, and the number density of GCs in the Universe.

KW - Globular clusters: general

KW - Gravitational waves

KW - Stars: black holes

U2 - 10.1093/mnras/sty2211

DO - 10.1093/mnras/sty2211

M3 - Article

VL - 480

SP - 5645

EP - 5656

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 1365-2966

IS - 4

ER -