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Black hole binaries dynamically formed in globular clusters

Title
Black hole binaries dynamically formed in globular clusters
Authors
Park, DawooKim, ChungleeLee, Hyung MokBae, Yeong-BokBelczynski, Krzysztof
Ewha Authors
김정리
SCOPUS Author ID
김정리scopus
Issue Date
2017
Journal Title
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN
0035-8711JCR Link

1365-2966JCR Link
Citation
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY vol. 469, no. 4, pp. 4665 - 4674
Keywords
gravitational wavesmethods: numericalbinaries: closestars: black holesglobular clusters: general
Publisher
OXFORD UNIV PRESS
Indexed
SCIE; SCOPUS WOS
Document Type
Article
Abstract
We investigate properties of black hole (BH) binaries formed in globular clusters via dynamical processes, using direct N-body simulations. We pay attention to effects of BH mass function on the total mass and mass ratio distributions of BH binaries ejected from clusters. First, we consider BH populations with two different masses in order to learn basic differences from models with single-mass BHs only. Secondly, we consider continuous BH mass functions adapted from recent studies on massive star evolution in a low metallicity environment, where globular clusters are formed. In this work, we consider only binaries that are formed by three-body processes and ignore stellar evolution and primordial binaries for simplicity. Our results imply that most BH binary mergers take place after they get ejected from the cluster. Also, mass ratios of dynamically formed binaries should be close to 1 or likely to be less than 2:1. Since the binary formation efficiency is larger for higher-mass BHs, it is likely that a BH mass function sampled by gravitational-wave observations would be weighed towards higher masses than the mass function of single BHs for a dynamically formed population. Applying conservative assumptions regarding globular cluster populations such as small BH mass fraction and no primordial binaries, the merger rate of BH binaries originated from globular clusters is estimated to be at least 6.5 yr(-1) Gpc(-3). Actual rate can be up to more than several times of our conservative estimate.
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DOI
10.1093/mnras/stx1015
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자연과학대학 > 물리학전공 > Journal papers
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