Abstract
Abstract
Coalescing binary black hole (BBH) systems are likely formed via several channels, and it is challenging to understand their formation/evolutionary processes. Some features in the mass function of the primary components (m
1), such as the distinct Gaussian-like peak located at ∼34 M
⊙, have been previously found. In this work, we investigate the possible dependence of the mass ratio (q = m
2/m
1) distribution on the primary mass. We find a Bayesian odds ratio of 18.1 in favor of divergence in the mass ratio distributions between the low- and high-mass ranges over an invariable mass ratio distribution. BBHs with m
1 ≳ 29 M
⊙ have a stronger preference of being symmetric compared to those with m
1 ≲ 29 M
⊙ at a 97.6% credible level. Additionally, we find mild evidence that BBHs with m
1 located in the Gaussian-like peak have a mass ratio distribution different from that of other BBHs. Our findings may favor some formation channels, such as chemically homogeneous evolution and dynamical assembly in globular clusters/nuclear star clusters, which are more likely to provide symmetric BBHs in the high-mass range.
Funder
NSFC ∣ China National Funds for Distinguished Young Scientists
Chinese Academy of Sciences via the Strategic Priority Research Program
Key Research Program of Frontier Sciences
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
6 articles.
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