http://arxiv.org/abs/2208.11871
The origins of the coalescing binary black holes (BBHs) detected by the advanced LIGO/Virgo are still under debate, and clues may present in the joint mass-spin distribution of these merger events. Here we construct phenomenological models to investigate the BBH population detected in gravitational observations. The data can be well explained by the members originated from two different channels: one is the evolution of field binaries, and the other is the dynamical assembly. We obtain a tight constraint on the maximum mass for events of the stellar-origin, which is $m_{\rm max}=39.4^{+2.6}{-2.5}M{\odot}$ at 90\% credibility. This mass cutoff likely arises from the (pulsational) pair-instability supernova explosion and/or stellar winds. We also find that a fraction of $4-17\%$ of dynamical events were hierarchical mergers, and these BHs had an average spin magnitude significantly larger than the first-generation mergers, with ${\rm d}\mu_{\rm a} > 0.4 $ at $99\%$ credibility.
Y. Wang, Y. Li, J. Vink, et. al.
Fri, 26 Aug 22
36/49
Comments: 16 pages, 8 figures