Gravitational waves from Population III binary black holes are consistent with LIGO/Virgo O3a data for the chirp mass larger than ∼20 M⊙

Abstract

ABSTRACT The probability number distribution function of binary black hole mergers observed by LIGO/Virgo O3a has double peaks as a function of chirp mass Mchirp, total mass Mtotal, primary black hole mass M1, and secondary one M2, respectively. The larger chirp mass peak is at Mchirp≅ 30 M⊙. The distribution of M2 versus M1 follows the relation of M2≅ 0.7M1. For initial mass functions of Population III stars in the form of f(M) ∝ M−α, population synthesis numerical simulations with 0 ≤ α ≤ 1.5 are consistent with O3a data for Mchirp ≳ 20 M⊙. The distribution of M2 versus M1 for simulation data also agrees with M2 ≅ 0.7M1 relation of O3a data.

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