Formation of mass gap compact object and black hole binary from Population III stars

Abstract

We performed population synthesis simulations of Population III binary stars with Maxwellian kick velocity distribution when MGCOs (mass gap compact objects, with mass 2-5M⊙) are formed. We found that for eight kick velocity dispersion models of σk = 0-500 km s-1, the mean mass of black hole (BH)-MGCO binary is ∼ (30M⊙, 2.6M⊙). In numerical data of our simulations, we found the existence of a BH-MGCO binary with mass (22.9M⊙, 2.5M⊙) which looks like GW190814.