The Mass Density of Merging Binary Black Holes Over Cosmic Time
Aryanna Schiebelbein-Zwack, Maya Fishbach
arXiv:2403.17156v1 Announce Type: new
Abstract: The connection between the binary black hole (BBH) mergers observed by LIGO-Virgo-KAGRA (LVK) and their stellar progenitors remains uncertain. Specifically, the fraction $epsilon$ of stellar mass that ends up in BBH mergers and the delay time $tau$ between star formation and BBH merger carry information about the astrophysical processes that give rise to merging BBHs. We model the BBH merger rate in terms of the cosmic star formation history, coupled with a metallicity-dependent efficiency $epsilon$ and a distribution of delay times $tau$, and infer these parameters with data from the Third Gravitational-Wave Transient Catalog (GWTC-3). We find that the progenitors to merging BBHs preferentially form in low metallicity environments with a low metallicity efficiency of $log_{10}epsilon_{
Abstract: The connection between the binary black hole (BBH) mergers observed by LIGO-Virgo-KAGRA (LVK) and their stellar progenitors remains uncertain. Specifically, the fraction $epsilon$ of stellar mass that ends up in BBH mergers and the delay time $tau$ between star formation and BBH merger carry information about the astrophysical processes that give rise to merging BBHs. We model the BBH merger rate in terms of the cosmic star formation history, coupled with a metallicity-dependent efficiency $epsilon$ and a distribution of delay times $tau$, and infer these parameters with data from the Third Gravitational-Wave Transient Catalog (GWTC-3). We find that the progenitors to merging BBHs preferentially form in low metallicity environments with a low metallicity efficiency of $log_{10}epsilon_{
2024-03-27