2022/02/11 by Broadhurst, T., Diego, J. M., Smoot, G. F. · 2 citations
#Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Astrophysical Phenomena (astro-ph.HE)
paper · doi:10.48550/arxiv.2202.05861
Although most gravitational wave events are claimed to be mergers of unusually massive, 25-65M_\odot, black holes, it is now clear that 20% of all reported events comprise modest mass black holes, 5-15M_\odot, like the stellar black holes in the Milky Way. We show that such stellar mass black hole binaries (BBH) if magnified by lensing galaxies can be detected at high redshift, 1< z 1. Furthermore, nearly all BBH events are seen to share a component mass ratio of m1/m2=1.45±0.03, indicating a common stellar origin for BBH events across all chirp masses. This observed component mass uniformity implies most binary black holes seldom pair up by random capture, instead we may conclude that massive progenitor stars of BBH black holes typically formed in-situ, in a well defined way over the full span of cosmic time accessed through gravitational lensing.