par Abbott, R;Collette, Christophe 
;Ding, Binlei ;Watchi, Jennifer ;Zhao, Guoying ; [et al.]
Référence The astrophysical journal. Letters, 913, 1, L7
Publication Publié, 2021-05-20
;Ding, Binlei ;Watchi, Jennifer ;Zhao, Guoying ; [et al.]Référence The astrophysical journal. Letters, 913, 1, L7
Publication Publié, 2021-05-20
Article révisé par les pairs
| Résumé : | We report on the population of 47 compact binary mergers detected with a false-alarm rate of <1 yr-1 in the second LIGO-Virgo Gravitational-Wave Transient Catalog. We observe several characteristics of the merging binary black hole (BBH) population not discernible until now. First, the primary mass spectrum contains structure beyond a power law with a sharp high-mass cutoff; it is more consistent with a broken power law with a break at 39.7-+9.120.3 M? or a power law with a Gaussian feature peaking at 33.1-+5.64.0 M? (90% credible interval). While the primary mass distribution must extend to ~65 M? or beyond, only 2.9-+1.73.5% of systems have primary masses greater than 45 M?. Second, we find that a fraction of BBH systems have component spins misaligned with the orbital angular momentum, giving rise to precession of the orbital plane. Moreover,12%-44% of BBH systems have spins tilted by more than 90°, giving rise to a negative effective inspiral spin parameter, ceff. Under the assumption that such systems can only be formed by dynamical interactions, we infer that between 25% and 93% of BBHs with nonvanishing ceff |
