http://arxiv.org/abs/1910.11358
Recently Venumadhav et al. \cite{IAS0} proposed a new pipeline to analyze LIGO-Virgo’s O1-O2 data and discovered eight new binary black hole (BBH) mergers, including a high effective spin, $\chi_{eff}$, one. This discovery sheds new light on the origin of the observed BBHs and the dynamical capture vs. field binaries debate. Using a new statistical approach, we show that, while isotropic models are not ruled out, the observed $\chi_{eff}$ distribution favors field binaries, whose $\chi_{eff}$ is determined by tidal forces and wind losses, over capture.
Z. Piran and T. Piran
Mon, 28 Oct 19
37/40
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