Constraining hierarchical mergers of binary black holes detectable with LIGO-Virgo

TL;DR

This paper presents a simple formula to estimate the rate of hierarchical binary black hole mergers in star clusters, finding similar overall rates in globular and nuclear star clusters despite different hierarchical merger fractions.

Contribution

The authors introduce a straightforward formula to estimate hierarchical merger rates, highlighting the comparable overall rates in different star cluster environments.

Findings

Hierarchical merger rate is proportional to retention probability.

Approximately 2% of BBH mergers in NSCs are hierarchical.

Overall hierarchical merger rates are about 10^{-2} Gpc^{-3} yr^{-1} in both GCs and NSCs.

Abstract

Most of the binary black hole (BBH) mergers detected by LIGO and Virgo could be explained by first-generation mergers formed from the collapse of stars, while others might come from second (or higher) generation mergers, namely hierarchical mergers, with at least one of the black holes (BHs) being the remnant of a previous merger. A primary condition for the occurrence of hierarchical mergers is that the remnant BHs can be retained by the host star cluster. We present a simple formula to estimate the hierarchical merger rate in star clusters. We find this latter to be proportional to the retention probability. Further, we show that $\sim 2\%$ of BBH mergers in nuclear star clusters (NSCs) may instead be of hierarchical mergers, while the percentage in globular clusters (GCs) is only a few tenths of a percent. However, the rates of hierarchical merger in GCs and NSCs are about the same, namely of $\sim {\mathcal O(10^{-2})}~{\rm Gpc^{-3}~yr^{-1}}$, because the total BBH merger rate in GCs is larger than that in NSCs. This suggests that if a gravitational-wave event detected by LIGO-Virgo is identified as a hierarchical merger, then it is equally likely that this merger originated from a GC or an NSC.