In the fiducial model, nuclear star clusters dominate the hierarchical black hole merger rate with f_NSC = 0.87 (+0.10, -0.29), while AGN disks contribute up to 34% of those detectable by LIGO.
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The origin channels of hierarchical binary black hole mergers in the LIGO-Virgo-KAGRA O1, O2, and O3 runs
In the fiducial model, nuclear star clusters dominate the hierarchical black hole merger rate with f_NSC = 0.87 (+0.10, -0.29), while AGN disks contribute up to 34% of those detectable by LIGO.