Some LIGO/Virgo BH-BH mergers may arise from black holes in merging ultra-dwarf galaxies at z>1 if merger timescales are 4-7 Gyr, as local rates are too low by an order of magnitude but high-z conditions could match the observed GW rate of 9.7-101 Gpc^-3 yr^-1.
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Gravitational Waves from Black Holes in Merging Ultra-Dwarf Galaxies
Some LIGO/Virgo BH-BH mergers may arise from black holes in merging ultra-dwarf galaxies at z>1 if merger timescales are 4-7 Gyr, as local rates are too low by an order of magnitude but high-z conditions could match the observed GW rate of 9.7-101 Gpc^-3 yr^-1.