BLACK HOLE MERGERS. “This first gravitational wave event, GW150914, appears to have been caused by the merger to two fairly massive (∼30 M⊙) black holes. Subsequent detections of a BBH mergers (GW151226 and GW170104) and a candidate BBH event (LVT151012) have allowed more robust estimates of the local BBH merger rate density and have confirmed the existence of black holes involved in these mergers with masses that range from 7.5 to 36 M⊙.” (BBH = binary black hole).
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