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Physical Review D
Pair instabilities in supernovae might prevent the formation of black holes with masses between ∼ 50 M_ and ∼ 130 M_. Multiple generations of black-hole mergers provide a possible way to populate this "mass gap" from below. However this requires an astrophysical environment with a sufficiently large escape speed to retain merger remnants, and prevent them from being ejected by gravitational-wave recoils. We show that, if the mass gap is indeed populated by multiple mergers, the observation of adoi:10.1103/physrevd.100.041301 fatcat:ea46kgd7trhr3imx5sxau3p7au