Abstract
On May 21, 2019 at 03:02:29 UTC Advanced LIGO and Advanced Virgo observed a
short duration gravitational-wave signal, GW190521, with a three-detector
network signal-to-noise ratio of 14.7, and an estimated false-alarm rate of 1
in 4900 yr using a search sensitive to generic transients. If GW190521 is from
a quasicircular binary inspiral, then the detected signal is consistent with
the merger of two black holes with masses of $85^+21_-14 M_ødot$ and
$66^+17_-18 M_ødot$ (90 % credible intervals). We infer that the primary
black hole mass lies within the gap produced by (pulsational) pair-instability
supernova processes, and has only a 0.32 % probability of being below $65
M_ødot$. We calculate the mass of the remnant to be $142^+28_-16
M_ødot$, which can be considered an intermediate mass black hole (IMBH). The
luminosity distance of the source is $5.3^+2.4_-2.6$ Gpc, corresponding to
a redshift of $0.82^+0.28_-0.34$. The inferred rate of mergers similar to
GW190521 is $0.13^+0.30_-0.11\,Gpc^-3\,yr^-1$.
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