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+21−14M⊙ and 66+17−18M⊙ (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 65M⊙. We calculate the mass of the remnant to be 142+28−16M⊙, 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+0.30−0.11Gpc−3yr−1.
|Number of pages||17|
|Journal||Physical Review Letters|
|Early online date||2 Sep 2020|
|Publication status||Published - 4 Sep 2020|
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Cabourn Davies, G. (Creator), Edy, O. (Creator), Harry, I. (Creator), Keitel, D. (Creator), Lundgren, A. (Creator), Macas, R. (Creator), Mcisaac, C. (Creator), Mozzon, S. (Creator) & Nuttall, L. (Creator), American Physical Society, 2 Sep 2020