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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⊙ and 66⁺¹⁷₋₁₈ M⊙ (90% credible intervals). We infer that the primary black hole mass lies within the gap produced by (pulsational) pair-instability supernova processes, with only a 0.32% probability of being below 65 M⊙. We calculate the mass of the remnant to be 142⁺²⁸₋₁₆ M⊙, 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⁻³yr⁻¹.

Item Type:	Refereed Article
Research Division:	Physical Sciences
Research Group:	Astronomical sciences
Research Field:	General relativity and gravitational waves
Objective Division:	Expanding Knowledge
Objective Group:	Expanding knowledge
Objective Field:	Expanding knowledge in the physical sciences
UTAS Author:	Siellez, K (Dr Karelle Siellez)
ID Code:	150291
Year Published:	2020
Web of Science® Times Cited:	574
Deposited By:	Physics
Deposited On:	2022-06-07
Last Modified:	2022-08-15
Downloads:	7 View Download Statistics