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^−3 yr^−1.
GW190521: A Binary Black Hole Merger with a Total Mass of 150 M⊙
Bischi, M.;Brighenti, F.;Greco, G.;Guidi, G.;Martelli, F.;Montani, M.;Piergiovanni, F.;Vetrano, F.;Vicere', A.;
2020
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⊙ 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^−3 yr^−1.| File | Dimensione | Formato | |
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GW190521_Discovery_PhysRevLett.125.101102.pdf
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