Properties and astrophysical implications of the 150 Msun binary black hole merger GW190521
Creators: name: The LIGO Scientific Collaboration
name: The Virgo Collaboration
name: Abbott, R.
name: Abbott, T. D.
name: Abraham, S.
name: Acernese, F.
name: Ackley, K.
name: Adams, C.
name: Adhikari, R. X.
name: Adya, V. B.
name: Affeldt, C.
name: Agathos, M.
name: Agatsuma, K.
name: Aggarwal, N.
name: Aguiar, O. D.
name: Aich, A.
name: Aiello, L.
name: Ain, A.
name: Ajith, P.
name: Akcay, S.
name: Allen, G.
name: Allocca, A.
name: Altin, P. A.
name: Amato, A.
name: Anand, S.
name: Ananyeva, A.
name: Anderson, S. B.
name: Anderson, W. G.
name: Angelova, S. V.
name: Ansoldi, S.
name: Antier, S.
name: Appert, S.
name: Arai, K.
name: Araya, M. C.
name: Areeda, J. S.
name: Arène, M.
name: Arnaud, N.
name: Aronson, S. M.
name: Arun, K. G.
name: Asali, Y.
name: Ascenzi, S.
name: Ashton, G.
name: Aston, S. M.
name: Astone, P.
name: Aubin, F.
name: Aufmuth, P.
name: AultONeal, K.
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name: Avendano, V.
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name: Badaracco, F.
name: Bader, M. K. M.
name: Bae, S.
name: Baer, A. M.
name: Baird, J.
name: Baldaccini, F.
name: Ballardin, G.
name: Ballmer, S. W.
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name: Balsamo, A.
name: Baltus, G.
name: Banagiri, S.
name: Bankar, D.
name: Bankar, R. S.
name: Barayoga, J. C.
name: Barbieri, C.
name: Barish, B. C.
name: Barker, D.
name: Barkett, K.
name: Barneo, P.
name: Barone, F.
name: Barr, B.
name: Barsotti, L.
name: Barsuglia, M.
name: Barta, D.
name: Bartlett, J.
name: Bartos, I.
name: Bassiri, R.
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name: Bawaj, M.
name: Bayley, J. C.
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Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The gravitational-wave signal GW190521 is consistent with a binary black hole merger source at redshift 0.8 with unusually high component masses, $85^{+21}_{-14}\,M_{\odot}$ and $66^{+17}_{-18}\,M_{\odot}$, compared to previously reported events, and shows mild evidence for spin-induced orbital precession. The primary falls in the mass gap predicted by (pulsational) pair-instability supernova theory, in the approximate range $65 - 120\,M_{\odot}$. The probability that at least one of the black holes in GW190521 is in that range is 99.0%. The final mass of the merger $(142^{+28}_{-16}\,M_{\odot})$ classifies it as an intermediate-mass black hole. Under the assumption of a quasi-circular binary black hole coalescence, we detail the physical properties of GW190521's source binary and its post-merger remnant, including component masses and spin vectors. Three different waveform models, as well as direct comparison to numerical solutions of general relativity, yield consistent estimates of these properties. Tests of strong-field general relativity targeting the merger-ringdown stages of coalescence indicate consistency of the observed signal with theoretical predictions. We estimate the merger rate of similar systems to be $0.13^{+0.30}_{-0.11}\,{\rm Gpc}^{-3}\,\rm{yr}^{-1}$. We discuss the astrophysical implications of GW190521 for stellar collapse, and for the possible formation of black holes in the pair-instability mass gap through various channels: via (multiple) stellar coalescence, or via hierarchical merger of lower-mass black holes in star clusters or in active galactic nuclei. We find it to be unlikely that GW190521 is a strongly lensed signal of a lower-mass black hole binary merger. We also discuss more exotic possible sources for GW190521, including a highly eccentric black hole binary, or a primordial black hole binary.
description: 39 pages, 13 figures; data available at https://dcc.ligo.org/P2000158-v4/public