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GW190521 as a black-hole merger coincident with the ZTF19abanrhr flare

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arxiv 2112.12481 v1 pith:CU2ESKM4 submitted 2021-12-23 gr-qc astro-ph.HE

GW190521 as a black-hole merger coincident with the ZTF19abanrhr flare

Juan Calder\'on Bustillo , Samson H.W. Leong , Koustav Chandra , Barry McKernan , K. E. S. Ford This is my paper
classification gr-qc astro-ph.HE
keywords black-holegw190521ztf19abanrhradvancedcrediblefindflaremasses
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present an analysis that reconciles the gravitational-wave signal GW190521 observed by the Advanced LIGO and Advanced Virgo detectors with the electromagnetic flare ZTF19abanrhr observed by the Zwicky Transient Facility. We analyze GW190521 under a mass-ratio prior uniform in $Q \in [1,4]$ and using the state-of-the-art waveform model for black-hole mergers \texttt{NRSur7dq4}. We find a $90\%$ credible region for the black-hole masses extending far outside what originally reported by \cite{GW190521D}, where our maximum likelihood masses reside. We find a $15\%$ probability that both black holes avoid the pair-instability supernova gap. We infer a three-dimensional sky-location highly consistent with ZTF19abanrhr, obtaining an odds-ratio ${\cal{O}}_{C/R}=72:1$ that strongly favors the hypothesis of a true coincidence over a random one. Combining this event with the neutron-star merger GW170817, we estimate a Hubble constant H$_0=72.1^{+10.6}_{-6.4}\mathrm{km\,s^{-1}\,Mpc^{-1}}$ at the $68\%$ credible level.

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