A Detailed Analysis of GW190521 with Phenomenological Waveform Models

In this paper we present an extensive analysis of the GW190521 gravitational wave event with current (fourth) generation phenomenological waveform models for binary black hole coalescences. stands out from other events since only a few cycles are observable. This leads to number challenges, one being that such short signals prone not resolve approximate degeneracies, which may result in multi-modal posterior distributions. The family use includes new fast time-domain model IMRPhenomTPHM, allows us tests different priors and robustness respect variations model, including content spherical harmonic modes. We clarify some issues raised recent [Nitz&Capano], associated possible support high-mass ratio source, but confirm their finding distribution, albeit important differences statistical significance peaks. particular, find both masses outside PISN mass-gap, intermediate mass drastically reduced what Nitz&Capano found. also provide updated probabilities associating potential electromagnetic counterpart ZTF.