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Observing an intermediate mass black hole GW190521 with minimal assumptions

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arxiv 2009.11336 v1 pith:S5QXE2UV submitted 2020-09-23 astro-ph.HE

Marek Szczepanczyk , Sergey Klimenko , Brendan O'Brien , Imre Bartos , V. Gayathri , Guenakh Mitselmakher , Giovanni Prodi , Gabriele Vedovato
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Claudia Lazzaro Edoardo Milotti Francesco Salemi Marco Drago Shubhanshu Tiwari
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keywords gw190521blackbinaryadvancedassumptionsholeholesmass
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abstract

On May 21, 2019 Advanced LIGO and Advanced Virgo detectors observed a gravitational-wave transient GW190521, the heaviest binary black-hole merger detected to date with the remnant mass of 142$\,$M$_\odot$ that was published recently. This observation is the first strong evidence for the existence of intermediate-mass black holes. The significance of this observation was determined by the coherent WaveBurst (cWB) - search algorithm, which identified GW190521 with minimal assumptions on its source model. In this paper, we demonstrate the capabilities of cWB to detect binary black holes without use of the signal templates, describe the details of the GW190521 detection and establish the consistency of the model-agnostic reconstruction of GW190521 by cWB with the theoretical waveform model of a binary black hole.

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  1. Inferring additional physics through unmodelled signal reconstructions

    gr-qc 2024-12 conditional novelty 5.0 of 10

    A cWB overlap mismatch metric, Δmedian, separates simulated 40 solar mass black hole mergers with e20 ≳ 0.17 from circular ones even when parameter estimation uses only quasicircular waveforms.

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