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New binary black hole mergers in the LIGO--Virgo O3a data by Olsen, Seth; Venumadhav, Tejaswi; Mushkin, Jonathan; Roulet, Javier; Zackay, Barak; Zaldarriaga, Matias is a scholarly article available to read on EtoBox.

What is New binary black hole mergers in the LIGO--Virgo O3a data about?

We report the detection of ten new binary black hole (BBH) mergers in the publicly released data from the the first half of the third observing run (O3a) of advanced LIGO and advanced Virgo. We identify candidates using an updated version of the IAS search pipeline and compile a catalog of signals that pass a significance threshold of astrophysical probability greater than 0.5 (following the GWTC-2.1 and 3-OGC catalogs). The updated IAS pipeline is sensitive to a larger region of parameter space, applies a template prior that accounts for different search volume as a function of intrinsic parameters, and uses an improved coherent detection statistic that optimally combines the data from the Hanford and Livingston detectors. Among the ten new events, we observe interesting astrophysical scenarios including sources with confidently large effective spin parameters in both the positive and negative directions, high-mass black holes that are difficult to form in stellar collapse models due to (pulsational) pair instability, and low-mass mergers that bridge the gap between neutron stars and the lightest observed black holes. We infer source parameters in the upper and lower black hole ma

Author

Olsen, Seth; Venumadhav, Tejaswi; Mushkin, Jonathan; Roulet, Javier; Zackay, Barak; Zaldarriaga, Matias

Published

2022

Language

EN