Publication
Title
GWTC-2.1 : deep extended catalog of compact binary coalescences observed by LIGO and Virgo during the first half of the third observing run
Author
Institution/Organisation
LIGO Scientific Collaboration
Virgo Collaboration
Abstract
The second Gravitational-Wave Transient Catalog, GWTC-2, reported on 39 compact binary coalescences observed by the Advanced LIGO and Advanced Virgo detectors between 1 April 2019 1500 UTC and 1 October 2019 1500 UTC. Here, we present GWTC-2.1, which reports on a deeper list of candidate events observed over the same period. We analyze the final version of the strain data over this period with improved calibration and better subtraction of excess noise, which has been publicly released. We employ three matched-filter search pipelines for candidate identification, and estimate the probability of astrophysical origin for each candidate event. While GWTC-2 used a false alarm rate threshold of 2 per year, we include in GWTC-2.1, 1201 candidates that pass a false alarm rate threshold of 2 per day. We calculate the source properties of a subset of 44 high-significance candidates that have a probability of astrophysical origin greater than 0.5. Of these candidates, 36 have been reported in GWTC-2. We also calculate updated source properties for all binary black hole events previously reported in GWTC-1. If the eight additional high-significance candidates presented here are astrophysical, the mass range of events that are unambiguously identified as binary black holes (both objects >= 3M(circle dot)) is increased compared to GWTC-2, with total masses from similar to 14M(circle dot) for GW190924_021846 to similar to 182M(circle dot) for GW190426_190642. Source properties calculated using our default prior suggest that the primary components of two new candidate events (GW190403_051519 and GW190426_190642) fall in the mass gap predicted by pair-instability supernova theory. We also expand the population of binaries with significantly asymmetric mass ratios reported in GWTC-2 by an additional two events (the mass ratio is less than 0.65 and 0.44 at 90% probability for GW190403_051519 and GW190917_114630 respectively), and find that two of the eight new events have effective inspiral spins chi(eff)>0 (at 90% credibility), while no binary is consistent with chi(eff)<0 at the same significance. We provide updated estimates for rates of binary black hole and binary neutron star coalescence in the local Universe.
Language
English
Source (journal)
Physical review D / American Physical Society. - Ridge, N.Y., 2016, currens
Publication
Ridge, N.Y. : American Physical Society , 2024
ISSN
2470-0029
DOI
10.1103/PHYSREVD.109.022001
Volume/pages
109 :2 (2024) , p. 1-45
Article Reference
022001
ISI
001183197300011
Full text (Publisher's DOI)
Full text (open access)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identifier
Creation 29.03.2024
Last edited 12.11.2024
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