Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/132607
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Type: | Journal article |
Title: | Population properties of compact objects from the second LIGO-Virgo gravitational-wave transient catalog |
Author: | Abbott, B.P. Abbott, R. Abbott, T.D. Abraham, S. Acernese, F. Ackley, K. Adams, C. Adhikari, R.X. Adya, V.B. Affeldt, C. Agathos, M. Agatsuma, K. Aggarwal, N. Aguiar, O.D. Aiello, L. Ain, A. Ajith, P. Allen, G. Allocca, A. Aloy, M.A. et al. |
Citation: | Letters of the Astrophysical Journal, 2021; 913(1):L7-1-L7-41 |
Publisher: | American Astronomical Society |
Issue Date: | 2021 |
ISSN: | 2041-8205 2041-8213 |
Statement of Responsibility: | R. Abbott … David Ottaway … Alexei Ciobanu … Peter Veitch … Craig Ingram … Daniel Brown … et al. |
Abstract: | We report on the population of 47 compact binary mergers detected with a false-alarm rate of < - 1 yr 1 in the second LIGO–Virgo Gravitational-Wave Transient Catalog. We observe several characteristics of the merging binary black hole (BBH) population not discernible until now. First, the primary mass spectrum contains structure beyond a power law with a sharp high-mass cutoff; it is more consistent with a broken power law with a break at - 39.7+ 9.1 20.3 M or a power law with a Gaussian feature peaking at - 33.1+ 5.6 4.0 M (90% credible interval). While the primary mass distribution must extend to ~65 M or beyond, only - + 2.9 %1.7 3.5 of systems have primary 6 The Astrophysical Journal Letters, 913:L7 (41pp), 2021 May 20 Abbott et al. masses greater than 45 M. Second, we find that a fraction of BBH systems have component spins misaligned with the orbital angular momentum, giving rise to precession of the orbital plane. Moreover, 12%–44% of BBH systems have spins tilted by more than 90°, giving rise to a negative effective inspiral spin parameter, ceff. Under the assumption that such systems can only be formed by dynamical interactions, we infer that between 25% and 93% of BBHs with nonvanishing ∣c ∣ > 0.01 eff are dynamically assembled. Third, we estimate merger rates, finding = - + - - BBH 23.9 Gpc yr 8.6 14.3 3 1 for BBHs and = - + - - BNS 320 Gpc yr 240 490 3 1 for binary neutron stars. We find that the BBH rate likely increases with redshift (85% credibility) but not faster than the star formation rate (86% credibility). Additionally, we examine recent exceptional events in the context of our population models, finding that the asymmetric masses of GW190412 and the high component masses of GW190521 are consistent with our models, but the low secondary mass of GW190814 makes it an outlier. |
Rights: | © 2021 The Author(s). Published by The American Astronomical Society. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
DOI: | 10.3847/2041-8213/abe949 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.3847/2041-8213/abe949 |
Appears in Collections: | IPAS publications |
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hdl_132607.pdf | Published version | 4.11 MB | Adobe PDF | View/Open |
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