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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Cosmic rates of black hole mergers and pair-instability supernovae from chemically homogeneous binary evolution
Monthly Notices of the Royal Astronomical Society, Volume 499, No. 4, Year 2020
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Description
During the first three observing runs of the Advanced gravitational-wave detector network, the LIGO/Virgo collaboration detected several black hole binary (BHBH) mergers. As the population of detected BHBH mergers grows, it will become possible to constrain different channels for their formation. Here we consider the chemically homogeneous evolution (CHE) channel in close binaries, by performing population synthesis simulations that combine realistic binary models with detailed cosmological calculations of the chemical and star-formation history of the Universe. This allows us to constrain population properties, as well as cosmological and aLIGO/aVirgo detection rates of BHBH mergers formed through this pathway. We predict a BHBH merger rate at redshift zero of 5.8 Gpc−3yr−1 through the CHE channel, to be compared with aLIGO/aVirgo’s measured rate of 53.2, and find that eventual merger systems have BH masses in the range 17−43 M below the pair-instability supernova (PISN) gap, and >124 M above the PISN gap. We investigate effects of momentum kicks during black hole formation, and calculate cosmological and magnitude limited PISN rates. We also study the effects of high-redshift deviations in the star formation rate. We find that momentum kicks tend to increase delay times of BHBH systems, and our magnitude limited PISN rate estimates indicate that current deep surveys should be able to detect such events. Lastly, we find that our cosmological merger rate estimates change by at most -8 per cent for mild deviations of the star formation rate in the early Universe, and by up to -40 per cent for extreme deviations. © 2020 The Author(s)
Authors & Co-Authors
Du Buisson, Lise
United Kingdom, Oxford
University of Oxford
Podsiadlowski, Philiṕp
United Kingdom, Oxford
University of Oxford
Germany, Bonn
Universität Bonn
Kobayashi, Chiaki
United Kingdom, Hatfield
University of Hertfordshire
Abdalla, Fillipe Batoni
United Kingdom, London
University College London
Mandel, Ilya
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Australia, Clayton
Monash University
Australia, Hawthorn
Arc Centre of Excellence for Gravitational Wave Discovery
United Kingdom, Birmingham
University of Birmingham
de Mink, Selma E.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Netherlands, Amsterdam
Universiteit Van Amsterdam
Moriya, Takashi J.
Australia, Clayton
Monash University
Japan, Minato
National Institutes of Natural Sciences
Langer, Norbert
Germany, Bonn
Universität Bonn
Statistics
Citations: 61
Authors: 8
Affiliations: 13
Identifiers
Doi:
10.1093/MNRAS/STAA3225
ISSN:
00358711
Study Design
Cross Sectional Study