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On the host galaxy properties of stellar binary black hole mergers

Published online by Cambridge University Press:  29 January 2019

Youjun Lu Open the ORCID record for Youjun Lu [Opens in a new window] ,
Liang Cao  and
Yuetong Zhao
Youjun Lu
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100012, China; [email protected] School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China
Liang Cao
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100012, China; School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China
Yuetong Zhao
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100012, China; School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China
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Abstract

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We report our investigations on the host galaxy properties of stellar binary black holes (SBBHs) by implementing simple recipes for SBBH formation and merger into cosmological galaxy formation model. If the time delay between SBBH formation and merger ranges from Gyr to the Hubble time, SBBH mergers at redshift z < 0.3 occur preferentially in big galaxies with stellar mass M* > 2 × 1010M⊙ and metallicities Z peaking around ~0.6Z⊙. However, the host galaxy stellar mass distribution of heavy SBBH mergers (with total black hole mass >50M⊙) is bimodal with one peak at ~109M⊙ and the other peak at ~2 × 1010M⊙. The contribution fraction from metal-poor host galaxies (Z < 0.2Z⊙) to heavy mergers is much larger than that to less heavy mergers. If SBBHs were formed in the early universe, their mergers detected at z < 0.3 occur preferentially in even more massive galaxies with M* > 3 × 1010M⊙ and in galaxies with metallicities mostly >0.2Z⊙ and peaking at Z ~ 0.6Z⊙.

Keywords

stars: black holesgravitational wavesblack hole physics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S338: Gravitational Wave Astrophysics: Early Results from Gravitational Wave Searches and Electromagnetic Counterparts , October 2017 , pp. 14 - 21
Copyright
Copyright © International Astronomical Union 2019 

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