The host galaxies of double compact objects across cosmic time

Mattia Toffano, Michela Mapelli, Nicola Giacobbo, M. Celeste Artale, Giancarlo Ghirlanda

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

We explore the host galaxies of compact-object binaries (black hole–black hole binaries, BHBs; neutron star–black hole binaries, NSBHs; double–neutron stars; DNSs) across cosmic time, by means of population-synthesis simulations combined with the Illustris cosmological simulation. At high redshift (z 4), the host galaxies of BHBs, NSBHs, and DNSs are very similar and are predominantly low-mass galaxies (stellar mass M < 1011 M). If z 4, most compact objects form and merge in the same galaxy, with a short delay time. At low redshift (z ≤ 2), the host galaxy populations of DNSs differ significantly from the host galaxies of both BHBs and NSBHs. DNSs merging at low redshift tend to form and merge in the same galaxy, with relatively short delay time. The stellar mass of DNS hosts peaks around ∼1010–1011 M. In contrast, BHBs and NSBHs merging at low redshift tend to form in rather small galaxies at high redshift and then to merge in larger galaxies with long delay times. This difference between DNSs and black hole binaries is a consequence of their profoundly different metallicity dependence.

Original languageEnglish
Pages (from-to)4622-4631
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume489
Issue number4
DOIs
Publication statusPublished - 11 Nov 2019
Externally publishedYes

Keywords

  • Black hole physics
  • Gravitational waves
  • Methods: numerical
  • Stars: black holes
  • Stars: mass-loss
  • Stars: neutron

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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