---
res:
  bibo_abstract:
  - The astrophysical origin of gravitational wave (GW) events is one of the most
    timely problems in the wake of the LIGO/Virgo discoveries. In active galactic
    nuclei (AGN), binaries form and evolve efficiently by dynamical interactions and
    gaseous dissipation. Previous studies have suggested that binary black hole (BBH)
    mergers in AGN disks can contribute significantly to BBH mergers observed by GW
    interferometers. Here we examine the distribution of the effective spin parameter
    χeff of this GW source population. We extend our semi-analytical model of binary
    formation and evolution in AGN disks by following the evolution of the binary
    orbital angular momenta and black hole (BH) spins. BH spins change due to gas
    accretion and BH mergers, while the binary orbital angular momenta evolve due
    to gas accretion and binary-single interactions. We find that the distribution
    of χeff predicted by our AGN model is similar to the distribution observed during
    LIGO/Virgo O1 and O2. On the other hand, if radial migration of BHs is inefficient,
    χeff is skewed toward higher values compared with the observed distribution, because
    of the paucity of scattering events that would randomize spin directions relative
    to the orbital plane. We suggest that high binary masses and the positive correlation
    between binary mass and the standard deviation of χeff for chirp masses up to
    ≈20 M⊙, can be possible signatures for mergers originating in AGN disks. Finally,
    hierarchical mergers in AGN disks naturally produce properties of the recent GW
    event GW190412, including a low mass ratio, a high primary BH spin, and a significant
    spin component in the orbital plane.@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Hiromichi
      foaf_name: Tagawa, Hiromichi
      foaf_surname: Tagawa
  - foaf_Person:
      foaf_givenName: Zoltán
      foaf_name: Haiman, Zoltán
      foaf_surname: Haiman
      foaf_workInfoHomepage: http://www.librecat.org/personId=7c006e8c-cc0d-11ee-8322-cb904ef76f36
  - foaf_Person:
      foaf_givenName: Imre
      foaf_name: Bartos, Imre
      foaf_surname: Bartos
  - foaf_Person:
      foaf_givenName: Bence
      foaf_name: Kocsis, Bence
      foaf_surname: Kocsis
  bibo_doi: 10.3847/1538-4357/aba2cc
  bibo_issue: '1'
  bibo_volume: 899
  dct_date: 2020^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/0004-637X
  - http://id.crossref.org/issn/1538-4357
  dct_language: eng
  dct_publisher: American Astronomical Society@
  dct_title: Spin evolution of stellar-mass black hole binaries in active galactic
    nuclei@
...