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Title:
Black Hole Spin and Galactic Morphology
Authors:
Volonteri, Marta; Sikora, Marek; Lasota, Jean-Pierre
Affiliation:
AA(Department of Astronomy, University of Michigan, Ann Arbor, MI), AB(Nicolaus Copernicus Astronomical Center, Bartycka 18, 00-716 Warszawa, Poland.; Department of Physics and Astronomy, University of Kentucky, Lexington, KY.), AC(Institut d'Astrophysique de Paris, UMR 7095 CNRS, Université Pierre et Marie Curie, 98bis Bd Arago, 75014 Paris, France.; Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Kraków, Poland.)
Publication:
The Astrophysical Journal, Volume 667, Issue 2, pp. 704-713. (ApJ Homepage)
Publication Date:
10/2007
Origin:
UCP
ApJ Keywords:
Black Hole Physics, Cosmology: Theory, Galaxies: Evolution, Galaxies: Quasars: General
DOI:
10.1086/521186
Bibliographic Code:
2007ApJ...667..704V

Abstract

We investigate the conjecture by Sikora, Stawarz, and Lasota that the observed active galactic nuclei (AGNs) radio loudness bimodality can be explained by the morphology-related bimodality of black hole spin distribution in the centers of galaxies: central black holes (BHs) in giant elliptical galaxies may have (on average) much larger spins than black holes in spiral/disk galaxies. We study how accretion from a warped disk influences the evolution of black hole spins and conclude that within the cosmological framework, where the most massive BHs have grown in mass via merger-driven accretion, one indeed expects most supermassive black holes in elliptical galaxies to have on average higher spin than black holes in spiral galaxies, where random, small accretion episodes (e.g., tidally disrupted stars, accretion of molecular clouds) might have played a more important role.
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