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          Institute: MPI für Astrophysik     Collection: Cosmology     Display Documents



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ID: 12123.0, MPI für Astrophysik / Cosmology
Galaxy cores as relics of black hole mergers
Authors:Milosavljevic, M.; Merritt, D.; Rest, A.; van den Bosch, F. C.
Language:English
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:Mon. Not. Roy. Astron. Soc.
Volume:331
Issue / Number:4
Start Page:L51
End Page:L55
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We investigate the hypothesis that the cores of elliptical galaxies and bulges are created from the binding energy liberated by the coalescence of supermassive binary black holes during galaxy mergers. Assuming that the central density profiles of galaxies were initially steep power laws, rho similar to r(-2), we define the 'mass deficit' as the mass in stars that had to be removed from the nucleus in order to produce the observed core. We use non-parametric deprojection to compute the mass deficit in a sample of 35 early-type galaxies with high-resolution imaging data. We find that the mass deficit correlates well with the mass of the nuclear black hole, consistent with the predictions of merger models. We argue that cores in haloes of non-interacting dark matter particles should be comparable in size to those observed in the stars.
Free Keywords:black hole physics; galaxies : elliptical and lenticular; cD; galaxies : interactions; galaxies : nuclei
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
External Affiliations:Rutgers State Univ, Dept Phys & Astron, POB 849, Piscataway, NJ; 08854 USA; Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA; Univ Washington, Dept Astron, Seattle, WA 98195 USA; Max Planck Inst Astrophys, D-85741 Garching, Germany
Identifiers:ISI:000175270700003
ISSN:0035-8711
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