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Massive Black Holes in Merging Galaxies

Published online by Cambridge University Press:  27 October 2016

Marta Volonteri ,
Tamara Bogdanović ,
Massimo Dotti  and
Monica Colpi
Marta Volonteri
Affiliation:
Institut d'Astrophysique de Paris, Sorbonne Universitès, UPMC Univ Paris 6 et CNRS, UMR 7095, 98 bis bd Arago, 75014 Paris, France email: martav@iap.fr
Tamara Bogdanović
Affiliation:
Center for Relativistic Astrophysics, School of Physics, Georgia Tech 837 State Street, Atlanta, GA 30332-0430, USA email: tamarab@gatech.edu
Massimo Dotti
Affiliation:
Department of Physics & INFN, University of Milano Bicocca, Piazza della Scienza 3, I20126 Milano, Italy email: massimo.dotti@mib.infn.it, monica.colpi@mib.infn.it
Monica Colpi
Affiliation:
Department of Physics & INFN, University of Milano Bicocca, Piazza della Scienza 3, I20126 Milano, Italy email: massimo.dotti@mib.infn.it, monica.colpi@mib.infn.it
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Abstract

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The dynamics of massive black holes (BHs) in galaxy mergers is a rich field of research that has seen much progress in recent years. In this contribution we briefly review the processes describing the journey of BHs during mergers, from the cosmic context all the way to when BHs coalesce. If two galaxies each hosting a central BH merge, the BHs would be dragged towards the center of the newly formed galaxy. If/when the holes get sufficiently close, they coalesce via the emission of gravitational waves. How often two BHs are involved in galaxy mergers depends crucially on how many galaxies host BHs and on the galaxy merger history. It is therefore necessary to start with full cosmological models including BH physics and a careful dynamical treatment. After galaxies have merged, however, the BHs still have a long journey until they touch and coalesce. Their dynamical evolution is radically different in gas-rich and gas-poor galaxies, leading to a sort of “dichotomy” between high-redshift and low-redshift galaxies, and late-type and early-type, typically more massive galaxies.

Keywords

galaxies: kinematics and dynamicsgalaxies: nucleiblack hole physics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29B: Astronomy in Focus , August 2015 , pp. 285 - 291
Copyright
Copyright © International Astronomical Union 2016 

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