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Co-evolution of bulges and black holes

Published online by Cambridge University Press:  01 July 2007

Jong-Hak Woo ,
Tommaso Treu ,
Matthew A. Malkan  and
Roger D. Blandford
Jong-Hak Woo
Affiliation:
Department of Physics, University of California, Santa Barbara, CA 93106, USA email: woo@physics.ucsb.edu, tt@physics.ucsb.edu
Tommaso Treu
Affiliation:
Department of Physics, University of California, Santa Barbara, CA 93106, USA email: woo@physics.ucsb.edu, tt@physics.ucsb.edu
Matthew A. Malkan
Affiliation:
Department of Physics and Astronomy, University of California at Los Angeles, CA 90095-1547, USA email: malkan@astro.ucla.edu
Roger D. Blandford
Affiliation:
Kavli Institute for Particle Astrophysics and Cosmology, Stanford, CA 94305, USA email: rdb@slac.stanford.edu
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Abstract

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In the present-day universe, the global properties of bulges and early-type galaxies correlate with the mass of their central black holes, indicating a connection between galaxy evolution and nuclear activity. Understanding the origin of this relation is a major challenge for cosmological models. Using Keck spectra and HST images, we present direct measurements of the correlations between black hole mass and host spheroid luminosity and velocity dispersion at z=0.36, showing that the relations evolved significantly in the past 4 billion years. It appears that black holes of a few 108 M⊙ completed their growth before their host galaxies, and that the current scaling relations are only the final point of the co-evolution of galaxies and black holes.

Keywords

black hole physicsgalaxies: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S245: Formation and Evolution of Galaxy Bulges , July 2007 , pp. 223 - 226
Copyright
Copyright © International Astronomical Union 2008

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