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The Slow Growth of Massive Galaxies in Rapidly Growing Dark Matter Halos

Published online by Cambridge University Press:  13 April 2010

Michael J. I. Brown
Michael J. I. Brown
Affiliation:
School of Physics, Monash University, Clayton, Victoria 3800, Australia email: Michael.Brown@sci.monash.edu.au
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Abstract

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In cold dark matter cosmologies, the most massive dark matter halos are predicted to undergo rapid growth at z < 1. While there is the expectation that massive galaxies will also rapidly grow via merging, recent observational studies conclude that the stellar masses of the most massive galaxies grow by just ~ 30% at z < 1. We have used the observed space density and clustering of z < 1 red galaxies in Boötes to determine how these galaxies populate dark matter halos. In the most massive dark matter halos, central galaxy stellar mass is proportional to halo mass to the power of a ~1/3 and much of the stellar mass resides within satellite galaxies. As a consequence, the most massive galaxies grow slowly even though they reside within rapidly growing dark matter halos.

Keywords

galaxies: elliptical and lenticularcDgalaxies: evolution(cosmology:) dark matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S262: Stellar Populations – Planning for the Next Decade , August 2009 , pp. 244 - 247
Copyright
Copyright © International Astronomical Union 2010

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