Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/68153

Title

Red galaxy growth and the halo occupation distribution

Author(s)

Brown, Michael J. I.;  Zheng, Zheng;  White, Martin;  Dey, Arjun;  Jannuzi, Buell T.;  Benson, Andrew J.;  Brand, Kate;  Brodwin, Mark;  Croton, Darren J.

Abstract

We have traced the past 7 Gyr of red galaxy stellar mass growth within dark matter halos. We have determined the halo occupation distribution, which describes how galaxies reside within dark matter halos, using the observed luminosity function and clustering of 40,696 0.2 ‹z‹1.0 red galaxies in Bootes. Half of ≅1011.9 h-1 Mo halos host a red central galaxy, and this fraction increases with increasing halo mass. We do not observe any evolution of the relationship between red galaxy stellar mass and host halo mass, although we expect both galaxy stellar masses and halo masses to evolve over cosmic time. We find that the stellar mass contained within the red population has doubled since z=l, with the stellar mass within red satellite galaxies tripling over this redshift range. In cluster mass halos (>1014 h-1 Mo) most of the stellar mass resides within satellite galaxies and the intracluster light, with a minority of the stellar mass residing within central galaxies. The stellar masses of the most luminous red central galaxies are proportional to halo mass to the power of ≅0.35. We thus conclude that halo mergers do not always lead to rapid growth of central galaxies. While very massive halos often double in mass over the past 7 Gyr, the stellar masses of their central galaxies typically grow by only ≅30%.

Publication type

Journal article

Source

Astrophysical Journal, Vol. 682, no. 2 (Aug 2008), pp. 937-963

Publication year

2008

FOR Code(s)

0201 Astronomical and Space Sciences

Keyword(s)

Eliptical galaxies;  Galaxies;  Galaxy evolution;  Large-scale structure of universe;  Lenticular galaxies;  Luminosity function;  Mass function

Publisher

University of Chicago Press

ISSN

0004-637X

Publisher URL

http://dx.doi.org/10.1086/589538

Copyright

Copyright © 2008 The American Astronomical Society. All rights reserved. The American Astronomical Society does not allow institutions to archive either the accepted manuscript or the published version of the article. However, you can find the author's version of the article here: http://arxiv.org/abs/0804.2293.

Peer reviewed