Journal Article

The history of mass assembly of faint red galaxies in 28 galaxy clusters since <b><i>z</i>= 1.3</b>

S. Andreon

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 386, issue 2, pages 1045-1052
Published in print May 2008 | ISSN: 0035-8711
Published online April 2008 | e-ISSN: 1365-2966 | DOI:
The history of mass assembly of faint red galaxies in 28 galaxy clusters since z= 1.3

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We measure the relative evolution of the number of bright and faint (as faint as 0.05L*) red galaxies in a sample of 28 clusters, out of which 16 are at 0.50 ≤z≤ 1.27, all observed through a pair of filters bracketing the 4000-Å break rest frame. The abundance of red galaxies, relative to bright ones, is constant over all the studied redshift range, 0 < z < 1.3, and rules out a differential evolution between bright and faint red galaxies as large as claimed in some past works. Faint red galaxies are largely assembled and in place at z= 1.3 and their abundance does not depend on cluster mass, parametrized by velocity dispersion or X-ray luminosity. Our analysis, with respect to the previous one, samples a wider redshift range, minimizes systematics and put a more attention to statistical issues, keeping at the same time a large number of clusters.

Keywords: galaxies: clusters: general; galaxies: evolution; galaxies: formation; galaxies: luminosity function, mass function

Journal Article.  6549 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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