Journal Article

New evidence for a linear colour–magnitude relation and a single Schechter function for red galaxies in a nearby cluster of galaxies down to <i>M</i>*+ 8

S. Andreon, J.-C. Cuillandre, E. Puddu and Y. Mellier

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 372, issue 1, pages 60-68
Published in print October 2006 | ISSN: 0035-8711
Published online September 2006 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2006.10745.x
New evidence for a linear colour–magnitude relation and a single Schechter function for red galaxies in a nearby cluster of galaxies down to M*+ 8

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The colour and luminosity distributions of red galaxies in the cluster Abell 1185 (z= 0.0325) were studied down to M*+ 8 in the B, V and R bands. The colour–magnitude (CM) relation is linear without evidence for significant bending down to absolute magnitudes that are seldom probed in the literature (MR=−12.5 mag). The CM relation is thin (±0.04 mag) and its thickness is quite independent of the magnitude. The luminosity function (LF) of red galaxies in Abell 1185 is adequately described by a Schechter function, with a characteristic magnitude and a faint end slope that also well describe the LF of red galaxies in other clusters. There is no passband dependence of the LF shape other than an obvious M* shift due to the colour of the considered population. Finally, we conclude that, based on colours and luminosity, red galaxies form a homogeneous population over four decades in stellar mass, providing a second piece of evidence against faint red galaxies being a recent cluster population.

Keywords: methods: statistical; galaxies: clusters: general; galaxies: clusters: individual: Abell 1185; galaxies: evolution; galaxies: fundamental parameters; galaxies: luminosity function, mass function

Journal Article.  7648 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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