The Growth Of The Red-sequence In Clusters Since z≈1

Details The Growth Of The Red-sequence In Clusters Since z≈1 The Growth Of The Red-sequence In Clusters Since z≈1

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21630705m&link_type=abstract

American Astronomical Society, AAS Meeting #216, #307.05; Bulletin of the American Astronomical Society, Vol. 41, p.868

Astronomy and Astrophysics

Astronomy

Scientific paper

Galaxy clusters are gravitationally bounded structures in the Universe, which are inhabited by several thousands of galaxies in a very small region in the sky. The central megaparsec of clusters is dominated by early type galaxies, which are observed to obey tight empirical scaling relations as the fundamental plane and the red-sequence. In this work, we present deep Js and Ks-band imaging of 15 galaxy clusters at z≈1, which were discovered in the Red-Sequence Cluster Survey (RCS-1) and followed up using the VLT/ISAAC instrument. We built the Ks-band luminosity function for the composite cluster down to M*+2.5 through the application of a background subtraction method, and we found that it can be described by a Schechter function with Ks*=18.82 and α=-0.42. Furthermore, we built the background subtracted color-magnitude diagram for the composite cluster and measured for the first time the ratio of luminous-to-faint red-sequence galaxies at z=1 from a large ensemble of clusters. We found an increase of 100% in this ratio from z=0.45 to 1.0, that can be explained by a simple evolutionary model developed in this work consisting in an early truncation of the star formation for bright cluster galaxies and a delayed truncation for faint cluster galaxies.
Our results suggest that bright cluster galaxies formed most of their stellar content at z=3, that faint cluster galaxies are still forming stars at z=1, and that the red-sequence is not yet fully in place at z=1.
RPM was supported by a Proyecto MECESUP PUC609, Fondo Gemini 2008 Nº 32080004 and Fondo ALMA-CONICYT Nº 31070007.

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