The growth of the red-sequence in clusters since ≃1

Details The growth of the red-sequence in clusters since ≃1 The growth of the red-sequence in clusters since ≃1

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010hia....15...88m&link_type=abstract

Highlights of Astronomy, Volume 15, p. 88-88

Astronomy and Astrophysics

Astronomy

Galaxies: Clusters: General, Galaxies: Evolution, Galaxies: Formation

Scientific paper

We use deep nIR imaging of 15 galaxy clusters at z ≃ 1 to study the build-up of the red-sequence in rich clusters since the Universe was half its present age. We measured, for the first time, the luminous-to-faint ratio of red-sequence galaxies at z=1 from a large ensemble of clusters, and found an increase of 100% in the ratio of luminous-to-faint red-sequence galaxies from z=0.45 to 1.0. The measured change in this ratio as function of redshift is well-reproduced by a simple evolutionary model developed in this work, that consists in an early truncation of the star formation for bright cluster galaxies and a delayed truncation for faint cluster galaxies.

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