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The build-up of the red-sequence in galaxy clusters since z~0.8

G. De Lucia·B. M. Poggianti·A. Aragon-Salamanca·D. Clowe·C. Halliday·P. Jablonka·B. Milvang-Jensen·R. Pello'·S. Poirier·G. Rudnick·R. Saglia·L. Simard·S. D. M. White
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Abstract

We study the rest-frame (U-V) color-magnitude relation in 4 clusters at redshifts 0.7-0.8, drawn from the ESO Distant Cluster Survey. We confirm that red-sequence galaxies in these clusters can be described as an old, passively-evolving population and we demonstrate, by comparison with the Coma cluster, that there has been significant evolution in the stellar mass distribution of red-sequence galaxies since z~0.75. The EDisCS clusters exhibit a deficiency of low luminosity passive red galaxies. Defining as `faint' all galaxies in the passive evolution corrected range 0.4>~ L/L*>~0.1, the luminous-to-faint ratio of red-sequence galaxies varies from 0.34+/-0.06 for the Coma cluster to 0.81+/-0.18 for the high redshift clusters. These results exclude a synchronous formation of all red-sequence galaxies and suggest that a large fraction of the faint red galaxies in current clusters moved on to the red-sequence relatively recently. Their star formation activity presumably came to an end at z<~0.8.

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G. De Lucia, B. M. Poggianti, A. Aragon-Salamanca, D. Clowe, C. Halliday, P. Jablonka, B. Milvang-Jensen, R. Pello', S. Poirier, G. Rudnick, R. Saglia, L. Simard, S. D. M. White. 2004-06-21. The build-up of the red-sequence in galaxy clusters since z~0.8. https://doi.org/10.1086/423373

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