The build-up of the colour-magnitude relation in galaxy clusters since z ∼ 0.8

Gabriella De Lucia, Bianca M. Poggianti, Alfonso Aragón-Salamanca, Simon D.M. White, Dennis Zaritsky, Douglas Clowe, Claire Halliday, Pascale Jablonka, Anja Von Der Linden, Bo Milvang-Jensen, Roser Pelló, Gregory Rudnick, Roberto P. Saglia, Luc Simard

Research output: Contribution to journalArticlepeer-review

178 Scopus citations

Abstract

Using galaxy clusters from the ESO Distant Cluster Survey, we study how the distribution of galaxies along the colour-magnitude relation has evolved since z ∼ 0.8. While red-sequence galaxies in all these clusters are well described by an old, passively evolving population, we confirm our previous finding of a significant evolution in their luminosity distribution as a function of redshift. When compared to galaxy clusters in the local Universe, the high-redshift EDisCS clusters exhibit a significant deficit of faint red galaxies. Combining clusters in three different redshift bins, and defining as 'faint' all galaxies in the range 0.4 ≳ L/L≳ 0.1, we find a clear decrease in the luminous-to-faint ratio of red galaxies from z ∼ 0.8 to ∼0.4. The amount of such a decrease appears to be in qualitative agreement with predictions of a model where the blue bright galaxies that populate the colour-magnitude diagram of high-redshift clusters, have their star formation suppressed by the hostile cluster environment. Although model results need to be interpreted with caution, our findings clearly indicate that the red-sequence population of high-redshift clusters does not contain all progenitors of nearby red-sequence cluster galaxies. A significant fraction of these must have moved on to the red sequence below z ∼ 0.8.

Original languageEnglish (US)
Pages (from-to)809-822
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume374
Issue number3
DOIs
StatePublished - Jan 2007

Keywords

  • Galaxies: clusters: general
  • Galaxies: evolution
  • Galaxies: fundamental parameters
  • Galaxies: luminosity function, mass function

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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