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The build-up of the red-sequence in galaxy clusters since z 0.8
release_zj4r43sporcjtata2gdmyselti
by
G. De Lucia,
D.
Clowe,
R.
Pello',
S.
D. M. White Osservatorio
Astronomico di Padova,
Italy; Steward
Observatory,
University of Arizona; Observatoire de Paris,
Meudon Cedex,
France; Observatoire
Midi-Pyrenees,
Toulouse,
France; Herzberg Institute of Astrophysics,
Victoria,
Canada)
Released
as a article
.
2004
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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