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Observing the build–up of the colour-magnitude relation at redshift $\sim0.8$

Published online by Cambridge University Press:  06 October 2004

G. De Lucia
Affiliation:
MPA, Garching, Germany
B. M. Poggianti
Affiliation:
Osservatorio Astronomico di Padova, Italy
A. Aragón-Salamanca
Affiliation:
University of Nottingham, UK
D. Clowe
Affiliation:
Steward Observatory, Tucson, USA
C. Halliday
Affiliation:
Osservatorio Astronomico di Padova, Italy
P. Jablonka
Affiliation:
OPM, Paris, France
B. Milvang-Jensen
Affiliation:
MPE, Garching, Germany
R. Pelló
Affiliation:
OMP Toulouse, France
S. Poirier
Affiliation:
OPM, Paris, France
G. Rudnick
Affiliation:
MPA, Garching, Germany
R. Saglia
Affiliation:
MPE, Garching, Germany
L. Simard
Affiliation:
HIA, Victoria, Canada
S. D. M. White
Affiliation:
MPA, Garching, Germany
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Abstract

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We analyse the rest–frame (U$-$V) colour–magnitude relation for 2 clusters at redshift 0.7 and 0.8, drawn from the ESO Distant Cluster Survey. By comparing them with the population of red galaxies in the Coma cluster, we show that the high redshift clusters exhibit a deficit of passive faint red galaxies. Our results show that the red–sequence population cannot be explained in terms of a monolithic and synchronous formation scenario. A large fraction of faint passive galaxies in clusters today has moved onto the red sequence relatively recently as a consequence of the fact that their star formation activity has come to an end at $z<0.8$.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Copyright
© 2004 International Astronomical Union