Observing the build-up of the colour-magnitude relation at redshift ~0.8

Details Observing the build-up of the colour-magnitude relation at redshift ~0.8 Observing the build-up of the colour-magnitude relation at redshift ~0.8

2004-04-05

arxiv.org/abs/astro-ph/0404084v2

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, to appear in Proc. of IAU Colloq. 195: "Outskirts of Galaxy Clusters: Intense Life in the Suburbs" -- mino

Scientific paper

10.1017/S1743921304001024

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 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.

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