Evolution of the color-magnitude relation at z 1

Details Evolution of the color-magnitude relation at z 1 Evolution of the color-magnitude relation at z 1

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20719007m&link_type=abstract

American Astronomical Society Meeting 207, #190.07; Bulletin of the American Astronomical Society, Vol. 37, p.1486

Astronomy and Astrophysics

Astronomy

Scientific paper

HST permits the study of high--z cluster galaxies in unprecedented detail and offers a unique opportunity to examine the processes driving galaxy evolution. As part of our Advanced Camera for Surveys (ACS) intermediate redshift cluster survey, we have observed 8 galaxy clusters with redshift between 0.8 and 1.3. At these redshifts, galaxy clusters are still assembling and galaxies are evolving towards the populations that we observe today. Recent results from the ACS cluster survey have shown that galaxy clusters at redshift around unity show differences but also many similarities with local clusters, in terms of galaxy populations and their distribution. One of the most striking similarities is that the tight relation between galaxy colors and luminosities that applies to local early-type galaxies (the color-magnitude relation; CMR) is already in place at redshifts as high as z 1.3. The precise measurement of the scatter around the CMRs of our cluster sample permits us to constrain the formation ages of the redder early-type population to be at z>2.5. We will present our most recent results and discuss them as a function of cluster properties at z 1.

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