Color Bimodality in Galaxy Clusters since z ˜ 0.9

Details Color Bimodality in Galaxy Clusters since z ˜ 0.9 Color Bimodality in Galaxy Clusters since z ˜ 0.9

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..379..294e&link_type=abstract

Cosmic Frontiers ASP Conference Series, Vol. 379, proceedings of the conference held 31 July-4 August 2006 at Durham University,

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Scientific paper

We analyze galaxy colors from a sample of ˜ 2000 galaxy clusters with 0.4 < z < 0.9 and richness greater than B_{gc}= 300 Mpc^{1.77} (˜ 450 km/sec) from the 90 square degree RCS-1 survey. We find that cluster galaxies exhibit bimodality, with a distinct red sequence plus a broader population of blue galaxies, tep[e.g.,] []{hogg03}. This latter component increases with redshift and radius, confirming a version of the `Butcher-Oemler' effect tep[][and many others subsequently]{bo78}. There may be a mild differential evolution as a function of cluster radius. The properties of the blue galaxies are predominantly those of normal star-forming spirals, with only a small fraction showing the very blue colors expected of unobscured starburst galaxies. We suggest that the bulk of these galaxies are normal infalling field galaxies which will join the cluster red sequence as their star formation declines.

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