Color Bimodality in Galaxy Clusters to z = 1.

Details Color Bimodality in Galaxy Clusters to z = 1. Color Bimodality in Galaxy Clusters to z = 1.

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20719005l&link_type=abstract

American Astronomical Society Meeting 207, #190.05; Bulletin of the American Astronomical Society, Vol. 37, p.1485

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the evolution of the color bimodality of galaxy clusters from z = 0.45 to z = 0.95 using a homogeneously selected sample of ˜ 2000 clusters with B{gc, red} > 300 (corresponding to Abell Richness Class > 0; comoving density < 10-5 h3 Mpc-3) drawn from the 92 deg2 Red-Sequence Cluster Survey (RCS). The red fraction of galaxies decreases as a function of redshift for all cluster-centric radii, consistent with the Butcher-Oemler (1978) effect. The color-radius relation is also well established at all redshifts, with the red fraction decreasing toward the cluster outskirts. We detected a more rapid rate of redshift evolution in the red fraction at the cluster core compared to the cluster outskirts, suggesting that the higher galaxy infall rate at earlier times contributes significantly to the Butcher-Oemler effect seen in these clusters. This work is partially funded by NSF AST 0206154 and NASA.

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