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We investigate the origin of the color-magnitude relation (CMR) observed incluster galaxies by using a combination of cosmological N-body/SPH simulationsof galaxy clusters, and a semi-analaytic model of galaxy formation (Lagos, Cora& Padilla 2008). Simulated results are compared with the photometric propertiesof early-type galaxies in the Antlia cluster (Smith Castelli et al. 2008). Thegood agreement obtained between observations and simulations allows us to usethe information provided by the model for unveiling the physical processes thatyield the tigh observed CMR.

The Color-Magnitude Relation of Cluster Galaxies: Observations and Model Predictions