Structure Formation and Cosmology with high-z Clusters

SF histories of ETGs in clusters (and field) at z~1.2A long-standing prediction of hierarchical models is that early-type galaxies in the field are younger andless massive than those in cluster cores, since galaxy formation is accelerated in dense environments…(Gobat al. 2008; Rettura et al. 08,11, Tanaka et al. 11)RDCS 1252GOODS (z~1.25)• Star formation in clusters is accelerated, rather than significantly delayed• Galaxy mass regulates the timing of galaxy formation, the environment regulates the timescale of SFH