The Era of Star Formation in Galaxy Clusters
I will describe the emerging evidence for an epoch of significant growth of cluster galaxies at z ~ 1.5. This evidence rules out the (overly) simplistic galaxy formation models that seem to fit the data at later times (i.e., at z < 1). New measurements of rapid evolution in a number of critical probes of the growth of cluster galaxies -- including a census of their stars, their star formation histories, and the rates of ongoing star formation, merger, and black hole activity -- all suggest the z ~ 1.5 era is a very active one in the formation and assembly of massive cluster galaxies.
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