Assembly of the Red Sequences in Galaxy Clusters

Details Assembly of the Red Sequences in Galaxy Clusters Assembly of the Red Sequences in Galaxy Clusters

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21932901s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #329.01

Astronomy and Astrophysics

Astronomy

Scientific paper

I present results for the assembly and star formation histories of massive red sequence galaxies in over ten spectroscopically-confirmed, infrared-selected galaxy clusters at 1.0 < z < 1.8, the precursors to present-day massive clusters. Using rest-frame optical photometry, we investigate evolution in the color and scatter of the red sequence galaxy population, comparing with models of possible star formation histories. In contrast to many similar studies at lower redshift, these galaxies are clearly inconsistent with the continued passive evolution of stars formed and assembled at a single, much-earlier time. This sample exhibits a striking range in the inferred formation epochs of cluster red sequences, reflecting either a wide diversity of single-burst formation epochs or the effects of significant progenitor bias owing to ongoing assembly. We discuss the implications of simple manifestations of ongoing stellar assembly on the observed colors, which generally indicate that cluster ellipticals began forming a significant mass of stars at z > 4, were identifiable as red spheroids by z = 1.5 at the latest, and were actively assembling much of their final mass during 1 < z < 2 in the form of younger stars.

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