Physics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop..586l&link_type=abstract
NOAO Proposal ID #2006B-0586
Physics
Scientific paper
We propose to obtain BRIJK_s imaging data for a sample of 21 clusters at z~ 0.3 and 0.5, with CTIO 4m+ISPI and 0.9m+T2K. The primary goal is to understand and quantify the evolution of cluster galaxies. Measurements of fundamental properties (e.g. the luminosity function, and scaling relation between total galaxy luminosity and cluster mass) of clusters at z~ 0 have lead to significant progress in modeling and understanding the formation and clustering of galaxies in the local Universe. In our first attempt to extend these measurements toward higher-z, we demonstrate that only with sufficient number of clusters in fine redshift bins can one obtain tight constraints on the evolution of the scaling relations. We plan to overcome the challenge by both significantly increasing the sample size at the redshift ranges mentioned above, and including color information in our analysis, so that the differential evolution of early- and late- type galaxies can be separated. The new observations will provide critical information on the physical processes that control the galactic contents in clusters out to z=0.6, and will allow tight constraints on simple theoretical modeling of galaxy clustering (e.g. halo occupation distribution) at intermediate-z to emerge.
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