Galaxy Evolution in Red-Sequence Selected Clusters from the Spitzer First Look Survey

Details Galaxy Evolution in Red-Sequence Selected Clusters from the Spitzer First Look Survey Galaxy Evolution in Red-Sequence Selected Clusters from the Spitzer First Look Survey

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20517809m&link_type=abstract

American Astronomical Society Meeting 205, #178.09; Bulletin of the American Astronomical Society, Vol. 37, p.382

Astronomy and Astrophysics

Astronomy

Scientific paper

The Spitzer First Look Survey (FLS) covers an area of ˜ 4 square degrees with imaging in seven infrared bandpasses (3.6, 4.5, 5.8, 8.0, 24.0, 70.0, 160.0 microns) plus ground-based, R-band data. We have discovered about 100 galaxy clusters at 0.1 < z < 1.3 in the FLS based on their 0.67 - 3.6 micron color by adapting the cluster red-sequence technique of Gladders & Yee (2000) to the near-IR.
We present the first measurement of cluster luminosity functions in the IRAC channel 1 bandpass (3.6 micron). Because it samples the rest-frame near-IR to z > 1, the 3.6 micron luminosity function provides a good measure of the stellar mass function within the clusters. We measure the evolution in M* to z = 1.1, which is consistent with being dominated by an old, passively evolving population formed at high redshift.
We also study the abundance of 24 micron sources (likely dusty starburst galaxies) in the clusters as a function of redshift and radius. The detection of a significant number of these sources indicates that they are an important stage in cluster galaxy evolution. Furthermore, the distribution of the sources within the clusters may give clues about the role of the cluster environment in triggering these events.

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