Exploring the Web : Galaxy Evolution in High-Redshift Superclusters

Details Exploring the Web : Galaxy Evolution in High-Redshift Superclusters Exploring the Web : Galaxy Evolution in High-Redshift Superclusters

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50342l&link_type=abstract

Spitzer Proposal ID #50342

Physics

Scientific paper

We propose deep IRAC and MIPS mapping of the Cl 1324 supercluster at z = 0.7 which contains 7+ clusters and extends 22 Mpc x 100 Mpc. The supercluster is already the subject of a multi-faceted program including (1) deep r'i'z'JK imaging from the Palomar 5-m and UKIRT 3.8-m to measure optical/near-IR colors, (2) spectroscopy with DEIMOS on the Keck 10-m to measure stellar content and [OII] emission for over 400 supercluster members, and (3) high-angular-resolution Chandra and VLA observations to study the starburst and AGN populations. Based on comparisons with our well-studied (in the optical, mid-IR, radio, and X-ray) and similarly-sized Cl 1604 supercluster at z = 0.9, we find significant evolution over only ~1 Gyr, with substantially smaller contributions from [OII]-emitting and starburst galaxies in the Cl 1324 supercluster. Because dust will severely bias measurements made in the optical, we require 3.6-24 micron observations to measure accurately stellar mass, star formation rate, and nuclear/starburst activity in the member galaxies and determine the true extent of evolution over this timescale. With the combined observations of the Cl 1324 and Cl 1604 superclusters, we have the unique opportunity to constrain the effect of large scale environment on galaxy evolution, the physical mechanisms responsible for fueling starburst and nuclear activity, and the timescales of gas quenching and black-hole accretion.

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