Physics
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop11003l&link_type=abstract
HST Proposal ID #11003. Cycle 15
Physics
Scientific paper
We propose a joint Spitzer/HST program to map the best-studied large scale structure at high redshift -- a massive twelve-cluster supercluster at z = 0.9 which extends 15 Mpc x 100 Mpc. Because clusters are actively forming at this redshift, and significant evolution has already been observed in their galaxy populations, this survey will provide the crucial link between large scale structure and galaxy-scale physics. The supercluster is already the subject of a multi-faceted program including 1 deep r'i'z'K imaging from the Palomar 5-m to measure optical/near-IR colors, 2 spectroscopy with DEIMOS on the Keck 10-m to measure stellar content, [OII] equivalent widths, and internal velocities for over 330 supercluster members, 3 high-angular-resolution Chandra and VLA observations to study the starburst and AGN populations, and 4 an 80 ksec XMM observation to quantify the cluster gas properties and the amount of diffuse emission from the low-density filaments. The proposed 3.6-24 micron mapping is an essential complement to this program because it provides more accurate measures of stellar mass, star formation rate, and nuclear/starburst activity across the entire structure. The ACS observations will provide equal detail on galaxy structural properties and morphology. Together, the deep mid-infrared observations and the high-angular-resolution HST imagery along with our coordinated ground and space-based data will allow us to measure the stellar mass function, stellar population ages, and star formation rates over the full range of environmental densities; use galaxy morphology to determine what type of galaxies host AGN and which physical processes are responsible for gas-fueling events; quantify the IR/radio/X-ray correlations at z = 0.9; and determine the effect of large scale structure on the stellar and gas content of galaxies in the high-redshift Universe.
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