NOAO >   Observing Info >   Approved Programs >   2005A-0476

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Proposal Information for 2005A-0476


PI: Yen-Ting Lin, University of Illinois, ylin2@astro.uiuc.edu
Address: Astronomy Department, 1002 W Green Street, Urbana, IL 61801, USA

CoI: Joseph J. Mohr, University of Illinois

Title: Evolution of the Halo Occupation Distribution

Abstract: We propose to obtain deep optical photometry at the KPNO 2.1m with the CCD Imager for a sample of 30 galaxy clusters at z\ge0.3 for which deep near-IR photometry is available to us. The primary goal of this program is to understand the galaxy population evolution and the star formation history within clusters. Our approach differs from previous investigations in that we attempt to provide observational constraints on the redshift evolution of the halo occupation distribution, which is an essential theoretical framework for galaxy formation. Clusters in our sample cover a broad range in both mass and redshift, and have been imaged in J & K_s and in X-ray out to a large fraction of the cluster virial radius. The optical photometry requested here would provide the cluster membership assignments via the photometric redshifts. Our multiband study will shed light on the evolution of the cluster luminosity function, the galaxy spatial distribution, the cluster baryon fraction, and the number of galaxies as a function of cluster mass, from 0.3\le z\le 0.9. Once the latter is understood, it can be used as a cluster mass estimator, which would be invaluable for large scale cluster surveys in optical/near-IR.


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NOAO >   Observing Info >   Approved Programs >   2005A-0476

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