NOAO >   Observing Info >   Approved Programs >   2012A-0289

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Proposal Information for 2012A-0289


PI: Gregory Rudnick, University of Kansas, grudnick@ku.edu
Address: Physics Department, 1082 Malott, 1251 Wescoe Hall Drive, Lawrence, KS 66047, USA

CoI: Pascale Jablonka, EPFL, Ecole Polytechnique de Lausanne
CoI: Dennis Zaritksy, Steward Observatory, University of Arizona
CoI: Dennis Just, Steward Observatory, University of Arizona
CoI: Vandana Desai, Spitzer Science Center
CoI: Rose Finn, Siena College
CoI: Bianca Poggianti, Padova Observatory
CoI: Gabriella De Lucia, INAF - Osservatorio Astronomico di Trieste
CoI: Bo Milvang-Jensen, University of Copenhagen

Title: The Suppression of Star Formation in the Infall Regions of Clusters

Abstract: One of the most long-standing unresolved issues in our understanding of galaxy evolution is the degree to which clusters affect the properties of infalling galaxies. We propose to measure how and where star formation is suppressed in galaxies as they fall from the field into the cluster environment. In this proposal we are requesting NEWFIRM K_S-band imaging of our clusters and their outskirts to identify dusty galaxies that are transitioning to passive red-sequence galaxies. We will identify the dusty galaxies using a well-tested technique that employs rest-frame \uvr and \vjr colors. We will track the abundance of these dusty galaxies relative to local density and clustercentric radius, extending from the cluster center to 6 virial radii. We already have optical photometry and low dispersion spectroscopy covering the NEWFIRM field-of-view. The strengths of this survey are that: we are probing galaxy environments from the dense cluster cores to the surrounding field, we have ~ 1000 spectroscopic members over this wide field-of-view, and we are targeting an epoch when the galaxy population was still rapidly evolving. Coupling these results with theoretical models being developed by our group will allow us to determine when star formation is suppressed around clusters and on what timescale.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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