PI: David Gilbank, University of Toronto, firstname.lastname@example.org
Address: Dept. of Astronomy and Astrophysics, 60 St. George Street, Toronto, Ontario M5S 3H8, Canada
CoI: Francisco Javier Castander, Institut d'Estudis Espacials de Catalunya, Spain
CoI: Michael Balogh, University of Durham
CoI: Richard Bower, University of Durham
Title: Tracing Galaxy Transformation around a pair of z=0.4 Clusters
Abstract: The Sloan and 2dF galaxy redshift surveys have recently uncovered evidence for a 'critical local density' above which star formation in galaxies has been terminated. We propose to search for a similar effect at the cosmologically interesting epoch of z~0.4, where the global star formation rate was significantly higher. We shall use the wide- field capability of Mosaic to efficiently study galaxy transformation in the environment around an interesting pair of galaxy clusters at z=0.41, and within a connecting intercluster filament. We will derive photometric redshifts from BVRI imaging with Mosaic, calibrated with our extensive spectroscopic survey undertaken on 8-m class telescopes to probe much fainter than the spectroscopic limit of current wide-field 8- m class surveys. With these photometric redshifts we can study the colours and hence star formation properties of cluster members as a function of local density and compare with the relations found locally in the Sloan and 2dF galaxy redshift surveys.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360