NOAO >   Observing Info >   Approved Programs >   2004B-0065

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Proposal Information for 2004B-0065


PI: David Gilbank, University of Toronto, gilbank@astro.utoronto.ca
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.


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NOAO >   Observing Info >   Approved Programs >   2004B-0065

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