NOAO >   Observing Info >   Approved Programs >   2005A-0133

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Proposal Information for 2005A-0133


PI: Andrew Hopkins, University of Pittsburgh, ahopkins@phyast.pitt.edu
Address: Department of Physics and Astronomy, 3941 O'Hara St, Pittsburgh, PA 15260, USA

CoI: Andrew Connolly, University of Pittsburgh

Title: A Statistical Measure of Galaxy Evolution

Abstract: The evolution of the properties of galaxies as a function of redshift provides a sensitive probe of the theories of galaxy formation and evolution. At faint magnitudes the standard approach has been to measure these properties (luminosity, color and clustering) as a function of magnitude or limiting magnitude. Due to the broad width of the redshift distribution at faint magnitudes it becomes progressively harder to determine which populations of galaxies are evolving. If, however, we utilize multicolor information to derive photometric redshifts (photo-z's) we can define narrow intervals in redshift over which to measure the statistical nature of the galaxies. In a series of pilot studies we have demonstrated that we can measure the luminosity function, spectral type and clustering of galaxies as a function of photo-z. We have further been highly successful in obtaining wide-area multicolor data (UBVRI) with the MOSAIC camera on the KPNO 4 m to address the limitations imposed on such studies by small areas, and initial studies of clustering properties using photo-z's from this data are highly promising. Obtaining reliable photo-z's beyond z~ 0.7 from this data is currently hampered by the lack of z-band photometry, and we therefore request time to obtain this data to complement our existing deep multicolor survey, and achieve the goal of providing a definitive measure of galaxy evolution (through the luminosity function, clustering and distribution of galaxy spectral types as a function of photo-z) well beyond z~0.7.


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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