NOAO >   Observing Info >   Approved Programs >   2007A-0147

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Proposal Information for 2007A-0147


PI: Arjun Dey, NOAO, dey@noao.edu
Address: NGSC, 950 N. Cherry Ave., Tucson, AZ 85719, United States

CoI: Chris Willmer, Steward Observatory
CoI: Casey Papovich, Steward Observatory
CoI: Michael Brown, Princeton University
CoI: Buell Jannuzi, NOAO
CoI: Mark Dickinson, NOAO
CoI: Sandy Faber, University of California at Santa Cruz
CoI: Kate Brand, STScI

Title: Measuring the Evolving Space Density of the Red Galaxy Population

Abstract: \vspace-0.03in The galaxy luminosity function is a powerful probe of galaxy assembly and evolution. Recent measurements of the luminosity function evolution for the red galaxy population show significant disagreement, evidenced by differences in their measured number density and luminosity density at redshifts z~ 1. The existing data are not sufficient to determine whether this discrepancy arises from erroneous photometric redshifts or incompleteness corrections in the surveys. We propose to resolve this difference by tying together two discrepant surveys, the DEEP2 and NOAO Deep Wide-Field surveys, the largest spectroscopic and imaging surveys of z=1 galaxies, by imaging the DEEP2 Extended Groth Strip in the \it identical system (telescope+instrument+filters) used for the NDWFS. The resulting deep B_WRIz' photometric data set will be ~gt1 mag deeper than existing imaging in the field. It will provide a better estimate of the DEEP2 sample incompleteness, and improved calibration of the NDWFS photometric redshifts at z~gt 1 using the ~eq 10^4 DEEP2 spectroscopic redshifts. The resulting well-calibrated photo-z's will enable reliable studies of galaxy evolution and clustering over the full ~19\sq\deg of NDWFS+EGS, and support a variety of studies resulting from the exquisite multiwavelength data (including the new deep \it Spitzer Legacy survey) in the field.


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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