NOAO >   Observing Info >   Approved Programs >   2005A-0208

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Proposal Information for 2005A-0208


PI: Dario Fadda, Spitzer Science Center, fadda@ipac.caltech.edu
Address: Mail Code 220-6, 1200 East California Blvd, Pasadena, CA 91125, USA

CoI: Francine Marleau, Spitzer Science Center
CoI: Lisa Storrie-Lombardi, Spitzer Science Center

Title: 24 (micron) Local Luminosity Function in the Spitzer FLS

Abstract: The local 24 (micron) luminosity function is the basic building block for evolution models trying to reproduce IR counts and the IR cosmic background. To derive this luminosity function, a complete dataset of redshifts is needed in a large enough field. The Spitzer First Look Survey (FLS) has imaged such a large area of the sky at 24 (mu)m, covering 4.4 sq. degrees. In this part of the sky, we have already obtained more than 300 redshifts of 24 (micron) sources by targeting radio/VLA sources in two previous successful WIYN/Hydra runs. Adding the matches from the SDSS database of spectra, we presently have redshifts for 30% of the 24 (micron) sources to a limiting magnitude of r'=19. We propose spectroscopic observations with WIYN/Hydra for the remaining ~ 1000 sources with r'<19. We will target low-z 24 (micron) sources in the range z=0 - 0.3 and construct a sample complete up to z=0.2. This local population of galaxies is under- represented in most redshift surveys (e.g. SDSS z \lesssim 0.1 or targeted deep pencil beam-z > 0.4 surveys). The wide-area coverage of the FLS, combined with the wide-angle grasp of the WIYN/Hydra combination, makes it possible to significantly impact the number of redshifts in this low-z range. The proposed observations will provide the only complete low-z survey in the study of the luminosity function of IR-luminous galaxies.


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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