NOAO >   Observing Info >   Approved Programs >   2008B-0072

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Proposal Information for 2008B-0072


PI: Dario Fadda, IPAC - Caltech, fadda@ipac.caltech.edu
Address: NASA Herschel Science Center, 770 South Wilson Avenue, Pasadena, CA 91125, USA

CoI: David T Frayer, IPAC - Caltech
CoI: Francine R Marleau, SSC - Caltech
CoI: Louise Edwards, IPAC - Caltech

Title: Infrared luminosity function from wide-field Spitzer surveys

Abstract: We propose a spectroscopic follow-up of the 70(micron) sources in two fields observed with Spitzer: the Lockman Hole and the Subaru XMM Deep Field. These data will allow us to compute the redshift distribution and the luminosity function of the 70(micron) sources using data from 12 sq degs overcoming the usual problems of this kind of studies as heavy reliance on photometric redshifts, AGN contamination, cosmic variance and systematic errors in the extrapolation of the total infrared fluxes from mid-infrared fluxes. The chosen fields are ideal for cosmological studies because of their low Galactic absorption column density and the large amount of ancillary data (UV, optical, X-ray and radio imaging). Unfortunately, only a handful of redshifts are known for galaxies in these fields, mainly of high- redshift or X-ray sources. The proposed program is perfectly suited for Hydra/WIYN because of its wide field coverage (12 sq deg) and the optimal source density (75/sq deg). This will be the first direct follow-up of 70(micron) sources detected by Spitzer in these two fields which will be soon reobserved at longer wavelengths by the Herschel space telescope.


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