An MMT Hectospec Redshift Survey of 24 m Sources in the Spitzer First Look Survey**This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407.
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We present a spectroscopic survey using the MMT Hectospec fiber spectrograph of 24 m sources selected with the Spitzer Space Telescope in the Spitzer First Look Survey. We report 1296 new redshifts for 24 m sources, including 599 with f(24 m) 1 mJy. Combined with 291 additional redshifts for sources from the Sloan Digital Sky Survey (SDSS), our observing program was highly efficient and is 90% complete for i 21 mag and f(24 m) 1 mJy and 35% complete for i 20.5 mag and 0.3 mJy f(24 m) < 1.0 mJy. Our Hectospec survey includes 1078 and 168 objects spectroscopically classified as galaxies and QSOs, respectively. Combining the Hectospec and SDSS samples, we find 24 m-selected galaxies to z gal 0.98 and QSOs to Z QSO 3.6, with mean redshifts of z gal = 0.27 and (Z QSO) = 1.1. As part of this publication, we include the redshift catalogs and the reduced spectra; these are also available through the NASA/IPAC Infrared Science Archive. 2006. The American Astronomical Society. All rights reserved.
