An MMT hectospec redshift survey of 24 μm sources in the Spitzer First Look Survey

We present a spectroscopic survey using the MMT Hectospec fiber spectrograph of 24 mu m sources selected with the Spitzer Space Telescope in the Spitzer First Look Survey. We report 1296 new redshifts for 24 mu m sources, including 599 with f(v)(24 mu 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 similar to 90% complete for i <= 21 mag and f(v)(24 mu m) >= 1 mJy and 35% complete for i <= 20.5 mag and 0: 3 mJy <= f(v)(24 mu 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 mu 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.