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We present a large robust sample of 1503 reliable and unconfused 70micromselected sources from the multiwavelength data set of the Cosmic EvolutionSurvey (COSMOS). Using the Spitzer IRAC and MIPS photometry, we estimate thetotal infrared luminosity, L_IR (8--1000 microns), by finding the best fittemplate from several different template libraries. The long wavelength 70 and160 micron data allow us to obtain a reliable estimate of L_IR, accurate towithin 0.2 and 0.05 dex, respectively. The 70 micron data point enables asignificant improvement over the luminosity estimates possible with only a 24micron detection. The full sample spans a wide range in L_IR, L_IR ~ 10^8-10^14L_sun, with a median luminosity of 10^11.4 L_sun. We identify a total of 687luminous, 303 ultraluminous, and 31 hyperluminous infrared galaxies (LIRGs,ULIRGs, and HyLIRGs) over the redshift range 0.01<z<3.5 with a median redshiftof 0.5. Presented here are the full spectral energy distributions for each ofthe sources compiled from the extensive multiwavelength data set from theultraviolet (UV) to the far-infrared (FIR). Using SED fits we find possibleevidence for a subset of cooler ultraluminous objects than observed locally.However, until direct observations at longer wavelengths are obtained, the peakof emission and the dust temperature cannot be well constrained. We use theseSEDs, along with the deep radio and X-ray coverage of the field, to identify alarge sample of candidate active galactic nuclei (AGN). We find that thefraction of AGN increases strongly with L_IR, as it does in the local universe,and that nearly 70% of ULIRGs and all HyLIRGs likely host a powerful AGN.

A Multiwavelength Study of a Sample of 70 micron Selected Galaxies in the COSMOS Field I: Spectral Energy Distributions and Luminosities