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In this paper, we characterize the infrared spectral energy distributions(SEDs) of mid-IR selected z~0.3-3.0 and L_IR~10^11-10^13Lsun galaxies, andstudy how their SEDs differ from those of local and high-z analogs. Our mid-IRflux-limited sample of 191 sources is unique in size, and spectral coverage,including Spitzer mid-IR spectroscopy. Here we add Herschel photometry at250um, 350um, and 500um, which allows us to obtain accurate total IRluminosities, as well as constrain the relative contributions of AGN andstarbursts to those luminosities. Our sample constitutes ~23% AGN (i.e. wherethe AGN contributes >50% of L_IR), ~30% starbursts (where AGN contributes <20%of L_IR and the mid-IR spectra are starburst-like); and ~47% composites (whichshow both significant AGN and starburst activity). The AGN-dominated sourcesdivide into ones that show a strong silicate 9.7um absorption feature, implyinghighly obscured systems, and ones that do not. The high-tau_9.7 sources arehalf of our z>1.2 AGN, but show SEDs that are extremely rare among local AGN.The SEDs of our z~2 starburst-dominated ULIRGs are much closer to those oflocal LIRGs than ULIRGs. This is consistent with our earlier finding that,unlike local ULIRGs, our high-z starbursts are typically only in the earlystages of a merger. The SEDs of the composite sources are most similar to thelocal archetypal warm ULIRG, Mrk231. In summary, our results show that there isstrong evolution in the SEDs between local and z~2 IR-luminous galaxies, aswell as that there is a wide range of SEDs among high redshift IR-luminoussources. The publicly-available SED templates we derive from our sample will beparticularly useful for infrared population synthesis models, as well as in theinterpretation of other mid-IR high-z galaxies in particular those detected bythe recent all sky WISE survey.

Spitzer and Herschel-based SEDs of 24um-bright z~0.3-3.0 starbursts and obscured quasars