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We explore the effects of active galactic nuclei (AGN) and star formationactivity on the infrared (0.3-1000 microns) spectral energy distributions ofluminous infrared galaxies from z = 0.5 to 4.0. We have compiled a large sampleof 151 galaxies selected at 24 microns (S24 > 100 uJy) in the GOODS-N and ECDFSfields for which we have deep Spitzer IRS spectroscopy, allowing us todecompose the mid-IR spectrum into contributions from star formation and AGNactivity. A significant portion (~25%) of our sample is dominated by an AGN inthe mid-IR. Based on the mid-IR classification, we divide our full sample intofour sub-samples: z~1 star-forming (SF) sources; z~2 SF sources; AGN with clear9.7 micron silicate absorption; and AGN with featureless mid-IR spectra. Fromour large spectroscopic sample and wealth of multi-wavelength data, includingdeep Herschel imaging at 100, 160, 250, 350, and 500 microns, we use 95galaxies with complete spectral coverage to create a composite spectral energydistribution (SED) for each sub-sample. We then fit a two-temperature componentmodified blackbody to the SEDs. We find that the IR SEDs have similar cold dusttemperatures, regardless of the mid-IR power source, but display a markeddifference in the warmer dust temperatures. We calculate the average effectivetemperature of the dust in each sub-sample and find a significant (~20 K)difference between the SF and AGN systems. We compare our composite SEDs tolocal templates and find that local templates do not accurately reproduce themid-IR features and dust temperatures of our high redshift systems. Highredshift IR luminous galaxies contain significantly more cool dust than theirlocal counterparts. We find that a full suite of photometry spanning the IRpeak is necessary to accurately account for the dominant dust temperaturecomponents in high redshift IR luminous galaxies.

GOODS-Herschel: Impact of Active Galactic Nuclei and Star Formation Activity on Infrared Spectral Energy Distributions at High Redshift