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We explore the connections between the infrared and X-ray properties of AGNs.Using the well constrained infrared SEDs of a sample of local (i.e., z < 0.1)sample of X-ray AGNs, we develop new diagnostics that exploit 24um and 70umflux densities to identify AGN-dominated systems at z<1.5 and measure theirtotal infrared luminosities. We apply these diagnostics to the X-ray detectedAGNs in the Chandra Deep Field South and, in doing so, reveal that the infraredto X-ray luminosity ratio was a factor of ~12 higher in the early Universecompared to today. We explore possible explanations for this dramatic evolutionand demonstrate how forthcoming Herschel observations will discriminate betweenthese scenarios and, while doing so, identify potential Compton-thick AGNs.Summary of Mullaney et al., MNRAS, 401, 995 (2010).

The Synergy between Deep X-ray and Infrared Surveys: AGN and Star Formation Activity