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The X-ray and mid-IR emission from active galactic nuclei (AGN) are stronglycorrelated. However, while various published parameterizations of thiscorrelation are consistent with the low-redshift, local Seyfert galaxypopulation, extrapolations of these relations to high luminosity differ by anorder of magnitude at nuL(nu)(6um) = 1e47 erg/s. Using data from the Wide-fieldInfrared Survey Explorer, we determine the mid-IR luminosities of the mostluminous quasars from the Sloan Digital Sky Survey and present a revisedformulation of the X-ray to mid-IR relation of AGN which is appropriate fromthe Seyfert regime to the powerful quasar regime.

The X-Ray to Mid-Infrared Relation of AGN at High Luminosity