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We combine data from two all-sky surveys in order to study the connectionbetween the infrared and hard X-ray (>10keV) properties for local activegalactic nuclei (AGN). The Swift/Burst Alert Telescope all-sky survey providesan unbiased, flux-limited selection of hard X-ray detected AGN.Cross-correlating the 22-month hard X-ray survey with the AKARI all-sky survey,we studied 158 AGN detected by the AKARI instruments. We find a strongcorrelation for most AGN between the infrared (9, 18, and 90 micron) and hardX-ray (14-195 keV) luminosities, and quantify the correlation for varioussubsamples of AGN. Partial correlation analysis confirms the intrinsiccorrelation after removing the redshift contribution. The correlation for radiogalaxies has a slope and normalization identical to that for Seyfert 1s,implying similar hard X-ray/infrared emission processes in both. In contrast,Compton-thick sources show a large deficit in the hard X-ray band, because highgas column densities diminish even their hard X-ray luminosities. We proposetwo photometric diagnostics for source classification: one is an X-rayluminosity vs. infrared color diagram, in which type 1 radio-loud AGN are wellisolated from the others in the sample. The other uses the X-ray vs. infraredcolor as a useful redshift-independent indicator for identifying Compton-thickAGN. Importantly, Compton-thick AGN and starburst galaxies in composite systemscan also be differentiated in this plane based upon their hard X-ray fluxes anddust temperatures. This diagram may be useful as a new indicator to classifyobjects in new and upcoming surveys such as WISE and NuSTAR.

Infrared and hard X-ray diagnostics of AGN identification from the Swift/BAT and AKARI all-sky surveys