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We performed near-diffraction-limited (~0.4 FWHM) N-band imaging of one ofthe nearest Active Galactic Nucleus (AGN) in M51 with 8.2m Subaru telescope tostudy the nuclear structure and spectral energy distribution (SED) at 8-13 um.We found that the nucleus is composed of an unresolved core (at ~13 pcresolution, or intrinsic size corrected for the instrumental effect of <6 pc)and an extended halo (at a few tens pc scale), and each of their SEDs is almostflat. We examined the SED by comparing with the archival Spitzer IRS spectrumprocessed to mimic our chopping observation of the nucleus, and the publishedradiative-transfer model SEDs of the AGN clumpy dusty torus. The halo SED islikely due to circumnuclear star formation showing little Polycyclic AromaticHydrocarbon (PAH) emission due to the AGN. The core SED is likely dominated bythe AGN because of the following two reasons. Firstly, the clumpy torus modelSEDs can reproduce the red mid-infrared continuum with apparently moderatesilicate 9.7 um absorption. Secondly, the core 12 um luminosity and theabsorption-corrected X-ray luminosity at 2-10 keV in the literature follow themid-infrared-X-ray luminosity correlation known for the nearby AGNs includingthe Compton-thick ones.

Ground-Based Mid-Infrared Study of the Compton-Thick AGN in M51 at 10-100 pc Scale