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We report near-infrared K', L', and M' band imaging observations of thenearby merging galaxy NGC 6240 with the Infrared Camera and Spectrograph on theSubaru telescope. The observations were performed with the assistance of theSubaru Adaptive Optics System, and the achieved spatial resolutions were around0.10--0.20$^{\prime\prime}$. We also obtained new mid-infrared imaging in theSi-2 filter band (8.7$\mu$m) and N-band (7.5--13$\mu$m) spectroscopy of thisgalaxy with the CanariCam on the Gran Telescopio Canarias with a spatialresolution of 0.4--0.5$^{\prime\prime}$. In the K' band image the two nuclei ofthe galaxy each show a double-peak suggesting the complex geometry of thesource, while the L', M', and Si-2 band images show single compact structuresin each of the two nuclei. Assuming that the center core observed atwavelengths longer than 3.8$\mu$m is associated with dust heated by the buriedAGN, we re-evaluated the spectral energy distributions (SEDs) of the southernnucleus from 2 to 30$\mu$m with the additional literature values, and performedthe SED+spectroscopy fitting using the clumpy torus models of Nenkova et al.(2008) and a Bayesian fitting approach. The model fit suggests that the highcovering factor torus emission in the southern nucleus is also obscured byforeground dust in the host galaxy. The estimated AGN bolometric luminosity ofthe southern nucleus, $L_{\rm bol}({\rm AGN})\sim1\times10^{45}$[erg$\cdot$s$^{-1}$], accounts for approximately 40% of the whole luminosity ofthe system.

Near- to Mid- Infrared Imaging and Spectroscopy of Two Buried AGNs of the Nearby Merging Galaxy NGC 6240 with Subaru/IRCS+AO and GTC/CanariCam