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A sublimation process governs the innermost region of the dusty torus ofactive galactic nuclei. However, the observed inner radius of the torus issystematically smaller than the expected radius by a factor of ~ 1/3. We showthat the anisotropy of the emission from accretion disks resolves this conflictnaturally and quantitatively. An accretion disk emits lesser radiation in thedirection closer to its equatorial plane (i.e., to the torus). We find that theanisotropy makes the torus inner region closer to the central black hole andconcave. Moreover, the innermost edge of the torus may connect with theoutermost edge of the disk continuously. Considering the anisotropic emissionof each clump in the torus, we calculate the near-infrared flux variation inresponse to a UV flash. For an observer at the polar angle theta_obs = 25 deg,the centroid of the time delay is found to be 37% of the delay expected in thecase of isotropic illumination, which explains the observed systematicdeviation.

Orientation Effects on the Inner Region of Dusty Torus of Active Galactic Nuclei