Geometric properties of the dust torus model by Kawaguchi & Mori when seen face-on. In three dimensions, the model is rotationally symmetric around the y-axis and mirrored on the x-axis. The BH is located at the origin (0,0). The adopted sublimation radius Rsub is 450 ld in polar direction. The thick red line indicates the border of the dust, and the volume filled by dust is shaded in red. The dust distribution is cut at a half-opening angle of 45°. For later comparison, the green line (labeled GKR-Parabola) indicates the slightly different bowl shape as given by Goad et al. (2012). The black curves show the isodelay surfaces with numbers giving the delay in days. The large black numbers along the bowl rim list the delay at that place. The black solid line at angle 40° to the equatorial plane indicates the potential distribution of the gas clouds (small black dots). The blue hatched area indicates Hα BLR that we see, adopting the LOC model of Baldwin et al. (1995). The thick blue lines indicate the average height (86 ld) and equatorial radius (156 ld) of the BLR.
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