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We present results from the fitting of infrared (IR) spectral energydistributions of 21 active galactic nuclei (AGN) with clumpy torus models. Wecompiled high spatial resolution ($\sim 0.3$--$0.7$ arcsec) mid-IR $N$-bandspectroscopy, $Q$-band imaging and nuclear near- and mid-IR photometry from theliterature. Combining these nuclear near- and mid-IR observations, far-IRphotometry and clumpy torus models, enables us to put constraints on the torusproperties and geometry. We divide the sample into three types according to thebroad line region (BLR) properties; type-1s, type-2s with scattered or hiddenbroad line region (HBLR) previously observed, and type-2s without any publishedHBLR signature (NHBLR). Comparing the torus model parameters gives us the firstquantitative torus geometrical view for each subgroup. We find that NHBLR AGNhave smaller torus opening angles and larger covering factors than those ofHBLR AGN. This suggests that the chance to observe scattered (polarized) fluxfrom the BLR in NHBLR could be reduced by the dual effects of (a) lessscattering medium due to the reduced scattering volume given the small torusopening angle and (b) the increased torus obscuration between the observer andthe scattering region. These effects give a reasonable explanation for the lackof observed HBLR in some type-2 AGN.

On the difference of torus geometry between hidden and non-hidden broad line active galactic nuclei