Probing the Active Galactic Nuclei Unified Model Torus Properties in
  Seyfert Galaxies
  We studied the physical parameters of a sample comprising of all Spitzer/IRS
public spectra of Seyfert galaxies in the mid-infrared (5.2-38$\mu$m range)
under the active galactic nuclei (AGN) unified model. We compare the observed
spectra with $\sim10^6$ CLUMPY model spectral energy distributions, which
consider a torus composed of dusty clouds. We find a slight difference in the
distribution of line-of-sight inclination angle, $i$, requiring larger angles
for Seyfert 2 (Sy2) and a broader distribution for Seyfert 1 (Sy1). We found
small differences in the torus angular width, $\sigma$, indicating that Sy1 may
host a slightly narrower torus than Sy2. The torus thickness, together with the
bolometric luminosities derived, suggest a very compact torus up to $\sim$6 pc
from the central AGN. The number of clouds along the equatorial plane, $N$, as
well the index of the radial profile, $q$, are nearly the same for both types.
These results imply that the torus cloud distribution is nearly the same for
type 1 and type 2 objects. The torus mass is almost the same for both types of
activity, with values in the range of $M_{tor}\sim$10$^{4}-$10$^{7}\rm
M_{\odot}$. The main difference appears to be related to the clouds' intrinsic
properties: type 2 sources present higher optical depths $\tau_V$. The results
presented here reinforce the suggestion that the classification of a galaxy may
depend also on the intrinsic properties of the torus clouds rather than simply
on their inclination. This is in contradiction with the simple geometric idea
of the unification model.
