Torus model properties of an ultra-hard X-ray selected sample of Seyfert
  galaxies
  We characterize for the first time the torus properties of an ultra-hard
X-ray (14-195 keV) volume-limited (DL<40 Mpc) sample of 24 Seyfert (Sy)
galaxies (BCS40 sample). The sample was selected from the Swift/BAT nine month
catalog. We use high angular resolution nuclear infrared (IR) photometry and
N-band spectroscopy, the CLUMPY torus models and a Bayesian tool to
characterize the properties of the nuclear dust. In the case of the Sy1s we
estimate the accretion disk contribution to the subarcsecond resolution nuclear
IR SEDs (~0.4'') which is, on average, 46+-28, 23+-13 and 11+-5% in the J-, H-
and K-bands, respectively. This indicates that the accretion disk templates
that assume a steep fall for longer wavelengths than 1 micron might
underestimate its contribution to the near-IR emission. Using both optical
(broad vs narrow lines) and X-ray (unabsorbed vs absorbed) classifications, we
compare the global posterior distribution of the torus model parameters. We
confirm that Sy2s have larger values of the torus covering factor (CT~0.95)
than Sy1s (CT~0.65) in our volume-limited Seyfert sample. These findings are
independent of whether we use an optical or X-ray classification. We find that
the torus covering factor remains essentially constant within the errors in our
luminosity range and there is no clear dependence with the Eddington ratio.
Finally, we find tentative evidence that even an ultra hard X-ray selection is
missing a significant fraction of highly absorbed type 2 sources with very high
covering factor tori.
