Detection of faint broad emission lines in type 2 AGN: II. On the
  measurement of the BH mass of type 2 AGN and the unified model
  We report the virial measurements of the BH mass of a sample of 17 type 2
AGN, drawn from the Swift/BAT 70-month 14-195 keV hard X-ray catalogue, where a
faint BLR component has been measured via deep NIR (0.8-2.5 $\mu$m)
spectroscopy. We compared the type 2 AGN with a control sample of 33 type 1
AGN. We find that the type 2 AGN BH masses span the 5$<$ log(M$_{BH}$
/M$_{\odot}$) $< $7.5 range, with an average log(M$_{BH}$/M$_{\odot}$) = 6.7,
which is $\sim$ 0.8 dex smaller than found for type 1 AGN. If type 1 and type 2
AGN of the same X-ray luminosity log($L_{14-195}$/erg s$^{-1}$) $\sim$ 43.5 are
compared, type 2 AGN have 0.5 dex smaller BH masses than type 1 AGN. Although
based on few tens of objects, this result disagrees with the standard AGN
unification scenarios in which type 1 and type 2 AGN are the same objects
observed along different viewing angles with respect to a toroidal absorbing
material.
