Dynamical mass of type 2 Seyfert nuclei

We have derived the masses of central objects (M-BH) of nine type 2 Seyfert nuclei using the observational properties of the hidden broad H beta emission. We obtain the average dynamical mass log (M-BH/M-circle dot) similar or equal to 8.00 +/- 0.51 - 0.475 log (tau(es)/1), where tau(es) is the optical depth for electron scattering. If tau(es) similar to 1, this average mass is almost comparable with those of type 1 Seyfert nuclei. However, if tau(es) much less than 1, as is usually considered, the average mass of type 2 Seyfert nuclei may be more massive than that of type 1 Seyfert nuclei. We discuss implications for issues concerning both the current unified model of Seyfert nuclei and physical conditions of the electron scattering regions.