  We investigate the virilization of the emission lines Hbeta and Mg II in the
sample of 287 Type 1 Active Galactic Nuclei taken from the Sloan Digital Sky
Survey database. We explore the connections between the intrinsic line shifts
and full widths at different levels of maximal intensity. We found that: (i)
Hbeta seems to be a good virial estimator of black hole masses, and an
intrinsic redshift of Hbeta is dominantly caused by the gravitational effect,
(ii) there is an anti-correlation between the redshift and width of the wings
of the Mg II line, (iii) the broad Mg II line can be used as virial estimator
only at 50% of the maximal intensity, while the widths and intrinsic shifts of
the line wings can not be used for this purpose.
