  The masses of 68 supermassive black holes (SMBHs) in nearby (z<0.15) active
galactic nuclei (AGNs) detected by the INTEGRAL observatory in the hard X-ray
energy band (17-60 keV) outside the Galactic plane (|b| > 5 degrees) have been
estimated. Well-known relations between the SMBH mass and (1) the infrared
luminosity of the stellar bulge (from 2MASS data) and (2) the characteristics
of broad emission lines (from RTT-150 data) have been used. A comparison with
the more accurate SMBH mass estimates obtained by the reverberation-mapping
technique and from direct dynamical measurements is also made for several
objects. The SMBH masses derived from the correlation with the bulge luminosity
turn out to be systematically higher than the estimates made by other methods.
The ratio of the bolometric luminosity to the critical Eddington luminosity has
been found for all AGNs. It ranges from 1 to 100% for the overwhelming majority
of objects.
