The first supermassive black hole mass measurement in active galactic
  nuclei using the polarization of broad emission line Mg II
  Spectropolarimetric efforts in the last few years have provided an efficient
method that is based on the profiles of the polarization plane position angle
of broad emission lines in active galactic nuclei (AGNs). Here we present black
hole measurements of SBS 1419+538 using spectropolarimetric observations in the
Mg II spectral band. The observations are performed by 6m telescope of SAO RAS
using SCORPIO-2. We found a good agreement for the estimated supermassive black
hole (SMBH) mass for this object using spectropolarimetry when compared with
the mass obtained using other methods.
