Based on the measurements of the Stokes parameters in the continuum and
in the broad 0.6563 nm hydrogen emission line obtained with the 6-m
telescope for the Seyfert galaxy Mkn 6, secular variability of the
hydrogen line profile polarization was discovered; a time lag of less
than 2 days between the continuum flux and the polarized continuum
emission was determined which corresponds to the size of the region
where the polarization of the continuum occurs, less than 0.001 pc.
The hydrogen line emission time lag is equal to approximately 20 days.
Contact - Borisov N.V.
An analysis of the data in the Stokes parameter plane shows that the
polarization in the continuum is caused by the emission of the accretion
disk and the relativistic jet, and by the scattering on the gas-and-dust
torus in the case of the broad hydrogen lines. It was shown for the first
time that the analysis of the polarization angle dependence on the
velocity across the hydrogen line profiles due to the gas emission
in the broad-line formation region near the massive AGN allows to
determine directly from observations the type of motion in the
broad-line formation region, which in the case of Mkn 6 turned
out to be Keplerian at distances less than 0.02 pc from the nucleus.
The lower mass limit determined for the supermassive black hole in
the center of the Mkn 6 galaxy is equal to 150 million solar masses.
V.L.Afanasiev, L.C.Popovic, A.I.Shapovalova, N.V.Borisov,
D.Ilic; Variability in Spectropolarimetric properties of Sy 1.5 galaxy
Mrk6; eprint arXiv:1310.1179
V.L.Afanasiev, L.C.Popovic, A.I.Shapovalova, N.V.Borisov, D.Ilic;
Variability in Spectropolarimetric properties of Sy 1.5 galaxy Mrk6;