Determination of the Physical Parameters of AGNs in Seyfert 1 Galaxies LEDA 3095839 and VII Zw 244 Based on Spectropolarimetric Observations

TL;DR

This study uses spectropolarimetric observations of two Seyfert 1 galaxies to determine their supermassive black hole parameters, including mass, spin, and magnetic field strength, revealing differences in scattering properties.

Contribution

It provides new measurements of SMBH spin, mass, and magnetic fields in two Seyfert galaxies using spectropolarimetry, highlighting the role of scattering in these AGNs.

Findings

LEDA 3095839 shows no signs of equatorial scattering.

VII Zw 244 exhibits equatorial scattering, allowing SMBH mass and inclination measurement.

Black hole spin and magnetic field strength were estimated for both galaxies.

Abstract

Here we present the detailed investigation of AGNs in two Seyfert 1 galaxies, LEDA 3095839 and VII Zw 244. Both of them were observed within the photometric reverberation mapping project in Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS), during which we earlier obtained the SMBHs masses. After that, both galaxies were observed in spectropolarimetric and polarimetric modes on the BTA 6 m telescope of the SAO RAS with the focal reducer SCORPIO-2. The linear polarization of the continuum and broad Balmer lines has been measured. It was found that (i) there were no signs of equatorial scattering in the LEDA 3095839 galaxy in the broad H-alpha line, and we were able to estimate the value of SMBH spin and the magnetic field strength in the disk from the level of continuum polarization; (ii) for the galaxy VII Zw 244, the presence of equatorial scattering was shown, due to which the mass of the SMBH was independently measured, the inclination angle of the system was obtained, and the value of the spin was estimated.