Open AccessDetermination of the magnetic field strength and geometry in the accretion disks of AGNs
Author(s) -
M. Piotrovich,
S. Buliga,
Tinatin Natsvlishvili
Publication year - 2022
Publication title -
astronomy at the epoch of multimessenger studies. proceedings of the vak-2021 conference, aug 23–28, 2021
Language(s) - English
Resource type - Conference proceedings
DOI - 10.51194/vak2021.2022.1.1.158
Subject(s) - physics , astrophysics , observatory , accretion disc , magnetic field , polarization (electrochemistry) , accretion (finance) , supermassive black hole , galaxy , radius , telescope , brewster's angle , line of sight , position angle , astronomy , optics , quantum mechanics , chemistry , computer security , brewster , computer science
Based on the spectropolarimetric data of 33 Seyfert type 1 galaxies observed with the BTA-6m telescope of the SpecialAstrophysical Observatory, we estimated the magnetic eld values at the event horizon of the supermassive black hole B Hand the exponents of the power-law dependence s of the magnetic eld on the radius. We used the model of Shakura-Sunyaevaccretion disk. The average value of log B H [G] was found to be ∼ 4. The average value of s is ≈ 1.7, and its distributionmaximum span is in the range of 1.85 < s < 2.0. This is a rather interesting result, since s = 5/4 is usually adoptedin calculations for Shakura-Sunyaev accretion disks. For two objects PG 1545+210 and 2MASX J06021107+2828382, themeasured degree of polarization is greater than the maximum possible value at the angle between the line of sight and theaxis of the accretion disk i = 45 ◦ . It was concluded that for these objects the angle should be closer to i = 60 ◦ .