TY CONF TI Retrograde fall of intergalactic gas onto the S-galaxy: polar rings and activity of galactic nuclei KW physics and evolution of galaxies: gas accretion; active galactic nuclei; polar rings JO Modern astronomy: from the Early Universe to exoplanets and black holes AU Khrapov, S.. AU Khoperskov, A.. AU Khrapov, N.. PY 2024 PB Special Astrophysical Observatory of the Russian Academy of Sciences