aat Acta Astrophys. Tau. Acta Astrophysica Taurica 2712-925X Kiselev Nikolai Nikolaevich, Mosсow, settlement Moskovskii, Tat'yanin Park Str., 12, Moscow, Russia. RU 37 10.31059/aat.vol3.iss1.pp44-47 Crimean-2021 AGN Conference proceedings Determination of supermassive black hole spins in active galactic nuclei Mikhailov Alexander Radio Astrophysics Laboratory, Special Astrophysical Observatory of RAS, Nizhny Arkhyz, 369167, Russia 22 03 2022 3 1 44 47 05 12 2021 Copyright (c) Mikhailov A. Mikhailov A. The metadata for this submission is licensed under a Creative Commons Attribution 4.0 International License. Copyright and publishing rights for texts published in Acta Astrophysica Taurica is retained by the authors, with first publication rights granted to the journal.Texts are free to use with proper attribution and link to the licensing (Creative Commons Attribution 4.0 International).

Abstract Black hole spin is a key to the relativistic jet generation. Existing models are based on the Blandford–Znajek and/or Blandford–Payne mechanisms. The jet power in these models is determined by the spin value, black hole mass, magnetic fields at the event horizon, and the accretion disc. Independent estimates of mass, jet power, and magnetic field give opportunity to constrain the supermassive black hole spin value. We present an application of this approach for supermassive black holes in different samples of active galactic nuclei (AGNs). We found that the assumption about equipartition between magnetic field energy density and accreting matter energy density is reasonable for the systems with thin accretion discs. The “mass-spin” diagrams were constructed for the samples of PG quasars and distant quasars at redshift z ≈ 4.8 and demonstrated the flattening region at masses M BH ≈ 10 8.5 M ☉ . These diagrams can be used to study accretion onto supermassive black holes.

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