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Estimate of SMBH Spin for Narrow-Line Seyfert 1 Galaxies

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arxiv 2304.00934 v1 pith:5SGZWPUI submitted 2023-04-03 astro-ph.GA

Mikhail Piotrovich , Stanislava Buliga , Tinatin Natsvlishvili This is my paper · ORCID
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keywords galaxiesspinaccretionseyfertdiskfoundlinenls1
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We estimated the spin values of the supermassive black holes (SMBHs) of the active galactic nuclei (AGN) for a large set of Narrow Line Seyfert 1 (NLS1) galaxies assuming the inclination angle between the line of sight and the axis of the accretion disk to be approximately 45 degrees. We found that for these objects the spin values are on average less than for the Seyfert 1 galaxies that we studied previously. In addition, we found that the dependencies of the spin on the bolometric luminosity and the SMBH mass are two to three times stronger that for Seyfert 1 galaxies, which could mean that at early stages of evolution NLS1 galaxies either have a low accretion rate or chaotic accretion, while at later stages they have standard disk accretion, which very effectively increases the spin value.

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  1. Estimating the spins of supermassive black holes in distant ultraluminous quasars

    astro-ph.HE 2025-05 conditional novelty 5.0 of 10

    Using radiative-efficiency scaling relations, the authors derive mostly a>0.9 spins for 6<z<7.5 ultraluminous quasars and interpret spin-mass-redshift correlations as evidence of high-rate disk accretion.

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