Spins of SMBHs in distant low luminosity AGNs

TL;DR

This study estimates the spins, masses, and radiative efficiencies of 33 distant low luminosity AGNs, revealing high spins and a strong correlation between spin and mass, indicating disk accretion as the main growth mechanism.

Contribution

It provides the first detailed analysis of SMBH spins and masses in distant low luminosity AGNs, highlighting the spin-mass correlation and its implications for black hole growth.

Findings

Most SMBHs have spins greater than 0.8.

Strong correlation between SMBH spin and mass.

No significant differences in spin characteristics compared to other AGN types.

Abstract

We estimated radiative efficiency, spin and SMBH mass values for sample of 33 distant low luminosity AGNs. The distribution of the estimated spin values (majority of objects have a spin greater than 0.8) is fairly typical for many types of AGNs. The dependence of the estimated spin values on the estimated SMBH masses shows strong correlation between them, which suggests a rapid increase in spin with mass, i.e. that the main mechanism of mass growth in this case is disk accretion. We did not find any significant qualitative differences in the spin characteristics between our objects and objects of other types considered in the paper.