Jets, accretion and spin in supermassive black holes

TL;DR

This study investigates the relationship between black hole spin, accretion, and jet power in supermassive black holes, providing observational evidence linking high spin to radio-loudness and suggesting other factors influence jet formation.

Contribution

It offers new observational insights into how black hole spin correlates with jet properties and radio-loudness, supporting the hybrid model of jet power generation.

Findings

Weak correlation between radio luminosity and black hole spin.

Jet power explained by hybrid model with corona magnetic field.

High radio-loudness associated with high black hole spins.

Abstract

The theoretical model suggests that relativistic jets of AGN rely on the black hole spin and/or accretion. We study the relationship between jet, accretion, and spin using supermassive black hole samples with reliable spin of black holes. Our results are as follows: (1) There is a weak correlation between radio luminosity and the spin of black hole for our sample, which may imply that the jet of the supermassive black hole in our sample depends on the other physical parameters besides black hole spins, such as accretion disk luminosity. (2) The jet power of a supermassive black hole can be explained by the hybrid model with magnetic field of corona. (3) There is a significant correlation between radio-loudness and black hole spin for our sample. These sources with high radio-loudness tend to have high black hole spins. These results provide observational evidence that the black hole spin may explain the bimodal phenomena of radio-loud and radio-quiet AGN.