Influence of toroidal magnetic field in multi-accreting tori

TL;DR

This paper investigates how toroidal magnetic fields influence the formation, stability, and evolution of multiple accretion tori around Kerr supermassive black holes, highlighting the role of magnetic and rotational parameters.

Contribution

It introduces a detailed analysis of magnetic field effects on multi-accreting tori, revealing their dependence on magnetic parameters and SMBH spin, which was not thoroughly explored before.

Findings

Magnetic fields and disk rotation strongly constrain torus formation.

Specific classes of tori depend on magnetic field parameters and SMBH spin.

RADs features are linked to magnetic and rotational properties.

Abstract

We analyzed the effects of a toroidal magnetic field in the formation of several magnetized accretion tori, dubbed as ringed accretion disks (RADs), orbiting around one central Kerr supermassive Black Hole (SMBH) in AGNs, where both corotating and counterotating disks are considered. Constraints on tori formation and emergence of RADs instabilities, accretion onto the central attractor and tori collision emergence, are investigated. The results of this analysis show that the role of the central BH spin-mass ratio, the magnetic field and the relative fluid rotation and tori rotation with respect the central BH, are crucial elements in determining the accretion tori features, providing ultimately evidence of a strict correlation between SMBH spin, fluid rotation and magnetic fields in RADs formation and evolution. More specifically we proved that magnetic field and disks rotation are in fact strongly constrained, as tori formation and evolution in RADs depend on the toroidal magnetic fields parameters. Eventually this analysis identifies specific classes of tori, for restrict ranges of magnetic field parameter, that can be observed around some specific SMBHs identified by their dimensionless spin.