BZ-MC-BP Model for Jet Production from Black Hole Accretion Disc

TL;DR

This paper presents a comprehensive model combining BZ, MC, and BP mechanisms to explain jet production in black hole systems, emphasizing magnetic field configurations and their role in jet structure and energy transfer.

Contribution

It introduces a unified model that incorporates multiple energy mechanisms for jet production, constrained by magnetic field stability and black hole spin parameters.

Findings

Jets are driven by BZ in the Poynting flux regime.

Jets are driven by BP in the hydromagnetic regime.

The model explains spine/sheath jet structures in black hole sources.

Abstract

Three energy mechanisms invoking large-scale magnetic fields are incorporated in a model to interpret jet production in black hole (BH) systems, i.e., the Blandford-Znajek (BZ), the magnetic coupling (MC) and Blandford-Payne (BP) processes. These energy mechanisms can coexist in BH accretion disc based on the magnetic field configurations constrained by the screw instability, provided that the BH spin and the power-law index indicating the variation of the magnetic field at an accretion disc are greater than some critical values. In this model the jets are driven by the BZ process in the Poynting flux regime and by the BP process in the hydromagnetic regime, being consistent with the spine/sheath jet structure observed in BH sources of stellar and supermassive size.