Global dynamics of advection-dominated accretion flows with magnetically driven outflow

TL;DR

This paper investigates how magnetically driven outflows influence the structure and dynamics of advection-dominated accretion flows around black holes, revealing significant changes in accretion rates and plasma temperatures.

Contribution

It provides a detailed analysis of the global structure of ADAFs with outflows, highlighting deviations from previous power-law models and the impact on ion-electron temperatures.

Findings

Mass accretion rate follows a power-law in outer regions

Outflows significantly reduce ion and electron temperatures

ADAF structure is markedly altered by outflows

Abstract

We study the global dynamics of advection-dominated accretion flows (ADAFs) with magnetically driven outflows. A fraction of gases in the accretion flow is accelerated into the outflows, which leads to decreasing of the mass accretion rate in the accretion flow towards the black hole. We find that the r-dependent mass accretion rate is close to a power-law one, m_dot r^s, as assumed in the advection-dominated inflow-outflow solution (ADIOS), in the outer region of the ADAF, while it deviates significantly from the power-law r-dependent accretion rate in the inner region of the ADAF. It is found that the structure of the ADAF is significantly changed in the presence of the outflows. The temperatures of the ions and electrons in the ADAF decreases in the presence of outflows, as a fraction of gravitational power released in the ADAF is tapped to accelerate the outflows.