Resistive and magnetized accretion flows with convection

TL;DR

This paper investigates how convection influences resistive, magnetized radiatively inefficient accretion flows, revealing that convection affects velocities and sound speed, and can be significant in such astrophysical environments.

Contribution

It introduces a self-similar model of resistive, magnetized RIAFs with convection, using both free parameter and mixing-length theory approaches.

Findings

Convection decreases accretion and rotational velocities.

Convection increases sound speed.

Convection is significant in magnetized, resistive RIAFs.

Abstract

We considered the effects of convection on the radiatively inefficient accretion flows (RIAF) in the presence of resistivity and toroidal magnetic field. We discussed the effects of convection on transports of angular momentum and energy. We established two cases for the resistive and magnetized RIAFs with convection: assuming the convection parameter as a free parameter and using mixing-length theory to calculate convection parameter. A self-similar method was used to solve the integrated equations that govern the behavior of the presented model. The solutions showed that the accretion and rotational velocities decrease by adding the convection parameter, while the sound speed increases. Moreover, by using mixing-length theory to calculate convection parameter, we found that the convection can be important in RIAFs with magnetic field and resistivity.