Advection-dominated Accretion: From Sgr A* to other Low-luminosity AGNs

TL;DR

This paper reviews the physics of advection-dominated accretion flows in low-luminosity AGNs, focusing on Sgr A* and discussing the role of jets, to enhance understanding of black hole accretion processes.

Contribution

It provides a comprehensive review of advection-dominated accretion in LLAGNs, emphasizing Sgr A* and exploring jet contributions, highlighting current understanding and gaps.

Findings

Accretion physics is similar across LLAGNs regardless of accretion rate.

Jets may play an important but less established role in LLAGNs.

Sgr A* serves as a key example for understanding low-luminosity black hole accretion.

Abstract

This paper reviews our current understanding of low-luminosity AGNs (LLAGNs) in the context of the advection-dominated accretion flow. The best investigated source, the supermassive black hole in our galactic center, Sgr A*, is emphasized since the physics of accretion should be the same for various LLAGNs except for their different accretion rates. The important role of jets is discussed, but this is less well established.