Transonic properties of the accretion disk around compact objects

TL;DR

This paper explores the transonic behavior of accretion disks around compact objects like black holes and neutron stars, analyzing how fluid properties and sonic points depend on angular momentum and boundary conditions.

Contribution

It classifies four types of sonic points in accretion disks and examines how their properties vary with the angular momentum of the central object.

Findings

Four types of sonic/critical points identified in accretion disks.

Sonic point locations and properties depend on the angular momentum of the compact object.

Disk behavior differs significantly between black holes and neutron stars.

Abstract

An accretion flow is necessarily transonic around a black hole. However, around a neutron star it may or may not be transonic, depending on the inner disk boundary conditions influenced by the neutron star. I will discuss various transonic behavior of the disk fluid in general relativistic (or pseudo general relativistic) framework. I will address that there are four types of sonic/critical point possible to form in an accretion disk. It will be shown that how the fluid properties including location of sonic points vary with angular momentum of the compact object which controls the overall disk dynamics and outflows.