Self-gravity in neutrino-dominated accretion disks

TL;DR

This paper investigates how self-gravity influences the structure and neutrino emission of accretion disks around compact objects, highlighting effects at high accretion rates and implications for gamma-ray burst phenomena.

Contribution

It provides a detailed analysis of the impact of self-gravity on the vertical structure and neutrino luminosity of neutrino-dominated accretion disks, including gravitational stability considerations.

Findings

Self-gravity causes significant structural changes in outer disk regions at high accretion rates.

Neutrino luminosity slightly increases due to self-gravity effects.

Disk gravitational instability may explain late-time gamma-ray burst flares.

Abstract

We present the effects of the self-gravity on the vertical structure and neutrino luminosity of the neutrino-dominated accretion disks in cylindrical coordinates. It is found that significant changes of the structure appear in the outer region of the disk, especially for high accretion rates (e.g., $\ga 1 M_\odot~\rm s^{-1}$), and thus causes the slight increase of the neutrino luminosity. Furthermore, the gravitational instability of the disk is reviewed by the vertical distribution of the Toomre parameter \citep{Toomre1964}, which may account for the late-time flares in gamma-ray bursts and the extended emission in short-duration gamma-ray bursts.