Self-Gravity in Magnetized Neutrino-Dominated Accretion Discs

TL;DR

This study examines how self-gravity influences the vertical structure and physical processes in magnetized neutrino-dominated accretion discs, shedding light on late-time gamma-ray burst phenomena.

Contribution

It introduces a detailed analysis of self-gravity effects on NDAF structure, highlighting its role in amplifying magnetic and Blandford-Payne luminosities while suppressing neutrino emission.

Findings

Self-gravity amplifies magnetic fields and BP luminosity.

Self-gravity suppresses neutrino luminosity.

Fragmentation in outer disc may explain X-ray flares.

Abstract

What is conducted in the present work is the study of self-gravity effects on vertical structure of magnetized neutrino-dominated accretion disc (termed NDAF and considered as a central engine for Gamma-ray bursts (GRBs)). Some of the disc physical time scales such as viscous, cooling and diffusion time scales, that are supposed to play a pivotal role in the late time evolutions of the disc, have been studied. It is of our interest to investigate the possibility of the X-ray flares occurrence, observed in late time GRB's extended emission through the "magnetic barrier" and "fragmentation" processes in our model. The results lead us to interpret self-gravity as an amplifier for Blandford-Payne luminosity (BP power) and the generated magnetic field, but a suppressor for neutrino luminosity and magnetic barrier process via highlighting fragmentation mechanism in the outer disc, especially for the higher mass accretion rates.