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Title: Self-gravity in Magnetized Neutrino-dominated Accretion Disks

Abstract

In the present work we study self-gravity effects on the vertical structure of a magnetized neutrino-dominated accretion disk as a central engine for gamma-ray bursts (GRBs). Some of the disk physical timescales that are supposed to play a pivotal role in the late-time evolutions of the disk, such as viscous, cooling, and diffusion timescales, have been studied. We are interested in investigating the possibility of the occurrence of X-ray flares, observed in late-time GRBs’ 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 processes via highlighting the fragmentation mechanism in the outer disk, especially for the higher mass accretion rates.

Authors:
;  [1]
  1. Department of Physics, School of Science, Ferdowsi University of Mashhad, Mashhad, P.O. Box 91775-1436 (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22663256
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 845; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; COSMIC GAMMA BURSTS; DIFFUSION BARRIERS; EMISSION; GAMMA RADIATION; GRAVITATION; LUMINOSITY; MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS; MASS; NEUTRINOS; STAR EVOLUTION; X RADIATION

Citation Formats

Shahamat, Narjes, and Abbassi, Shahram, E-mail: abbassi@um.ac.ir. Self-gravity in Magnetized Neutrino-dominated Accretion Disks. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA7F28.
Shahamat, Narjes, & Abbassi, Shahram, E-mail: abbassi@um.ac.ir. Self-gravity in Magnetized Neutrino-dominated Accretion Disks. United States. doi:10.3847/1538-4357/AA7F28.
Shahamat, Narjes, and Abbassi, Shahram, E-mail: abbassi@um.ac.ir. Thu . "Self-gravity in Magnetized Neutrino-dominated Accretion Disks". United States. doi:10.3847/1538-4357/AA7F28.
@article{osti_22663256,
title = {Self-gravity in Magnetized Neutrino-dominated Accretion Disks},
author = {Shahamat, Narjes and Abbassi, Shahram, E-mail: abbassi@um.ac.ir},
abstractNote = {In the present work we study self-gravity effects on the vertical structure of a magnetized neutrino-dominated accretion disk as a central engine for gamma-ray bursts (GRBs). Some of the disk physical timescales that are supposed to play a pivotal role in the late-time evolutions of the disk, such as viscous, cooling, and diffusion timescales, have been studied. We are interested in investigating the possibility of the occurrence of X-ray flares, observed in late-time GRBs’ 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 processes via highlighting the fragmentation mechanism in the outer disk, especially for the higher mass accretion rates.},
doi = {10.3847/1538-4357/AA7F28},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 845,
place = {United States},
year = {2017},
month = {8}
}