Self-Gravity in Magnetized Neutrino-Dominated Accretion Discs

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.

11 pages, 7 figures, accepted at ApJ

References in corpus (15)

• The Physics of Gamma-Ray Bursts and Relativistic Jets
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• Self-gravity in neutrino-dominated accretion disks
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• A MAD Model for Gamma-Ray Burst Variability
• Local stability of self-gravitating disks in $f(R)$ gravity
• BZ-MC-BP Model for Jet Production from Black Hole Accretion Disc
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Cited by in corpus (2)

• Viscous Evolution of Magnetized Clumps: a Source for X-ray Flares in Gamma-ray Bursts
• GRB variabilities and following gravitational waves induced by gravitational instability in NDAFs