The influence of magnetic fields on neutrino-dominated accretion disc

Details The influence of magnetic fields on neutrino-dominated accretion disc The influence of magnetic fields on neutrino-dominated accretion disc

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.398..583x&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 398, Issue 2, pp. 583-590.

Astronomy and Astrophysics

Astronomy

2

Accretion, Accretion Discs, Magnetic Fields, Methods: Numerical, Gamma-Rays: Bursts

Scientific paper

We consider the influence of magnetic fields on the model of neutrino-dominated accretion flows (NDAFs) for gamma-ray bursts (GRBs) via the assumption that the accretion rate of the disc is totally caused by the torque of the Lorentz force, i.e. the magnetic braking of large-scale magnetic fields and magnetic viscosity of small-scale magnetic fields. We calculate the structure, composition, luminosity of neutrino emission and the Poynting flux, and the rate of mass loss driven by neutrino heating or launched centrifugally by large-scale magnetic fields, based on the physical condition of the magnetized NDAFs. It is shown that the magnetized disc is favourable to interpret the diverse prompt emissions as well as the X-ray flares observed in the early afterglow of GRBs.

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