SIMBAD references

2009ApJ...700.1970L - Astrophys. J., 700, 1970-1976 (2009/August-1)

Magnetically torqued neutrino-dominated accretion flows for gamma-ray bursts.

LEI W.H., WANG D.X., ZHANG L., GAN Z.M., ZOU Y.C. and XIE Y.

Abstract (from CDS):

Recent observations and theoretical work on gamma-ray bursts favor the central engine model of a Kerr black hole (BH) surrounded by a magnetized neutrino-dominated accretion flow (NDAF). The magnetic coupling between the BH and the disk through a large-scale closed magnetic field exerts a torque on the disk and transports the rotational energy from the BH to the disk. We investigate the properties of the NDAF with this magnetic torque. For a rapid spinning BH, the magnetic torque transfers enormous rotational energy from BH into the inner disk. There are two consequences: (1) the luminosity of neutrino annihilation is greatly augmented; (2) the disk becomes thermally and viscously unstable in the inner region, displaying s-shaped curves of the surface density versus accretion rate. It turns out that the magnetically torqued NDAF can be invoked to interpret the variability of gamma-ray luminosity. In addition, we discuss the possibility of restarting the central engine to produce the X-ray flares with required energy.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - black hole physics - gamma rays: bursts - magnetic fields - neutrinos

Simbad objects: 2

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2021.06.14-17:04:47

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