Lei 2009 磁化NDAF作为伽玛暴的中央引擎

主要内容:
MC-NDAF, 相比单纯的NDAF可以提高能量释放率, 可以用做伽玛暴的能源机制了.

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Title:		Magnetically Torqued Neutrino-Dominated Accretion Flows for Gamma-ray Bursts
Authors:		Lei, W. H.; Wang, D. X.; Zhang, L.; Gan, Z. M.; Zou, Y. C.; Xie, Y.
Publication:		eprint arXiv:0906.1635
Publication Date:		06/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		26 pages, 5 figures, accepted for publication in ApJ
Bibliographic Code:		2009arXiv0906.1635L

Abstract

Recent observations and theoretical work on gamma-ray bursts (GRBs) 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 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: (i) the luminosity of neutrino annihilation is greatly augmented; (ii) the disk becomes thermally and viscously unstable in the inner region, and behaves S-Shape of the surface density versus accretion rate. It turns out that 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.

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