Document 
| Abstract | PDF (197.9 KB) | PS (1.427 MB) | References | HTML | Simbad Objects | NASA ADS Abstract Service |
A&A 468, 563-569 (2007)
DOI: 10.1051/0004-6361:20066219
A model of the light curves of gamma-ray bursts
W. H. Lei, D. X. Wang, B. P. Gong, and C. Y. HuangDepartment of Physics, Huazhong University of Science and Technology, Wuhan, 430074, P.R. China
e-mail: dxwang@mail.hust.edu.cn
(Received 9 August 2006 / Accepted 6 March 2007)
Abstract
Aims.An extreme Kerr black hole (BH) surrounded by a
precessing disk is invoked to explain the light curves of gamma-ray
bursts (GRBs) based on the coexistence of the Blandford-Znajek (BZ)
and the magnetic coupling (MC) processes.
Methods.The overall shape of the
light curves and the duration of GRBs are interpreted by the
evolution of the half-opening angle of the magnetic flux on the BH
horizon, and the complex temporal structures are modulated by the
precession and nutation of the jet powered by the BZ process.
Results.The
time profile of the emission exhibits a fast rise and a slow decay
due to the effect of the evolution of the half-opening angle. The
light curves of several GRBs are well fitted by this model with only
six free parameters.
Key words: gamma rays: bursts -- black hole physics -- accretion, accretion disk -- magnetic fields
© ESO 2007