Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-02-04
Astronomy and Astrophysics
Astrophysics
10 pages, 2 figures. Accepted by ChJAA
Scientific paper
10.1088/1009-9271/8/4/04
We propose a three-stage model with Blandford-Znajek (BZ) and hyperaccretion process to interpret the recent observations of early afterglows of Gamma-Ray Bursts (GRBs). In the first stage, the prompt GRB is powered by a rotating black hole (BH) invoking the BZ process. The second stage is a quiet stage, in which the BZ process is shut off, and the accretion onto the BH is depressed by the torque exerted by the magnetic coupling (MC) process. Part of the rotational energy transported by the MC process from the BH is stored in the disk as magnetic energy. In the third stage, the MC process is shut off when the magnetic energy in the disk accumulates and triggers the magnetic instability. At this moment, the hyperaccretion process may onset, and the jet launched in this restarted central engine generates the observed X-ray flares. This model can account for energies and timescales of GRBs with X-ray flares observed in early afterglows.
Lei Wei-Hua
Wang Ding-Xiong
Zhang Lianchang
Zou Yuan-Chuan
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