Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-14
Astrophys.J.629:L81-L84,2005
Astronomy and Astrophysics
Astrophysics
7 pages including 3 figures, emulateapj5.sty, accepted for publication in ApJ Letters
Scientific paper
10.1086/449312
The brightest giant flare from the soft $\gamma$-ray repeater (SGR) 1806-20 was detected on 2004 December 27. The isotropic-equivalent energy release of this burst is at least one order of magnitude more energetic than those of the two other SGR giant flares. Starting from about one week after the burst, a very bright ($\sim 80$ mJy), fading radio afterglow was detected. Follow-up observations revealed the multi-frequency light curves of the afterglow and the temporal evolution of the source size. Here we show that these observations can be understood in a two-component explosion model. In this model, one component is a relativistic collimated outflow responsible for the initial giant flare and the early afterglow, and another component is a subrelativistic wider outflow responsible for the late afterglow. We also discuss triggering mechanisms of these two components within the framework of the magnetar model.
Dai Gao Z.
Huang Yun-Feng
Wang Xiang-Yu
Wu Xiu-Fang
Zhang Bing
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