Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-11-15
Chin.J.Astron.Astrophys. 4 (2004) 455-472
Astronomy and Astrophysics
Astrophysics
26 pages including 11 figures
Scientific paper
Optical and radio afterglows arising from the shocks by relativistic conical ejecta running into pre-burst massive stellar winds are revisited. Under the homogeneous thin-shell approximation and a realistic treatment for the lateral expansion of jets, our results show that a notable break exists in the optical light curve in most cases we calculated in which the physical parameters are varied within reasonable ranges. For a relatively tenuous wind which cannot decelerate the relativistic jet to cause a light curve break within days, the wind termination shock due to the ram pressure of the surrounding medium occurs at a small radius, namely, a few times 10^{17} cm. In such a structured wind environment, the jet will pass through the wind within several hours and run into the outer uniform dense medium. The resulting optical light curve flattens with a shallower drop after the jet encounters the uniform medium, and then declines deeply, triggered by runaway lateral expansion.
Dai Gao Z.
Huang Yun-Feng
Ma Hai-Tao
Wu Xiu-Fang
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