风环境中外震早期X射线余辉的浅衰减相
Shallow decay phase of the early X-ray afterglow from the external shock in wind environment
摘要：
由{ \it Swift}发现的伽马射线暴早期X射线余辉的浅衰变相是一个广泛讨论的话题。由于谱指数在浅衰变相到正常相的转变过程中没有变化，这意味着这种转变应该是一种动力学变化而不是谱的演化。我们认为，浅衰减相和正常相都是在风环境中的外震，而转换时间是减速时间。我们将该模型应用于050319和081008伽玛暴，发现通过选择适当的参数可以很好地解释它们。
英文摘要：
The shallow decay phase of the early X-ray afterglow in gamma-ray bursts discovered by {\it Swift} is a widely discussed topic. As the spectral index does not change at the transferring of the shallow decay phase to a normal phase, it implies this transferring should be a dynamical change rather than a spectral evolution. We suggest both the shallow decay phase and the normal phase are from the external shock in a wind environment, while the transferring time is the deceleration time. We apply this model to GRBs 050319 and 081008, and find them can be well explained by choosing a proper set of parameters.
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