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arXiv 0902.0233astro-ph.HE
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从冲击波到观测

From blast wave to observation

H. J. van Eerten, R. A. M. J. Wijers

摘要:

伽马射线暴(GRB)的余辉是由相对论性爆炸波与GRB母体周围介质相互作用产生的同步辐射很好地描述的。我们介绍了一个代码来重建光谱和光变曲线从任意流体配置,使其特别适合于研究流体流动的影响超出那些可以用解析近似描述。作为我们的代码的检查和第一个应用程序,我们使用它来拟合余辉光谱的理论模型的标度系数。我们推广其他作者的早期结果一般环爆流密度剖面。我们重新推导了GRB 970508的物理参数,并与其他作者的结果进行了比较。我们还展示了相对论性冲击波遇到风终止激波时产生的光变曲线。从高分辨率的计算中我们发现,所观测到的从星风型光变曲线到星际介质型光变曲线的过渡是平滑的,没有短时瞬变的特征。

英文摘要:

Gamma-ray burst (GRB) afterglows are well described by synchrotron emission originating from the interaction between a relativistic blast wave and the external medium surrounding the GRB progenitor. We introduce a code to reconstruct spectra and light curves from arbitrary fluid configurations, making it especially suited to study the effects of fluid flows beyond those that can be described using analytical approximations. As a check and first application of our code we use it to fit the scaling coefficients of theoretical models of afterglow spectra. We extend earlier results of other authors to general circumburst density profiles. We rederive the physical parameters of GRB 970508 and compare with other authors. We also show the light curves resulting from a relativistic blast wave encountering a wind termination shock. From high resolution calculations we find that the observed transition from a stellar wind type light curve to an interstellar medium type light curve is smooth and without short-time transitory features.

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