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arXiv 1402.5162astro-ph.HE
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具有能量注入的自相似相对论爆炸波

Self-similar relativistic blast waves with energy injection

Hendrik van Eerten

摘要:

一个足够强大的天体物理源,在时间上具有幂律光度,将产生一个自相似的相对论性冲击波,其中一个反向冲击波进入喷出物,一个正向冲击波进入周围介质。一旦能量注入停止,最后的能量被输送到冲击波阵面,爆炸波将过渡到另一个自相似阶段,这只取决于注入的能量的总量。我描述了有限的持续时间的能量注入到环境中的密度取决于半径的幂律的效果,强调光学/X射线伽马射线暴余辉的应用。爆炸波注入过程中进行了处理解析,过渡后,最后的能量注入与一维模拟。给出了正激波区和反向激波区同步辐射的通量方程。反向冲击发射很容易占主导地位,特别是在两个区域的磁化不同的情况下。反向激波发射被证明支持所报道的X射线和余辉平台持续时间和结束时间通量之间的光学相关性,独立于光度幂律斜率。该模型通过应用于爆发120521 A和090515,并可以适应其陡峭的后坪光变曲线斜率。

英文摘要:

A sufficiently powerful astrophysical source with power law luminosity in time will give rise to a self-similar relativistic blast wave with a reverse shock traveling into the ejecta and a forward shock moving into the surrounding medium. Once energy injection ceases and the last energy is delivered to the shock front, the blast wave will transit into another self-similar stage depending only on the total amount of energy injected. I describe the effect of limited duration energy injection into environments with density depending on radius as a power law, emphasizing optical / X-ray Gamma-ray Burst afterglows as applications. The blast wave during injection is treated analytically, the transition following last energy injection with one-dimensional simulations. Flux equations for synchrotron emission from the forward and reverse shock regions are provided. The reverse shock emission can easily dominate, especially with different magnetizations for both regions. Reverse shock emission is shown to support both the reported X-ray and optical correlations between afterglow plateau duration and end time flux, independently of the luminosity power law slope. The model is demonstrated by application to bursts 120521A and 090515, and can accommodate their steep post-plateau light curve slopes.

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