相对论性冲击波遇到风终止激波时没有可见的光学变化
No visible optical variability from a relativistic blast wave encountering a wind-termination shock
摘要：
伽马射线暴的余辉耀斑和光学和X射线光变曲线的再增亮被归因于后期的内部引擎活动和爆炸周围介质的密度变化。为了检验后者，我们研究了伽玛射线爆发的相对论冲击波和恒星风终端冲击波之间的相遇。采用高性能的自适应网格相对论流体动力学程序AMRVAC模拟了爆炸波，并采用单独的辐射程序详细分析了同步辐射。我们发现，即使对于非常高的密度跳跃，在由此产生的光变曲线中也没有凸起。此外，通过分析从不同的冲击波区域的贡献，我们能够建立，它是必不可少的，以解决爆炸波结构，以便作出定性正确的预测所观察到的输出，从反向冲击区域的贡献将不会脱颖而出，即使当磁场增加在这个区域的重复冲击。这项研究解决了最近文献中的一个争议。
英文摘要：
Gamma-ray burst afterglow flares and rebrightenings of the optical and X-ray light curve have been attributed to both late time inner engine activity and density changes in the medium surrounding the burster. To test the latter, we study the encounter between the relativistic blast wave from a gamma-ray burster and a stellar wind termination shock. The blast wave is simulated using a high performance adaptive mesh relativistic hydrodynamics code, AMRVAC, and the synchrotron emission is analyzed in detail with a separate radiation code. We find no bump in the resulting light curve, not even for very high density jumps. Furthermore, by analyzing the contributions from the different shock wave regions we are able to establish that it is essential to resolve the blast wave structure in order to make qualitatively correct predictions on the observed output and that the contribution from the reverse shock region will not stand out, even when the magnetic field is increased in this region by repeated shocks. This study resolves a controversy in recent literature.
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