arXiv 0811.35662008-11astro-ph

用cosmic-ray修正激波研究超新星遗迹中的等离子体温度

On the plasma temperature in supernova remnants with cosmic-ray modified shocks

L. O'C. Drury, F. A. Aharonian, D. Malyshev, S. Gabici

备注：: Appendix A added, minor changes and additional references included
DOI：: 10.1051/0004-6361/200811394

摘要：

内容：超新星遗迹的多波长观测可以在扩散激波加速理论的框架内得到解释，该理论允许爆炸能量有效地转化为宇宙射线。虽然非线性冲击模型相当好地描述了发射的非热成分，但某些问题，包括热等离子体的加热和相关的X射线发射，仍然没有解决。目的：探讨前向激波处强粒子加速对超新星遗迹演化和结构的影响。方法：结合物理过程的详细讨论分析估计。结果如下：整体动态被证明是相对不敏感的粒子加速量，但冲击后气体温度可以降低到一个相对较小的倍数，甚至小到六倍，环境温度与冲击速度的依赖性非常弱。这与纯气体模型形成鲜明对比，在纯气体模型中，温度对环境温度不敏感，并且由激波速度的平方确定。因此，似乎有可能通过强粒子加速来有效地抑制来自遗迹的热X射线发射。这可能为理解TeV明亮超新星遗迹RX J1713.7-3946缺乏热X射线提供线索。

英文摘要：

Context: Multiwavelength observations of supernova remnants can be explained within the framework of the diffusive shock acceleration theory, which allows effective conversion of the explosion energy into cosmic rays. Although the models of nonlinear shocks describe reasonably well the nonthermal component of emission, certain issues, including the heating of the thermal plasma and the related X-ray emission, remain still open. Aims: To discuss how the evolution and structure of supernova remnants is affected by strong particle acceleration at the forward shock. Methods: Analytical estimates combined with detailed discussion of the physical processes. Results: The overall dynamics is shown to be relatively insensitive to the amount of particle acceleration, but the post-shock gas temperature can be reduced to a relatively small multiple, even as small as six times, the ambient temperature with a very weak dependence on the shock speed. This is in marked contrast to pure gas models where the temperature is insensitive to the ambient temperature and is determined by the square of the shock speed. It thus appears to be possible to suppress effectively thermal X-ray emission from remnants by strong particle acceleration. This might provide a clue for understanding the lack of thermal X-rays from the TeV bright supernova remnant RX J1713.7-3946.

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