Analytical study of diffusive relativistic shock acceleration.
Analytical study of diffusive relativistic shock acceleration.
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扩散相对论冲击加速度的分析研究。
DOI：
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发表时间：
2006
影响因子：
8.6
通讯作者：
U. Keshet
中科院分区：
文献类型：
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作者：
U. Keshet
在试验粒子小角散射极限下，对任意速度角扩散函数D，解析地研究了相对论激波中粒子的加速问题。粒子光谱指数s被发现是敏感的D，特别是下游和在某些角度。数值证实的分析，证明和推广以前的结果各向同性扩散。它可用于检验无碰撞激波模型和观测约束D。例如，强烈向前或向后增强扩散下游被排除的伽玛射线暴余辉观测。
Particle acceleration in relativistic shocks is studied analytically in the test-particle, small-angle scattering limit, for an arbitrary velocity-angle diffusion function D. The particle spectral index s is found to be sensitive to D, particularly downstream and at certain angles. The analysis, confirmed numerically, justifies and generalizes previous results for isotropic diffusion. It can be used to test collisionless shock models and to observationally constrain D. For example, strongly forward- or backward-enhanced diffusion downstream is ruled out by gamma-ray burst afterglow observations.