Particle Acceleration in Relativistic Flows
Particle Acceleration in Relativistic Flows
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相对论流中的粒子加速
DOI：
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发表时间：
2005
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影响因子：
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通讯作者：
J. Kirk
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文献类型：
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作者：
J. Kirk
几种不同的高能伽玛射线天体物理源的共同特性是以相对论速度存在的体运动。非热辐射粒子的本征谱也显示出有趣的相似之处，向低能方向明显硬化。这表明两种不同的加速机制可能在这些源中起作用。在高能量下，激波下的随机一阶费米过程似乎提供了一个合理的解释。我将简要回顾这一机制的现状，然后讨论在较低能量下，相对论性电流片的感应电场中的非随机加速度起作用的可能性。
A property common to several different astrophysical sources of high-energy gamma-rays is the presence of bulk motion at relativistic speed. The intrinsic spectra of the nonthermal radiating particles also show interesting similarities, with a pronounced hardening towards lower energies. This suggests two distinct acceleration mechanisms could be at work in these sources. At high energies, the stochastic first-order Fermi process at shocks seems to provide a reasonable explanation. I will briefly review the status of this mechanism before discussing the possibility that, at lower energies, non-stochastic acceleration in the induced electric field of a relativistic current sheet plays a role.