Stochastic Electron Acceleration in SNR RX J1713.7-3946
首发时间:2012-01-10
Abstract:Stochastic acceleration of charged particles due to their interactions with plasma waves may be responsible for producing superthermal particles in a variety of astrophysical systems. This process can be described as a diffusion process in the energy space with the Fokker-Planck equation. In this paper, a time-dependent numerical code is used to solve the reduced Fokker-Planck equation involving only time and energy variables with general forms of the diffusion coefficients. We also propose a self-similar model for particle acceleration in Sedov explosions and use the TeV SNR RX J1713.7-3946 as an example to demonstrate the model characteristics. Markov Chain Monte Carlo method is utilized to constrain model parameters with observations.
keywords: acceleration of particles: MHD: plasmas: shock waves: turbulence
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SNR RX J1713.7-3946中的随机电子加速
摘要:在许多天体系统中,带电粒子与等离子体波相互作用的随机加速可能产生超热粒子。这个过程可在能量空间中用Fokker-Planck方程来描述扩散过程。在本文中,针对扩散系数的普遍形式,我们用时间依赖的数值程序来解简化的只涉及时间和能量变量的Fokker-Planck方程。在Sedov膨胀相中的粒子加速,我们用自相似模型,并用TeV超新星遗迹RX J1713.7-3946作为例子来证明我们的模型特征,并通过观测数据,用马尔科夫链蒙特卡洛方法来约束模型参数。
关键词: 粒子加速:MHD:等离子体:激波:湍流
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