SNR RX J1713.7-3946中的随机电子加速.docVIP

  SNR RX J1713.7-3946中的随机电子加速 范忠辉1，刘四明2 1 云南大学物理科学技术学院，昆明　650091 2 中国科学院紫金山天文台，南京　210008 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 中图分类号： P142.6 Stochastic Electron Acceleration in SNR RX J1713.7-3946 Fan Zhonghui1, Liu Siming2 1 Department of Physics, University of Yunnang, Kunming 510091 2 Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 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 di?usion 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 di?usion coe?cients. 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. Key words: acceleration of particles: MHD: plasmas: shock waves: turbulence 基金项目： National Science Foundation of China Foundation 1114307, and SRFDP of China (20095301120006) 作者简介： Fan Zhonghui（1973-），male，associate professor，major research direction：acceleration of par- ticles in astrophysics. Correspondence author：Liu Siming（1973-），male，professor，major research direction： acceleration of particles in astrophysics. -2- 1   0  Introduction  Observations of high-energy emission from many astrophysical sources imply the presence of signi?cant populations of relativistic particles. Relativistic cosmic rays (CRs) with