磁化喷流的正反激波动力学

Forward-Reverse Shock Dynamics of the Magnetized Jet

摘要:

伽玛射线暴是宇宙中最剧烈的伽玛射线爆发现象之一. 由物质主导的激波过程已经被广泛的研究过. 观测表明，伽玛射线暴爆发时所产生的喷流可能是磁化的，磁化喷流与星际介质相互作用产生的正反激波和以纯物质主导的喷流情形有很大不同. 对比Zhang 和Kobayashi 在理想磁流体力学条件下给出了正反激波的解析解，本文推导了磁化喷流正反激波的一般动力学方程，并对一些关键参数作了数值求解.

Abstract:

Gamma-ray burst (GRB) is one of the most explosive phenomena in the universe, the mass dominated dynamics of both forward and reverse shock evolution process is already well studied. Observations indicate that the jet from GRB may be magnetized, and the dynamics of the forward-reverse shocks produced by interactions between the jet and the interstellar medium will have new features once the jet was magnetized. Zhang & Kobayashi had derived a analytic solution of the dynamics based on the ideal MHD condition. This article derives a set of general dynamics equations with some related numerical calculations.