First-order Fermi acceleration at oblique relativistic magnetohydrodynamic shocks
First-order Fermi acceleration at oblique relativistic magnetohydrodynamic shocks
复制标题
倾斜相对论磁流体动力冲击下的一阶费米加速度
DOI：
10.1093/mnras/251.3.438
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
A. Heavens
中科院分区：
文献类型：
--
作者：
K. Ballard;A. Heavens
本文研究了斜相对论磁流体激波前沿的一阶费米加速度。激波处的跳跃条件用完全相对论状态方程求解，并考虑了各种可能的下游条件。在得到跳跃条件的解后，利用Monte Carlo模拟和Kirk & Heavens的半解析理论两种方法，得到了激波前沿通过一阶费米机制加速的电子的谱指数。在假定磁场的不规则性很小的情况下，发现了很好的一致性。我们发现，除非alfv<s:1>马赫数不大于1，否则斜相对论MHD激波的同步辐射谱指数预计在0到0.5之间。
In this paper we investigate first-order Fermi acceleration at oblique relativistic magnetohydrodynamic (MHD) shock fronts. The jump conditions at the shock are solved using a full relativistic equation of state and allowing for various possible downstream conditions. Having obtained solutions to the jump conditions, the spectral indices of electrons accelerated by the shock front through the first-order Fermi mechanism are obtained by employing two methods: a Monte Carlo simulation and the semi-analytic theory of Kirk & Heavens. Good agreement is found for the case where irregularities in the magnetic field are assumed to be small. We find that synchrotron spectral indices in the range of 0 to 0.5 are expected for oblique relativistic MHD shocks, unless the Alfvén Mach number is not much greater than unity.