On Particle Acceleration around Shocks. II. A Fully General Method for Arbitrary Shock Velocities and Scattering Media
On Particle Acceleration around Shocks. II. A Fully General Method for Arbitrary Shock Velocities and Scattering Media
复制标题
关于冲击周围的粒子加速。
DOI：
10.1086/430164
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
M. Vietri
中科院分区：
文献类型：
--
作者：
P. Blasi;M. Vietri
在测试粒子极限中，粒子沿给定方向穿过激波后，沿另一个方向反向反射的概率，被证明是确定通过费米机制在平面平行激波周围加速的非热粒子谱的关键因素。这里给出了上游和下游部分的概率分布的显式方程。虽然难以解析，但这个方程是数值求解的，允许在完全一般的情况下确定光谱，而不限于激波速度或散射特性。然后计算了许多情况，与以前的数值工作联系起来，在所有制度下：牛顿，超相对论和完全相对论。
The probability that a particle, crossing the shock along a given direction, is reflected backward along another direction was shown to be the key element in determining the spectrum of nonthermal particles accelerated via the Fermi mechanism around a plane-parallel shock in the test-particle limit. Here an explicit equation for this probability distribution is given for both the upstream and downstream sections. Although analytically intractable, this equation is solved numerically, allowing the determination of the spectrum in full generality, without limitation to shock speed or scattering properties. A number of cases are then computed, making contact with previous numerical work, in all regimes: Newtonian, transrelativistic, and fully relativistic.