Evolution of the radio spectrum of Cassiopeia A
Evolution of the radio spectrum of Cassiopeia A
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仙后座 A 无线电频谱的演变
DOI：
10.1086/156795
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发表时间：
1979
期刊：
影响因子：
--
通讯作者：
R. Cowsik
中科院分区：
文献类型：
--
作者：
R. Cowsik
研究了二阶费米随机加速作用下粒子谱的演化，给出了控制粒子布居的微分方程的封闭形式的显式解.该解显示出一个非常迷人的性质，即频谱逐渐向能量的幂律方向移动。用这个解研究了仙后座A的非热射电谱的演化，结果表明，这个解很好地解释了仙后座A的谱及其长期衰变。
The evolution of the spectrum of particles subjected to stochastic second-order Fermi acceleration is studied, and an explicit solution of the differential equation controlling the particle population is presented in a closed form. The solution exhibits a very fascinating property in that the spectrum progressively flattens toward a power law in energy. This solution is used to study the evolution of the nonthermal radio spectrum of Cassiopeia A, and it is shown that the spectrum and its secular decay are well explained by the present model.