Electron Heating at SNR Collisionless Shocks

Electron Heating at SNR Collisionless Shocks
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SNR 无碰撞冲击下的电子加热

DOI:
10.1086/313325
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发表时间:
2000
期刊:
The Astrophysical Journal Supplement Series
影响因子:
--
通讯作者:
J. Laming
J. Laming
中科院分区:
--
文献类型:
--
作者:
J. Laming

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超新星遗迹中的热气体被无碰撞激波加热,通常在低密度(∼1原子厘米-3介质)中传播,激波相变发生的长度比典型的粒子到库仑碰撞的平均自由路径要短得多。能量守恒定律、动量守恒定律和激波粒子数守恒定律预测了震后粒子温度与它们的质量成正比,即电子温度和离子温度。当然,电子和离子会通过库仑碰撞来平衡,但无碰撞的过程可能会带来更快的平衡。我回顾了关于这一重要观点的理论和观察工作,并推测了存在差异的原因。
The hot gas in supernova remnants is heated by collisionless shocks, generally propagating in low density (∼ 1 atom cm-3 media), where the shock transition occurs on a length scale much shorter than the typical particle mean free path to Coulomb collisions. Conservation laws for energy, momentum, and particle numbers across the shock predict postshock particle temperatures proportional to their masses, that is, electron temperature ≪ ion temperature. Electrons and ions will, of course, equilibrate by Coulomb collisions, but collisionless processes might bring about faster equilibration. I review theoretical and observational work on this important point and speculate on reasons for discrepancies where they exist.
超新星遗迹中巴尔默主导激波的高分辨率 H-α 能谱
DOI: --
发表时间: 2017
期刊:
影响因子: --
作者:
Katsuda;Satoru; Maeda;Keiichi; Ohira;Yutaka; et al.
通讯作者: Yutaka; et al.