arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0908.3369astro-ph.HE
收藏

作为超新星遗迹激波下游区域电荷交换结果的等离子体不稳定性

Plasma instabilities as a result of charge exchange in the downstream region of supernova remnant shocks

Yutaka Ohira, Toshio Terasawa, Fumio Takahara

摘要:

超新星遗迹(SNRs)的H-α辐射意味着星周介质中存在中性氢。一些穿过激波的中性粒子通过电荷交换过程被电离,在激波下游形成冷离子束。我们进行线性分析之间的冷束和热下游等离子体的无碰撞等离子体不稳定性。我们发现,在典型的信噪比条件下,无论是共振不稳定性或韦伯不稳定性是最不稳定的。这种机制可以将磁场放大到100微G以上,并改变激波结构。因此,除了广泛讨论的贝尔机制外,射电频谱和大磁场也可以得到解释。

英文摘要:

H-alpha emission from supernova remnants (SNRs) implies the existence of neutral hydrogen in the circumstellar medium. Some of the neutral particles penetrating the shock are ionized by the charge exchange process and make a cold ion beam in the shock downstream region. We perform linear analyses of collisionless plasma instabilities between the cold beam and the hot downstream plasma. We find that, under typical SNR conditions, either the resonant instability or the Weibel instability is the most unstable. This mechanism may amplify the magnetic field to more than 100 micro G and changes the shock structure. As a result, the radio spectrum and the large magnetic field can be explained, apart from the widely discussed Bell's mechanism.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑