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arXiv 0908.3217astro-ph.HE
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原子核电离产生的Cosmic-ray电子注入

Cosmic-ray electron injection from the ionization of nuclei

G. Morlino

摘要:

我们表明,从重离子电离中喷射出的次级电子可以被注入到超新星遗迹冲击中发生的加速过程中。这种电子注入机制的工作原理是,当离子已经以相对论速度移动时,离子在加速过程中被电离,就像射出的电子一样。利用在地球上测量到的宇宙射线中重核的丰度,我们估计源处的电子/质子比约为10^-4,这足以解释在年轻的超新星中观测到的非热同步辐射。我们还表明,电离过程可以限制重离子可以达到的最大能量。

英文摘要:

We show that the secondary electrons ejected from the ionization of heavy ions can be injected into the acceleration process that occurs at supernova remnant shocks. This electron injection mechanism works since ions are ionized during the acceleration when they move already with relativistic speed, just like ejected electrons do. Using the abundances of heavy nuclei measured in cosmic rays at Earth, we estimate the electron/proton ratio at the source to be ~10^-4, big enough to account for the nonthermal synchrotron emission observed in young SNRs. We also show that the ionization process can limit the maximum energy that heavy ions can reach.

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