Cosmic-ray acceleration and escape from supernova remnants
Cosmic-ray acceleration and escape from supernova remnants
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DOI：
10.1093/mnras/stt179
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发表时间：
2013-05-01
影响因子：
4.8
通讯作者：
Giacinti, G.
中科院分区：
文献类型：
--
作者：
Bell, A. R.;Schure, K. M.;Giacinti, G.
只有当超新星遗迹（SNR）冲击之前的磁场被逃离SNR的宇宙射线（CR）强烈放大时，银河宇宙射线（CR）才可能以几PeV的速度加速到光谱中的膝盖。一个模型制定的逃逸CR携带的电荷预测CR的最大能量和CR释放到周围介质中的能谱。我们发现，历史上的信噪比，如Cas A，第谷和开普勒可能是扩大太慢，以加速CR膝盖在目前的时间。
Galactic cosmic-ray (CR) acceleration to the knee in the spectrum at a few PeV is only possible if the magnetic field ahead of a supernova remnant (SNR) shock is strongly amplified by CRs escaping the SNR. A model formulated in terms of the electric charge carried by escaping CRs predicts the maximum CR energy and the energy spectrum of CRs released into the surrounding medium. We find that historical SNRs such as Cas A, Tycho and Kepler may be expanding too slowly to accelerate CRs to the knee at the present time.