CHEMICAL COMPOSITION AND MAXIMUM ENERGY OF GALACTIC COSMIC RAYS
CHEMICAL COMPOSITION AND MAXIMUM ENERGY OF GALACTIC COSMIC RAYS
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DOI：
10.1088/0004-637x/716/2/1076
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发表时间：
2010-06
期刊：
影响因子：
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通讯作者：
M. Shibata;Y. Katayose;J. Huang;D. Chen
中科院分区：
文献类型：
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作者：
M. Shibata;Y. Katayose;J. Huang;D. Chen
提出了一个宇宙射线能谱模型，该模型假设了多个源的各种加速度极限。该模型描述了宇宙射线的多源叠加打破幂律能谱;扩散冲击加速机制起着至关重要的作用。银河宇宙线的最大能量进行了讨论的基础上进行的计算与实验数据的比较，使用所提出的模型。该模型可以描述能量高达1018 eV数倍的非常高能量的能谱，但观测到的最高能量宇宙射线偏离了模型的预测，表明不同的起源，例如河外源。该模型描述了在所谓的拐点处功率指数的陡峭化。然而，发现需要额外的假设来解释膝关节的锋利度。膝结构的两种可能的解释进行了讨论，在附近的源（S）和硬能谱建议的非线性效应的宇宙线加速机制。
A model of the cosmic-ray energy spectrum is proposed that assumes various acceleration limits at multiple sources. The model describes the broken power-law energy spectrum of cosmic rays by superposition of multiple sources; a diffusive shock acceleration mechanism plays an essential role. The maximum energy of galactic cosmic rays is discussed based on a comparison of experimental data with calculations done using the proposed model. The model can describe the energy spectrum at very high energies of up to several times 1018 eV, but the observed highest-energy cosmic rays deviate from the model predictions, indicating a different origin, such as an extragalactic source. This model describes the steepening of the power index at the so-called knee. However, it was found that additional assumptions are needed to explain the sharpness of the knee. Two possible explanations for the structure of the knee are discussed in terms of nearby source(s) and the hard energy spectrum suggested by nonlinear effects of cosmic-ray acceleration mechanisms.