Cosmic ray electron spectrum due to the dispersion ofinjection spectrum

Tian-Lu Chen; Wei Liu; Qi Gao; Mao-Yuan Liu; Hai-Jin Li; Danzengluobu; Ying Shi

doi:10.1088/1674-1137/42/7/075001

Chinese Physics C> 2018, Vol. 42> Issue(7) : 075001 DOI: 10.1088/1674-1137/42/7/075001

Cosmic ray electron spectrum due to the dispersion ofinjection spectrum

Tian-Lu Chen ^1,2,3 ,
Wei Liu ⁴ ,
Qi Gao ^2,3 ,
Mao-Yuan Liu ^2,3 ,
Hai-Jin Li ^2,3 ,
Danzengluobu ^2,3 ,
Ying Shi ¹

1.
School of Physics and Technology, Wuhan University, Wuhan 430072, China
2.
Physics Department of the Science School, Tibet University, Lhasa 850000, China
3.
Key Laboratory of Cosmic Rays(Tibet University), Ministry of Education, Lhasa 850000, China
4.
Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
5.
Physics Department of the Science School, Tibet University, Lhasa 850000, China
6.
Key Laboratory of Cosmic Rays(Tibet University), Ministry of Education, Lhasa 850000, China
7.
School of Physics and Technology, Wuhan University, Wuhan 430072, China

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Abstract：
The cosmic-ray total electron spectrum (electrons plus positrons) has been measured precisely up to TeV energies, with more interesting features found. Exhaustive analyses of the electron spectrum strongly support a spectral hardening above 100 GeV, rather than a featureless single power-law, which is confirmed by the most recent observations. Meanwhile, the measurements of the DAMPE satellite have verified the presence of a knee-like structure around 1 TeV in the electron spectrum, resembling the cosmic-ray knee. In this paper, we establish a physical model in which the observed electron spectrum is composed of a superposition of CR sources with various spectral indices and high-energy cutoffs. The dispersion of the power index is assumed to be Gaussian, while the cutoff energy E_c follows a power-law distribution. These simple ideas can account naturally for both the hundred-GeV excess and the TeV spectral break.
- electron ,
- spectrum ,
- cosmic rays ,
- source ,
- DAMPE

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Tian-Lu Chen, Wei Liu, Qi Gao, Mao-Yuan Liu, Hai-Jin Li, Danzengluobu and Ying Shi. Cosmic ray electron spectrum due to the dispersion ofinjection spectrum[J]. Chinese Physics C, 2018, 42(7): 075001. doi: 10.1088/1674-1137/42/7/075001

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Received: 2018-03-22

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Supported by National Natural Sciences Foundation of China (11663006, 11747316, 11135010, 11405182) and the Research Project of Chinese Ministry of Education (213036A)

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沈阳化工大学材料科学与工程学院沈阳 110142

Cosmic ray electron spectrum due to the dispersion ofinjection spectrum

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