Explanation of the knee-like feature in the dampe cosmic energy spectrum
文献类型：期刊论文
| 作者 | Fang,Kun1,2; Bi,Xiao-Jun1,2; Yin,Peng-Fei1 |
| 刊名 | The astrophysical journal
 |
| 出版日期 | 2018-02-12 |
| 卷号 | 854期号:1 |
| ISSN号 | 0004-637X |
| 关键词 | Cosmic rays Ism: supernova remnants Pulsars: general |
| DOI | 10.3847/1538-4357/aaa710 |
| 英文摘要 | Abstract the dark matter particle explorer, a space-based high precision cosmic-ray detector, has just reported the new measurement of the total electron plus positron energy spectrum up to 4.6 tev. a notable feature in the spectrum is the spectral break at ～0.9 tev, with the spectral index softening from ?3.1 to ?3.9. such a feature is very similar to the knee at the cosmic nuclei energy spectrum. in this work, we propose that the knee-like feature can be explained naturally by assuming that the electrons are accelerated at the supernova remnants (snrs) and released when the snrs die out with lifetimes around 105 years. the cut-off energy of those electrons have already decreased to several tev due to radiative cooling, which may induce the observed tev spectral break. another possibility is that the break is induced by a single nearby old snr. such a scenario may bring a large electron flux anisotropy that may be observable by the future detectors. we also show that a minor part of electrons escaping during the acceleration in young and nearby snrs is able to contribute to a several tev or higher energy region of the spectrum. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-854-1-AAA710 |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2175751 |
| 专题 | 高能物理研究所 |
| 作者单位 | 1.Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China 2.School of Physics, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Fang,Kun,Bi,Xiao-Jun,Yin,Peng-Fei. Explanation of the knee-like feature in the dampe cosmic energy spectrum[J]. The astrophysical journal,2018,854(1). |
| APA | Fang,Kun,Bi,Xiao-Jun,&Yin,Peng-Fei.(2018).Explanation of the knee-like feature in the dampe cosmic energy spectrum.The astrophysical journal,854(1). |
| MLA | Fang,Kun,et al."Explanation of the knee-like feature in the dampe cosmic energy spectrum".The astrophysical journal 854.1(2018). |
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来源：高能物理研究所
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