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On the contribution of a hard galactic plane component to the excesses of secondary particles
Guo YQ(郭义庆); Hu HB(胡红波); Tian Z(田珍); Guo, YQ; Hu, HB; Tian, Z
2016
发表期刊CHINESE PHYSICS C
卷号40期号:11
通讯作者郭义庆
文章类型Article
摘要The standard model of cosmic ray propagation has been very successful in explaining all kinds of galactic cosmic ray spectra. However, high precision measurement have recently revealed an appreciable discrepancy between data and model expectations, from spectrum observations of gamma-rays, e(+)/e(-) and probably the B/C ratio starting from similar to 10 GeV energy. In this work, we propose that a hard galactic plane component, supplied by the fresh cosmic ray sources and detained by local magnetic fields, can contribute additional secondary particles interacting with local materials. By properly choosing the intensity and spectral index of the harder component up to multi-TeV energy, a two-component gamma-ray spectrum is obtained and agrees very well with the observation. Simultaneously, the expected neutrino numbers from the galactic plane could contribute similar to 60% of IceCube observed neutrino number below a few hundreds of TeV under our model. In addition to these studies, we find that the same pp-collision process responsible for the excess gamma ray emission could account for a significant amount of the positron excess, but a more detailed mechanism is needed for a full agreement. It is expected that the excesses in the (p) over bar /p and B/C ratio will show up when energy is above similar to 10 GeV. We look forward this model being tested in the near future by new observations from AMS02, IceCube, AS gamma, HAWC and future experiments such as LHASSO, HiSCORE and CTA.
关键词cosmic ray gamma ray neutrino
DOI10.1088/1674-1137/40/11/115001
关键词[WOS]GAMMA-RAY EMISSION ; NEAR-EARTH ORBIT ; COSMIC-RAYS ; ENERGY-SPECTRA ; HELIUM SPECTRA ; INTERSTELLAR-MEDIUM ; CHARGE COMPOSITION ; PEV NEUTRINOS ; SHOCK FRONTS ; NUCLEI
语种英语
WOS记录号WOS:000389144400015
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/260810
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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Guo YQ,Hu HB,Tian Z,et al. On the contribution of a hard galactic plane component to the excesses of secondary particles[J]. CHINESE PHYSICS C,2016,40(11).
APA 郭义庆,胡红波,田珍,Guo, YQ,Hu, HB,&Tian, Z.(2016).On the contribution of a hard galactic plane component to the excesses of secondary particles.CHINESE PHYSICS C,40(11).
MLA 郭义庆,et al."On the contribution of a hard galactic plane component to the excesses of secondary particles".CHINESE PHYSICS C 40.11(2016).
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