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arXiv 1312.7616astro-ph.HE
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用弥散的PeV γ射线和中微子精确定位宇宙射线的膝关节

Pinpointing the knee of cosmic rays with diffuse PeV gamma-rays and neutrinos

Y. Q. Guo, H. B. Hu, Q. Yuan, Z. Tian, X. J. Gao

摘要:

宇宙线谱中膝的起源是一个尚未解决的基本问题。对于不同的破断位置和膝关节的组成,有各种各样的预测模型。在这项工作中,我们建议使用扩散$γ$ -射线和中微子作为探针来测试这些模型。基于几种典型的组分模型,计算了扩散$γ$射线谱和中微子谱,它们在几十TeV到几PeV的能量范围内表现出不同的截止行为.预期的通量将通过新升级的Tibet-AS $γ$ +MD(μ子探测器)实验以及更敏感的未来项目(如LHAASO和HiSCORE)进行观测。通过比较中微子能谱与冰立方实验的观测结果,我们发现,来自宇宙射线与星际介质相互作用的散射中微子可能不是冰立方事件的主要原因。未来对中微子的测量可能能够识别银河系扩散成分,并进一步阐明宇宙射线的膝盖问题。

英文摘要:

The origin of the knee in cosmic ray spectrum remains to be an unsolved fundamental problem. There are various kinds of models which predict different break positions and the compositions of the knee. In this work, we suggest to use diffuse $γ$-rays and neutrinos as probes to test these models. Based on several typical types of the composition models, the diffuse $γ$-ray and neutrino spectra are calculated, which show distinctive cutoff behaviours at energies from tens of TeV to multi-PeV. The expected flux will be observable by the newly upgraded Tibet-AS$γ$+MD (muon detector) experiment as well as more sensitive future projects, such as LHAASO and HiSCORE. By comparing the neutrino spectrum with the recent observations by IceCube experiment, we find that the diffuse neutrinos from interactions between the cosmic rays and the interstellar medium may not be responsible to the majority of the IceCube events. Future measurements of the neutrinos may be able to identify the Galactic diffuse component and further shed light on the problem of the knee of cosmic rays.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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