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arXiv 2403.13482astro-ph.HE
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从已知到未知:宇宙线从太阳、银河系到银河系外的跃迁

From known to unknown: cosmic rays transition from the Sun, the Galaxy, and the Extra-Galaxy

Yu-Hua Yao, Yi-Qing Guo, Wei Liu

AI总结:

本研究分析了 MeV 到 10 EeV 能量范围内的宇宙线能谱与质量成分,发现平均对数质量分布比能谱展现出更清晰的特征结构,揭示了 100 TeV 凸起、质子膝位置及银河系内外边界,并指出附近星系对全粒子能谱硬化的贡献,期待 LHAASO 实验验证这些结果。

摘要:

太阳是最近且最清晰的宇宙线天体物理加速器,而银河系内及银河系外的其他天体仍然神秘。来自这些天体的宇宙线能谱和质量成分可能具有相似性,为研究其起源提供了一种新方法。在本研究中,我们分析了 MeV 到 10 EeV 能量范围内的能谱和质量。我们发现:(1)平均对数质量 $\rm\left\langle lnA \right\rangle$ 随能量分布的图景比能谱展现出更清晰的特征结构;(2)在 $\rm\left\langle lnA \right\rangle$ 分布中存在一个 100 TeV 的凸起;(3)对于质子,膝位于约 2 PeV 处,银河系与银河系外的边界位于约 30 PeV 处,以一个尖锐的凹陷为标志;(4)由于附近星系的贡献,全粒子能谱在约 30 PeV 处表现出硬化,银河系外成分在约 0.7 EeV 处占据主导地位。我们希望 LHAASO 实验能够对各个种类进行能谱测量,以验证我们的结果。

英文摘要:

The Sun stands out as the closest and clearest astrophysical accelerator of cosmic rays, while other objects within and beyond the galaxy remain enigmatic. It is probable that the cosmic ray spectrum and mass components from these celestial sources share similarities, offering a novel approach to study their origin. In this study, we analyze of spectra and mass in the energy range from MeV to 10~EeV. We find: (1) the mean-logarithmic mass $\rm\left\langle lnA \right\rangle$ distribution with energy exhibits much clearer feature structures than the spectra; (2) a 100~TeV bump is presented in the $\rm\left\langle lnA \right\rangle$ distribution; (3) for protons, the knee is located at $\sim2$ PeV, the boundary between the galaxy and extra-galaxy occurs at $\sim30$ PeV, marked by a sharp dip; (4) the all-particle spectrum exhibits hardening at $\sim30$~PeV due to the contribution of nearby galaxies, and the extra-galactic dominate $\sim0.7$~EeV. We hope the LHAASO experiment can perform spectral measurements of individual species to validate our results.

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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