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Impact of Fermi-LAT and AMS-02 results on cosmic-ray astrophysics

机译:Fermi-LAT和AMS-02结果对宇宙射线天体物理学的影响

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This article reviews a few topics relevant to Galactic cosmic-ray astrophysics, focusing on the recent AMS-02 data release and Fermi Large Area Telescope data on the diffuse Galactic γ-ray emissivity. Calculations are made of the diffuse cosmic-ray induced p + p → π0 → 2γ spectra, normalized to the AMS-02 cosmic-ray proton spectrum at ≈ 10 ? 100?GV, with and without a hardening in the cosmic-ray proton spectrum at rigidities R300?GV. A single power-law momentum “shock” spectrum for the local interstellar medium cosmic-ray proton spectrum cannot be ruled out from the γ-ray emissivity data alone without considering the additional contribution of electron bremsstrahlung. Metallicity corrections are discussed, and a maximal range of nuclear enhancement factors from 1.52 to 1.92 is estimated. Origins of the 300?GV cosmic-ray proton and α-particle hardening are discussed.
机译:本文回顾了与银河系宇宙射线天体物理学有关的一些主题,重点介绍了最近的AMS-02数据发布和有关弥散银河系γ射线发射率的费米大面积望远镜数据。计算由弥散宇宙射线引起的p + p→π0→2γ光谱,并归一化为AMS-02宇宙射线质子光谱,其≈10? 100?GV,刚度为R300?GV时,宇宙射线质子光谱有无硬化。如果不考虑电子致辐射的其他贡献,就不能仅从γ射线发射率数据中排除局部星际介质宇宙射线质子谱的单个幂律动量“冲击”谱。讨论了金属校正,估计的核增强因子最大范围为1.52至1.92。讨论了300?GV宇宙射线质子和α粒子硬化的起源。

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