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arXiv 1707.04511astro-ph.HE
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宇宙成因γ射线和中微子对UHECR源模型的约束

Cosmogenic gamma-rays and neutrinos constrain UHECR source models

Arjen van Vliet, Jörg R. Hörandel, Rafael Alves Batista

摘要:

我们使用CRPropa 3来展示预期的宇宙成因中微子和伽马射线光谱如何取决于超高能宇宙射线(UHECR)在其源的最大能量,在注入的光谱指数和UHECR的化学成分。费米/LAT测量的各向同性漫射伽马射线背景已经接近接触到一个模型,该模型具有共同移动的源演化,并具有优化的化学成分,光谱指数和最大加速能量,以提供最佳拟合的UHECR光谱和皮埃尔俄歇合作测量的组成。此外,在UHECR的最高能量的质子存在的可检测的分数,实验的灵敏度在$\sim 10^{-8}$ - $10^{-10}$ GeV cm $^{-2}$ s $^{-1}$ sr $^{-1}$的范围内的$\sim1$ EeV的单味中微子通量,显示为UHECR源的演变的函数。达到这种灵敏度的实验将能够显着约束现实源演化模型的质子分数。

英文摘要:

We use CRPropa 3 to show how the expected cosmogenic neutrino and gamma-ray spectra depend on the maximum energy of ultra-high energy cosmic rays (UHECRs) at their sources, on the spectral index at injection and on the chemical composition of UHECRs. The isotropic diffuse gamma-ray background measured by Fermi/LAT is already close to touching upon a model with co-moving source evolution and with the chemical composition, spectral index and maximum acceleration energy optimized to provide the best fit to the UHECR spectrum and composition measured by the Pierre Auger Collaboration. Additionally, the detectable fraction of protons present at the highest energies in UHECRs, for experiments with sensitivities to the single-flavor neutrino flux at $\sim1$ EeV in the range of $\sim 10^{-8}$ - $10^{-10}$ GeV cm$^{-2}$ s$^{-1}$ sr$^{-1}$, is shown as a function of the evolution of UHECR sources. Experiments that reach this sensitivity will be able to significantly constrain the proton fraction for realistic source evolution models.

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