Cosmogenic gamma-rays and neutrinos constrain UHECR source models
Cosmogenic gamma-rays and neutrinos constrain UHECR source models
复制标题
宇宙伽马射线和中微子限制了 UHECR 源模型
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
R. A. Batista
中科院分区：
文献类型：
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作者：
A. V. Vliet;J. Horandel;R. A. Batista
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）在其源处的最大能量，注入时的光谱指数和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，与灵敏度的实验，以单味中微子通量在$\sim 10^{-8}$ - $10^{-10}$ GeV cm$^{-2}$ s$^{-1}$ sr$^{-1}$，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。
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.