论文标题
由于超高能量宇宙射线传播，来自伽马射线的PEV-EEV中微子来自Gamma-ray Blazars
PeV-EeV neutrinos from gamma-ray blazars due to ultrahigh-energy cosmic-ray propagation
论文作者
论文摘要
大麻是宇宙射线加速度的潜在候选者，直到超高能量（$ e \ gtrsim10^{18} $ ev）。对于从Blazars进行有效的宇宙射线注入，$Pγ$与乳清外背景光（EBL）和宇宙微波背景（CMB）的碰撞分别可以在PEV和EEV能量附近产生中微子光谱峰。我们分析了这些中微子对由Icecube中微子观测值测量的弥漫背景的贡献。源自单个红移范围的中微子光度的分数是使用\ textIt {fermi} -lat 4LAC目录中提供的Bl lac和FSRQ的分布来计算的。此外，我们使用光度依赖性密度演变来从未解决的诸如大麻中找到中微子通量。在我们的模型中获得的结果表明，在几个PEV能量处的通量上限的$ \％$ $ \％$可能来自EBL上的宇宙射线相互作用。相同的相互作用还将产生二级电子和光子，从而启动电磁级联反应。所得的光子光谱受到各向同性弥漫性$γ$ ray通量的限制，在100 meV和820 GEV之间测得。后者以及观察到的宇宙射线通量在$ e> 10^{16.5} $ eV时，可以根据最大宇宙射线加速能的不同来限制重型载荷因子。
Blazars are potential candidates of cosmic-ray acceleration up to ultrahigh energies ($E\gtrsim10^{18}$ eV). For an efficient cosmic-ray injection from blazars, $pγ$ collisions with the extragalactic background light (EBL) and cosmic microwave background (CMB) can produce neutrino spectrum peaks near PeV and EeV energies, respectively. We analyze the contribution of these neutrinos to the diffuse background measured by the IceCube neutrino observatory. The fraction of neutrino luminosity originating from individual redshift ranges is calculated using the distribution of BL Lacs and FSRQs provided in the \textit{Fermi}-LAT 4LAC catalog. Furthermore, we use a luminosity dependent density evolution to find the neutrino flux from unresolved blazars. The results obtained in our model indicate that as much as $\approx10\%$ of the flux upper bound at a few PeV energies can arise from cosmic-ray interactions on EBL. The same interactions will also produce secondary electrons and photons, initiating electromagnetic cascades. The resultant photon spectrum is limited by the isotropic diffuse $γ$-ray flux measured between 100 MeV and 820 GeV. The latter, together with the observed cosmic-ray flux at $E>10^{16.5}$ eV, can constrain the baryonic loading factor depending on the maximum cosmic-ray acceleration energy.
