Constraining photohadronic scenarios for the unified origin of IceCube neutrinos and ultrahigh-energy cosmic rays
Constraining photohadronic scenarios for the unified origin of IceCube neutrinos and ultrahigh-energy cosmic rays
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DOI：
10.1103/physrevd.102.083023
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发表时间：
2020-07
影响因子：
5
通讯作者：
S. Yoshida;K. Murase
中科院分区：
文献类型：
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作者：
S. Yoshida;K. Murase
在冰立方中测量的扩散中微子通量与超高能宇宙射线（UHECR）通量相当，这导致了高能中微子和UHECR背景的统一起源的概念。我们构建了一个通用的统一模型的源来解释UHECR数据在$\gtrsim 10^{19}$ eV，和高能中微子的能量超过$\sim100$ TeV的框架中的光介子生产过程，并提供一般的约束源的属性。为了加速宇宙射线到100万亿电子伏的能量，必须实现一个具有适度有效的原位产生光学深度为0.1\lesssim \tau_{p\gamma}\lesssim 0.6$的$\gtrsim 100$ TeV中微子的源环境。宇宙射线和中微子的测量通量为源的光度和速率密度设定了一个界限。虽然这些结果具有一定的普遍性，且适用于未知源总体，但在所提出的候选源中，只要适当选择等离子体外流的洛伦兹体积因子以及宇宙线和磁场的均分参数，低亮度伽玛暴（GRB）和潮汐破裂事件（TDEs）都可以满足要求。
The diffuse neutrino flux measured in IceCube is comparable with the ultrahigh-energy cosmic ray (UHECR) flux, which has led to the concept of a unified origin of high-energy neutrino and UHECR backgrounds. We construct a generic unification model of sources to explain UHECR data at $\gtrsim 10^{19}$ eV, and high-energy neutrinos with energies that exceed $\sim100$ TeV in the framework of photo-meson production processes, and provide general constraints on the source properties. A source environment with moderately efficient in-situ production of $\gtrsim 100$ TeV neutrinos with an optical depth of $0.1 \lesssim \tau_{p\gamma}\lesssim 0.6$ must be realized to accelerate cosmic rays to ultrahigh energies. The measured fluxes of cosmic rays and neutrinos set a bound on the source luminosity and its rate density. Although the results are rather general and applicable to unknown source population, among the proposed source candidates, low-luminosity gamma-ray bursts (GRBs) and tidal disruption events (TDEs) could satisfy the requirements if the Lorentz bulk factor of plasma outflow and the equipartition parameters for cosmic rays and magnetic field are appropriately selected.