宇宙成因中微子最大通量的Gamma-Ray约束和UHECR源演化模型
Gamma-Ray Constraints on Maximum Cosmogenic Neutrino Fluxes and UHECR Source Evolution Models
摘要：
倾角模型假设10 $^{18}$ eV以上的超高能宇宙射线（UHECR）仅由质子组成，并且与HiRes测量的光谱和成分一致。在这里，我们提出的宇宙成因中微子通量的范围内的倾角模型，这是兼容的河外甚高能量（VHE）的伽马射线扩散背景来自2.5年的费米/LAT数据的最近确定。我们表明，在倾角模型预测的最大通量将检测IceCube在约10年的观测和ARA项目的几年的观测范围内。在不完全的UHECR模型中，质子被假定只在10 $^{19}$ eV以上占主导地位，宇宙成因中微子通量可能是2或3倍。在这些能量下，UHECR中任何一部分较重的核都会减少最大宇宙成因中微子通量。我们还考虑了特殊的演化模型，其中UHECR源被假定为具有相同的演化，无论是恒星形成率（SFR），或伽马射线暴（GRB）率，或在宇宙中的活动星系核（AGN）率，并发现后两个是不利的（和在倾角模型拒绝）由新的VHE伽玛射线背景。
英文摘要：
The dip model assumes that the ultra-high energy cosmic rays (UHECRs) above 10$^{18}$ eV consist exclusively of protons and is consistent with the spectrum and composition measure by HiRes. Here we present the range of cosmogenic neutrino fluxes in the dip-model which are compatible with a recent determination of the extragalactic very high energy (VHE) gamma-ray diffuse background derived from 2.5 years of Fermi/LAT data. We show that the largest fluxes predicted in the dip model would be detectable by IceCube in about 10 years of observation and are within the reach of a few years of observation with the ARA project. In the incomplete UHECR model in which protons are assumed to dominate only above 10$^{19}$ eV, the cosmogenic neutrino fluxes could be a factor of 2 or 3 larger. Any fraction of heavier nuclei in the UHECR at these energies would reduce the maximum cosmogenic neutrino fluxes. We also consider here special evolution models in which the UHECR sources are assumed to have the same evolution of either the star formation rate (SFR), or the gamma-ray burst (GRB) rate, or the active galactic nuclei (AGN) rate in the Universe and found that the last two are disfavored (and in the dip model rejected) by the new VHE gamma-ray background.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
