The origin of the astrophysical neutrino flux reported by the IceCube Collaboration remains an open question. In this study, we use three years of publicly available IceCube data to search for evidence of neutrino emission from the blazars and non-blazar Active Galactic Nuclei (AGN) contained the Fermi 4LAC catalog. We find no evidence that these sources produce high-energy neutrinos, and conclude that blazars can produce no more than 15% of IceCube's observed flux. The constraint we derive on the contribution from non-blazar AGN, which are less luminous and more numerous than blazars, is significantly less restrictive, and it remains possible that this class of sources could produce the entirety of the diffuse neutrino flux observed by IceCube. With our non-blazar AGN constraints approaching IceCube's reported astrophysical neutrino flux, we anticipate that it will become possible to definitively test such scenarios as IceCube accumulates and releases more data, and as gamma-ray catalogs of AGN become increasingly complete. We also comment on starburst and other starforming galaxies, and conclude that these sources could contribute substantially to the signal observed by IceCube, in particular at the lowest detected energies.

IceCube合作组织报告的天体中微子通量的起源仍然是一个悬而未决的问题。在这项研究中，我们使用了三年公开可用的IceCube数据来搜索blazar中的中微子排放证据，而非blazar Active Galactic Nuclei（AGN）包含Fermi 4LAC目录。我们没有发现这些来源会产生高能中微子的证据，并得出结论说，易碎物质产生的冰量不超过IceCube观测到的通量的15％。我们对非爆发性AGN贡献的约束受到限制，非爆发性AGN的发光量小于爆发性AGN，并且限制远不那么严格，并且此类来源仍然可能产生IceCube观测到的整个弥散中微子通量。由于我们的非无爆炸性AGN约束接近IceCube报告的天体中微子通量，我们预计，随着IceCube累积并发布更多数据，以及随着AGN的伽马射线目录变得越来越完整，将有可能最终测试这种情况。我们还对星爆和其他形成恒星的星系进行了评论，并得出结论，这些源可能对IceCube观测到的信号有重大贡献，尤其是在检测到的最低能量下。