标题： 寻找KM3-230213A中微子源的伽马射线级联 显示英文标题

标题： Looking for the γ-Ray Cascades of the KM3-230213A Neutrino Source

摘要： KM3-230213A事件的极端能量可能会改变我们对宇宙中最高能源的理解。 然而，它也揭示了KM3NeT探测与IceCube对超高能中微子通量的强约束之间的不一致性。 对于KM3NeT和IceCube数据最一致的解释要求KM3-230213A由一个（可能短暂的）源产生，该源偶然位于KM3NeT接受度最大的区域。 在超高能中微子产生的强子模型中，这样的源也会产生明亮的{\gamma }-射线信号，由于与星系际背景光的相互作用，该信号会级联到GeV-TeV能量。 我们利用{\gamma }-Cascade包来模拟此类源的谱、空间扩展和时间延迟，并扫描KM3NeT事件周围的区域以寻找一致的{\gamma }-射线信号。 我们没有发现可证实的类似\textit{费米}-LAT源的证据，并对源红移和源与地球之间的星系际磁场强度的组合进行了限制。 显示英文摘要

摘要： The extreme energy of the KM3-230213A event could transform our understanding of the most energetic sources in the Universe. However, it also reveals an inconsistency between the KM3NeT detection and strong IceCube constraints on the ultra-high energy neutrino flux. The most congruous explanation for the KM3NeT and IceCube data requires KM3-230213A to be produced by a (potentially transient) source fortuitously located in a region where the KM3NeT acceptance is maximized. In hadronic models of ultra-high-energy neutrino production, such a source would also produce a bright {\gamma}-ray signal, which would cascade to GeV--TeV energies due to interactions with extragalactic background light. We utilize the {\gamma}-Cascade package to model the spectrum, spatial extension, and time-delay of such a source, and scan a region surrounding the KM3NeT event to search for a consistent {\gamma}-ray signal. We find no convincing evidence for a comparable \textit{Fermi}-LAT source and place constraints on a combination of the source redshift and the intergalactic magnetic field strength between the source and Earth.