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arXiv 2502.09545astro-ph.HE
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与 KM3NeT 超高能事件 KM3-230213A 相关的级联伽马射线辐射

Cascaded Gamma-ray Emission Associated with the KM3NeT Ultra-High-Energy Event KM3-230213A

Ke Fang, Francis Halzen, Dan Hooper

AI总结:

针对 KM3NeT/ARCA 探测到的约 220 PeV 类中微子事件,研究计算不同源距离和 IGMF 强度下的级联伽马射线通量,并指出现有仪器在多数情形下可观测相关辐射。

摘要:

KM3NeT/ARCA 望远镜最近探测到一个能量约为 220 PeV 的类中微子事件。如果该中微子来自天体物理源,或来自超高能宇宙线在星系际介质中的相互作用,那么与中微子共同产生的超高能伽马射线将与河外背景光发生散射,产生电磁级联,并形成 GeV 至 TeV 能量的辐射。本文中,我们在考虑不同源距离和星系际磁场(IGMF)强度的情况下,计算了来自该中微子源的伽马射线通量。我们发现,除非 IGMF 强度满足 B≳3×10^-13 G,或者超高能伽马射线在源内部被衰减,否则相关的伽马射线辐射可以被现有的成像大气切伦科夫望远镜和空气簇射伽马射线天文台观测到。在后一种情况下,预计该源是射电噪的。

英文摘要:

A neutrino-like event with an energy of $\sim 220 \,{\rm PeV}$ was recently detected by the KM3NeT/ARCA telescope. If this neutrino comes from an astrophysical source, or from the interaction of an ultra-high-energy cosmic ray in the intergalactic medium, the ultra-high-energy gamma rays that are co-produced with the neutrinos will scatter with the extragalactic background light, producing an electromagnetic cascade and resulting in emission at GeV-to-TeV energies. In this paper, we compute the gamma-ray flux from this neutrino source considering various source distances and strengths of the intergalactic magnetic field (IGMF). We find that the associated gamma-ray emission could be observed by existing imaging air cherenkov telescopes and air shower gamma-ray observatories, unless the strength of the IGMF is $B\gtrsim 3\times 10^{-13}$ G, or the ultra-high-energy gamma-rays are attenuated inside of the source itself. In the latter case, this source is expected to be radio-loud.

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。

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