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

Abstract

A neutrino-like event with an energy of $\sim 220\mathrm{PeV}$ 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.

6 pages, 5 figures; accepted for publication in ApJL

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• Search for Magnetically Broadened Cascade Emission From Blazars with VERITAS
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Cited by in corpus (12)

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• Super heavy dark matter origin of the PeV neutrino event: KM3-230213A
• Cosmological Origin of the KM3-230213A event and associated Gravitational Waves
• Neutrinos from Primordial Black Holes in Theories with Extra Dimensions
• Cosmic-Ray Constraints on the Flux of Ultra-High-Energy Neutrino Event KM3-230213A
• An Accretion Flare Interpretation for the Ultra-High-Energy Neutrino Event KM3-230213A
• Does the 220 PeV Event at KM3NeT Point to New Physics?
• Cosmogenic Origin of KM3-230213A: Delayed Gamma-Ray Emission from A Cosmic-Ray Transient
• Particle Astrophysics with High and Ultrahigh Energy Neutrinos
• High-Energy Neutrinos from Cosmic-Ray Scatterings with Supernova Neutrinos
• KM3-230213A and IceCube Neutrino Events from Metastable Dark Matter of Primordial Black Hole Origin
• Recent advances on multimessenger astrophysics: Centaurus A, GW 170817, and KM3-230213A