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The blazar PKS 0605-085 as the origin of the KM3-230213A ultra high energy neutrino event
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abstract
The KM3Net Collaboration has recently reported on the observation of a remarkable event KM3-230213A that could have been produced by an ultra high energy cosmic neutrino. The origin of this event is still unclear. In particular, the cosmogenic neutrino scenario is not favoured due to the non-observation of a similar event by the IceCube detector, and most galactic scenarios are disfavoured as well. We show that the blazar PKS 0605-085 is a viable source of the KM3-230213A event. In particular, even though this blazar is located at 2.4$^{\circ}$ from the KM3-230213A event, the association between the blazar and the event is not unlikely due to a sizable direction systematic uncertainty of $\approx 1.5^{\circ}$ reported by the KM3Net Collaboration. Furthermore, we show that the observation of a $\approx$72 PeV neutrino from PKS 0605-085 is entirely possible given that a $\approx$7.5 PeV neutrino could have been observed from another blazar TXS 0506+056. Finally, we consider $\gamma$-ray constraints on the number of observable neutrino events and show that for the case of the external photon field production mechanism these constraints could be relaxed due to the often-neglected effect of the isotropisation of the hadronically-produced electrons in the magnetic field of the blob. We encourage further multi-wavelength observations of the blazar PKS 0605-085.
Forward citations
Cited by 7 Pith papers
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The KM3NeT 220 PeV event: a neutrino messenger from the grand unification scale?
The KM3NeT 220 PeV event is read as X o u ū decay of a flavored onium relic at m_X=4.4e8 GeV, with lifetime fixing a mediator near 10^16 GeV under a single Higgs insertion.
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Earth rotation turns event timing into a geometric probe of UHE neutrino origin
Earth-rotation timing lowers the number of future KM3NeT events needed to exclude a dark-matter origin of KM3-230213A from ~22–27 to ~14–16.
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The Highest-Energy Neutrino Event Constrains Dark Matter-Neutrino Interactions
KM3-230213A limits dark matter-neutrino scattering to below about 1e-22 cm^2/GeV at 220 PeV, but most simple dark matter models are excluded by unitarity above MeV masses.
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`Dark' Matter Effect as a Novel Solution to the KM3-230213A Puzzle
Dark matter scattering in the Earth, sourced by a flaring blazar, can explain the KM3-230213A event while yielding few or no IceCube events in a viable parameter space.
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Clash of the Titans: ultra-high energy KM3NeT event versus IceCube data
A single KM3NeT event above 10 PeV is in 2.9 to 3.6 sigma tension with IceCube's non-observation under all standard source models, pointing toward a new astrophysical source.
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Can a gamma-ray dim radio blazar produce a 200-PeV neutrino? The case of PMN J0606$-$0724 and KM3-230213A
A gamma-ray dim radio blazar, PMN J0606-0724, can plausibly explain the 200 PeV KM3NeT neutrino through proton-photon interactions in its radio core, with the associated gamma rays absorbed internally.
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Interpreting the KM3-230213A PeV Neutrino Event via Vector Dark Matter Decay and Its Multi-Messenger Signatures
A U(1)_X vector dark matter model explains the KM3-230213A PeV neutrino via DM decay and predicts a cosmic string gravitational wave background consistent with PTA observations, but with several parameters fitted to the data.
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