On the Potential Galactic Origin of the Ultra-High-Energy Event KM3-230213A
O. Adriani, S. Aiello, A. Albert, A. R. Alhebsi, M. Alshamsi, S. Alves, Garre, A. Ambrosone, F. Ameli, M. Andre, L. Aphecetche, M. Ardid, S. Ardid,, J. Aublin, F. Badaracco, L. Bailly-Salins, Z. Barda\v{c}ov\'a, B. Baret, A., Bariego-Quintana, Y. Becherini, M. Bendahman
TL;DR
This paper analyzes a record-breaking high-energy neutrino detected by KM3NeT, exploring whether it originated within our galaxy or from extragalactic sources, and concludes an extragalactic origin is most probable.
Contribution
It provides an assessment of the potential galactic origin of an ultra-high-energy neutrino, considering fluxes and acceleration capabilities within the Milky Way.
Findings
The neutrino is likely of cosmic origin.
Galactic sources are unlikely due to flux and acceleration constraints.
Extragalactic origin is most probable.
Abstract
The KM3NeT observatory detected the most energetic neutrino candidate ever observed, with an energy between 72 PeV and 2.6 EeV at the 90% confidence level. The observed neutrino is likely of cosmic origin. In this article, it is investigated if the neutrino could have been produced within the Milky Way. Considering the low fluxes of the Galactic diffuse emission at these energies, the lack of a nearby potential Galactic particle accelerator in the direction of the event and the difficulty to accelerate particles to such high energies in Galactic systems, we conclude that if the event is indeed cosmic, it is most likely of extragalactic origin.
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