Scientists Link 220 PeV Neutrino to Blazars, 10 Times Past High-Energy Events
Updated
Updated · ScienceDaily · Jun 1
Scientists Link 220 PeV Neutrino to Blazars, 10 Times Past High-Energy Events
3 articles · Updated · ScienceDaily · Jun 1
A new JCAP study says a realistic population of blazars could explain the 220 PeV neutrino detected by KM3NeT/ARCA off Sicily on Feb. 13, 2023—the most energetic cosmic neutrino ever observed.
The team turned to blazars after finding no electromagnetic counterpart from the same sky region, pointing away from a single identifiable source and toward a diffuse background from many extreme black-hole jets.
Simulations using the AM3 model matched two key constraints: IceCube and other observatories have not seen similar ultra-high-energy neutrinos, and Fermi data show no excess gamma-ray background from the proposed blazar population.
KM3NeT caught the event while only 21 detection lines—about 10% of its planned size—were operating, and researchers said a fuller detector and more data are needed to confirm the blazar explanation.
If confirmed, the result would broaden understanding of how blazars accelerate particles, suggesting they can generate energies beyond what scientists had previously expected.
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Record-Breaking 220 PeV Neutrino KM3-230213A: Discovery, Blazar Origins, and New Physics from KM3NeT
Overview
On February 13, 2023, scientists observed KM3-230213A, an exceptionally high-energy event where a muon, produced by a rare neutrino interaction, passed through the ARCA detector of KM3NeT. Because neutrinos interact very weakly with matter, detectors like KM3NeT rely on capturing the secondary particles or Cherenkov light created during these rare events. KM3-230213A stood out as the most energetic event recorded over nearly 287 days, highlighting both the challenge and success of detecting such elusive cosmic messengers and showcasing the advanced capabilities of the KM3NeT observatory.