Milky Way's High-Energy Particle Source Found
An international research team has identified a high-energy proton PeVatron in the Milky Way using data from the Fermi Gamma-ray Space Telescope. This discovery helps explain the origin of cosmic rays that reach energies exceeding one quadrillion electron volts.
Observation by NASA's Fermi Gamma-ray Space Telescope identified GeV gamma-ray excess toward LHAASO J1912-1014u and confirm it to be a proton PeVatron through multiwavelength observations and modeling. The source is marked by a solid circle and is largely extended, with a diameter of more than 1 degree. For comparison, the size of the Moon is indicated by a dashed circle. (Adapted from Tsunefumi Mizuno, et al. Astrophysical Journal. July 16, 2026)
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