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A source of extremely high-energy particles in the Milky Way identified
A source of extremely high-energy particles in the Milky Way identified
An accelerator of the highest-energy protons in our galaxy has been identified; it could help scientists better understand the nature of these fast-moving particles that fill the space between stars.
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)
Cosmic rays are made primarily of protons with a few electrons sprinkled in, and they can reach energies even higher than what human-made accelerators can produce. Considering human-made accelerators, such as the Large Hadron Collider on the border of Switzerland and France, can move protons to near the speed of light, it’s no wonder that these super-energetic particles can influence cosmic events across the galaxy.
An accelerator of the highest-energy cosmic-ray protons in our galaxy has been identified conclusively, thanks to a Hiroshima University-led international team of researchers assessing data from three major observatories on Earth and in space. This could help scientists better understand the nature of these fast-moving particles that fill the space between stars and influence cosmic events across the Milky Way galaxy.
The findings were published on July 16, 2026 in The Astrophysical...