Journal
PHYSICAL REVIEW LETTERS
Volume 126, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.141101
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Funding
- Ministry of Science and Technology of China
- Ministry of Foreign Affairs of Japan
- Ministry of Education, Culture, Sports, Science and Technology
- Japan Society for the Promotion of Science in Japan
- National Key R&D Program of China [2016YFE0125500]
- National Natural Science Foundation of China [11533007, 11673041, 11873065]
- Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, CAS
- Institute for Cosmic Ray Research (ICRR)
- University of Tokyo
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For the first time, researchers have detected diffuse gamma rays with energies between 100 TeV and 1 PeV in the Galactic disk. This provides strong evidence that cosmic rays are accelerated beyond PeV energies in our Galaxy and spread over the Galactic disk.
We report, for the first time, the long-awaited detection of diffuse gamma rays with energies between 100 TeV and 1 PeV in the Galactic disk. Particularly, all gamma rays above 398 TeV are observed apart from known TeV gamma-ray sources and compatible with expectations from the hadronic emission scenario in which gamma rays originate from the decay of pi(0)'s produced through the interaction of protons with the interstellar medium in the Galaxy. This is strong evidence that cosmic rays are accelerated beyond PeV energies in our Galaxy and spread over the Galactic disk.
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