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First detection of sub-PeV diffuse gamma rays from the galactic disk; Evidence for ubiquitous galactic cosmic rays beyond PeV energies

銀河円盤からのsub-PeV領域の拡散ガンマ線の初めての検出; PeV超えるエネルギーを持つ銀河宇宙線の証拠

雨森 道紘*; 土屋 晴文 ; Tibet AS$$_{gamma}$$ Collaboration*; 他93名*

Amenomori, Michihiro*; Tsuchiya, Harufumi; Tibet AS$$_{gamma}$$ Collaboration*; 93 of others *

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 $$pi0$$'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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パーセンタイル:99.63

分野:Physics, Multidisciplinary

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