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- Title
Upper Limits on the Isotropic Diffuse Flux of Cosmic PeV Photons from Carpet-2 Observations.
- Authors
Dzhappuev, D. D.; Afashokov, Yu. Z.; Dzaparova, I. M.; Dzhatdoev, T. A.; Gorbacheva, E. A.; Karpikov, I. S.; Khadzhiev, M. M.; Klimenko, N. F.; Kudzhaev, A. U.; Kurenya, A. N.; Lidvansky, A. S.; Mikhailova, O. I.; Petkov, V. B.; Podlesnyi, E. I.; Pozdnukhov, N. A.; Romanenko, V. S.; Rubtsov, G. I.; Troitsky, S. V.; Unatlokov, I. B.; Vaiman, I. A.
- Abstract
Isotropic diffuse gamma-ray flux in the PeV energy band is an important tool for multimessenger tests of models of the origin of high-energy astrophysical neutrinos and for new-physics searches. So far, this flux has not yet been observed. Carpet-2 is an air-shower experiment capable of detecting astrophysical gamma rays with energies above 0.1 PeV. Here we report the upper limits on the isotropic gamma-ray flux from Carpet-2 data obtained in 1999–2011 and 2018–2022. These results, obtained with the new statistical method based on the shape of the muon-number distribution, summarize Carpet-2 observations as the upgraded installation, Carpet-3, starts its operation.
- Subjects
GAMMA rays; PHOTONS; ENERGY bands; NEUTRINOS
- Publication
JETP Letters, 2023, Vol 117, Issue 3, p184
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S0021364022603244