Upper limits on the isotropic diffuse flux of cosmic PeV photons from Carpet-2 observations

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 as...

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Published in:arXiv.org 2022-12
Main 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, Yanin, A F, Zhuravleva, K V
Format: Article
Language:English
Subjects:
Astronomical models
Cosmic ray showers
Energy bands
Gamma rays
Neutrinos
Statistical methods
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.2212.01088