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Upper Limits on the Isotropic Diffuse Flux of Cosmic PeV Photons from Carpet-2 Observations

  • ASTROPHYSICS AND COSMOLOGY
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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.

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Notes

  1. We have tested explicitly that reasonable variations of the bin size do not affect the result.

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Funding

This work was supported by the Ministry of Science and Higher Education of the Russian Federation, contract no. 075-15-2020-778.

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Authors and Affiliations

  1. Institute for Nuclear Research, Russian Academy of Sciences, 117312, Moscow, Russia

    D. D. Dzhappuev, Yu. Z. Afashokov, I. M. Dzaparova, T. A. Dzhatdoev, E. A. Gorbacheva, I. S. Karpikov, M. M. Khadzhiev, N. F. Klimenko, A. U. Kudzhaev, A. N. Kurenya, A. S. Lidvansky, O. I. Mikhailova, V. B. Petkov, E. I. Podlesnyi, N. A. Pozdnukhov, V. S. Romanenko, G. I. Rubtsov, S. V. Troitsky, I. B. Unatlokov, I. A. Vaiman, A. F. Yanin & K. V. Zhuravleva

  2. Institute of Astronomy, Russian Academy of Sciences, 119017, Moscow, Russia

    I. M. Dzaparova & V. B. Petkov

  3. Moscow State University, 119991, Moscow, Russia

    T. A. Dzhatdoev, E. I. Podlesnyi, N. A. Pozdnukhov & S. V. Troitsky

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  1. D. D. Dzhappuev
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  2. Yu. Z. Afashokov
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  3. I. M. Dzaparova
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  4. T. A. Dzhatdoev
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  5. E. A. Gorbacheva
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  6. I. S. Karpikov
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  7. M. M. Khadzhiev
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  8. N. F. Klimenko
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  9. A. U. Kudzhaev
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  11. A. S. Lidvansky
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  12. O. I. Mikhailova
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  13. V. B. Petkov
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  14. E. I. Podlesnyi
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  15. N. A. Pozdnukhov
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  17. G. I. Rubtsov
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  18. S. V. Troitsky
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  19. I. B. Unatlokov
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  20. I. A. Vaiman
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  21. A. F. Yanin
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Corresponding author

Correspondence to S. V. Troitsky.

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Dzhappuev, D.D., Afashokov, Y.Z., Dzaparova, I.M. et al. Upper Limits on the Isotropic Diffuse Flux of Cosmic PeV Photons from Carpet-2 Observations. Jetp Lett. 117, 184–188 (2023). https://doi.org/10.1134/S0021364022603244

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  • DOI: https://doi.org/10.1134/S0021364022603244

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