Upper limits on the isotropic diffuse flux of cosmic PeV photons from Carpet-2 observations
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.
Keywords
Cite
@article{arxiv.2212.01088,
title = {Upper limits on the isotropic diffuse flux of cosmic PeV photons from Carpet-2 observations},
author = {D. D. Dzhappuev and Yu. Z. Afashokov and I. M. Dzaparova and T. A. Dzhatdoev and E. A. Gorbacheva and I. S. Karpikov and M. M. Khadzhiev and N. F. Klimenko and A. U. Kudzhaev and A. N. Kurenya and A. S. Lidvansky and O. I. Mikhailova and V. B. Petkov and E. I. Podlesnyi and N. A. Pozdnukhov and V. S. Romanenko and G. I. Rubtsov and S. V. Troitsky and I. B. Unatlokov and I. A. Vaiman and A. F. Yanin and K. V. Zhuravleva},
journal= {arXiv preprint arXiv:2212.01088},
year = {2023}
}
Comments
5 pages, 3 figures, JETPL.cls; V2: references added, version accepted by JETP Letters