Constraining the fraction of primary gamma rays at ultra-high energies from the muon data of the Yakutsk extensive-air-shower array

By making use of the data on the total signal and on the muon component of the air showers detected by the Yakutsk array, we analyze, in the frameworks of the recently suggested event-by-event approach, how large the fraction of primary gamma-rays at ultra-high energies can be. We derive upper limit...

Full description

Bibliographic Details
Main Authors: Glushkov, A. V., Gorbunov, D. S., Makarov, I. T., Pravdin, M. I., Rubtsov, G. I., Sleptsov, I. E., Troitsky, S. V.
Format: Text
Language:unknown
Published: arXiv 2007
Subjects:
Astrophysics astro-ph
FOS Physical sciences
Yakutsk
Online Access:https://dx.doi.org/10.48550/arxiv.astro-ph/0701245
https://arxiv.org/abs/astro-ph/0701245
id ftdatacite:10.48550/arxiv.astro-ph/0701245
record_format openpolar
spelling ftdatacite:10.48550/arxiv.astro-ph/0701245 2023-05-15T18:45:23+02:00 Constraining the fraction of primary gamma rays at ultra-high energies from the muon data of the Yakutsk extensive-air-shower array Glushkov, A. V. Gorbunov, D. S. Makarov, I. T. Pravdin, M. I. Rubtsov, G. I. Sleptsov, I. E. Troitsky, S. V. 2007 https://dx.doi.org/10.48550/arxiv.astro-ph/0701245 https://arxiv.org/abs/astro-ph/0701245 unknown arXiv https://dx.doi.org/10.1134/s0021364007030010 Assumed arXiv.org perpetual, non-exclusive license to distribute this article for submissions made before January 2004 http://arxiv.org/licenses/assumed-1991-2003/ Astrophysics astro-ph FOS Physical sciences article-journal Article ScholarlyArticle Text 2007 ftdatacite https://doi.org/10.48550/arxiv.astro-ph/0701245 https://doi.org/10.1134/s0021364007030010 2022-04-01T15:50:52Z By making use of the data on the total signal and on the muon component of the air showers detected by the Yakutsk array, we analyze, in the frameworks of the recently suggested event-by-event approach, how large the fraction of primary gamma-rays at ultra-high energies can be. We derive upper limits on the photon fraction in the integral flux of primary cosmic rays. At the 95% confidence level (CL), these limits are 22% for primary energies E_0>4\cdot 10^{19}eV and 12% for E_0>2\cdot 10^{19}eV. Despite the presence of muonless events, the data are consistent with complete absence of photons at least at 95% CL. The sensitivity of the results to systematic uncertainties, in particular to those of the energy determination for non-photon primaries, is discussed. : 5 pages, 2 figures Text Yakutsk DataCite Metadata Store (German National Library of Science and Technology) Yakutsk
institution Open Polar
collection DataCite Metadata Store (German National Library of Science and Technology)
op_collection_id ftdatacite
language unknown
topic Astrophysics astro-ph
FOS Physical sciences
spellingShingle Astrophysics astro-ph
FOS Physical sciences
Glushkov, A. V.
Gorbunov, D. S.
Makarov, I. T.
Pravdin, M. I.
Rubtsov, G. I.
Sleptsov, I. E.
Troitsky, S. V.
Constraining the fraction of primary gamma rays at ultra-high energies from the muon data of the Yakutsk extensive-air-shower array
topic_facet Astrophysics astro-ph
FOS Physical sciences
description By making use of the data on the total signal and on the muon component of the air showers detected by the Yakutsk array, we analyze, in the frameworks of the recently suggested event-by-event approach, how large the fraction of primary gamma-rays at ultra-high energies can be. We derive upper limits on the photon fraction in the integral flux of primary cosmic rays. At the 95% confidence level (CL), these limits are 22% for primary energies E_0>4\cdot 10^{19}eV and 12% for E_0>2\cdot 10^{19}eV. Despite the presence of muonless events, the data are consistent with complete absence of photons at least at 95% CL. The sensitivity of the results to systematic uncertainties, in particular to those of the energy determination for non-photon primaries, is discussed. : 5 pages, 2 figures
format Text
author Glushkov, A. V.
Gorbunov, D. S.
Makarov, I. T.
Pravdin, M. I.
Rubtsov, G. I.
Sleptsov, I. E.
Troitsky, S. V.
author_facet Glushkov, A. V.
Gorbunov, D. S.
Makarov, I. T.
Pravdin, M. I.
Rubtsov, G. I.
Sleptsov, I. E.
Troitsky, S. V.
author_sort Glushkov, A. V.
title Constraining the fraction of primary gamma rays at ultra-high energies from the muon data of the Yakutsk extensive-air-shower array
title_short Constraining the fraction of primary gamma rays at ultra-high energies from the muon data of the Yakutsk extensive-air-shower array
title_full Constraining the fraction of primary gamma rays at ultra-high energies from the muon data of the Yakutsk extensive-air-shower array
title_fullStr Constraining the fraction of primary gamma rays at ultra-high energies from the muon data of the Yakutsk extensive-air-shower array
title_full_unstemmed Constraining the fraction of primary gamma rays at ultra-high energies from the muon data of the Yakutsk extensive-air-shower array
title_sort constraining the fraction of primary gamma rays at ultra-high energies from the muon data of the yakutsk extensive-air-shower array
publisher arXiv
publishDate 2007
url https://dx.doi.org/10.48550/arxiv.astro-ph/0701245
https://arxiv.org/abs/astro-ph/0701245
geographic Yakutsk
geographic_facet Yakutsk
genre Yakutsk
genre_facet Yakutsk
op_relation https://dx.doi.org/10.1134/s0021364007030010
op_rights Assumed arXiv.org perpetual, non-exclusive license to distribute this article for submissions made before January 2004
http://arxiv.org/licenses/assumed-1991-2003/
op_doi https://doi.org/10.48550/arxiv.astro-ph/0701245
https://doi.org/10.1134/s0021364007030010
_version_ 1766236432467230720

Similar Items