A Search for Photons with Energies Above 2 × 10¹⁷ eV Using Hybrid Data from the Low-Energy Extensions of the Pierre Auger Observatory
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Date
2022
Authors
Abreu, P.
Aglietta, M.
Albury, J.M.
Allekotte, I.
Cheminant, K.A.
Almela, A.
Alvarez-Muñiz, J.
Batista, R.A.
Yebra, J.A.
Anastasi, G.A.
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The Astrophysical Journal: an international review of astronomy and astronomical physics, 2022; 933(2):125-1-125-11
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P. Abreu ... J. M. Albury ... J. A. Bellido ... R. W. Clay ... B. R. Dawson, J. A. Day ... T. D. Grubb ... V. M. Harvey ... G. C. Hill ... B. C. Manning ... T. Sudholz ... et al. (The Pierre Auger Collaboration)
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Abstract
Ultra-high-energy photons with energies exceeding 10¹⁷ eV offer a wealth of connections to different aspects of cosmic-ray astrophysics as well as to gamma-ray and neutrino astronomy. The recent observations of photons with energies in the 10¹⁵ eV range further motivate searches for even higher-energy photons. In this paper, we present a search for photons with energies exceeding 2 × 10¹⁷ eV using about 5.5 yr of hybrid data from the low-energy extensions of the Pierre Auger Observatory. The upper limits on the integral photon flux derived here are the most stringent ones to date in the energy region between 10¹⁷ and 10¹⁸ eV.
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© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.