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arXiv · 2205.14864

A search for photons with energies above $2{\times}10^{17}$ eV using hybrid data from the low-energy extensions of the Pierre Auger Observatory

The Pierre Auger Collaboration·P. Abreu·M. Aglietta·J. M. Albury·I. Allekotte·K. Almeida Cheminant·A. Almela·J. Alvarez-Muñiz·R. Alves Batista·J. Ammerman Yebra·G. A. Anastasi·L. Anchordoqui·B. Andrada·S. Andringa·C. Aramo·P. R. Araújo Ferreira·E. Arnone·J. C. Arteaga Velázquez·H. Asorey·P. Assis·G. Avila·E. Avocone·A. M. Badescu·A. Bakalova·A. Balaceanu·F. Barbato·J. A. Bellido·C. Berat·M. E. Bertaina·G. Bhatta·P. L. Biermann·V. Binet·K. Bismark·T. Bister·J. Biteau·J. Blazek·C. Bleve·J. Blümer·M. Boháčová·D. Boncioli·C. Bonifazi·L. Bonneau Arbeletche·N. Borodai·A. M. Botti·J. Brack·T. Bretz·P. G. Brichetto Orchera·F. L. Briechle·P. Buchholz·A. Bueno·S. Buitink·M. Buscemi·M. Büsken·K. S. Caballero-Mora·L. Caccianiga·F. Canfora·I. Caracas·R. Caruso·A. Castellina·F. Catalani·G. Cataldi·L. Cazon·M. Cerda·J. A. Chinellato·J. Chudoba·L. Chytka·R. W. Clay·A. C. Cobos Cerutti·R. Colalillo·A. Coleman·M. R. Coluccia·R. Conceição·A. Condorelli·G. Consolati·F. Contreras·F. Convenga·D. Correia dos Santos·C. E. Covault·S. Dasso·K. Daumiller·B. R. Dawson·J. A. Day·R. M. de Almeida·J. de Jesús·S. J. de Jong·J. R. T. de Mello Neto·I. De Mitri·J. de Oliveira·D. de Oliveira Franco·F. de Palma·V. de Souza·E. De Vito·A. Del Popolo·M. del Río·O. Deligny·L. Deval·A. di Matteo·M. Dobre·C. Dobrigkeit·J. C. D'Olivo
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Abstract

Ultra-high-energy photons with energies exceeding $10^{17}$ 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 $10^{15}$ eV range further motivate searches for even higher-energy photons. In this paper, we present a search for photons with energies exceeding $2{\times}10^{17}$ eV using about 5.5 years 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 $10^{17}$ and $10^{18}$ eV.

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The Pierre Auger Collaboration, P. Abreu, M. Aglietta, J. M. Albury, I. Allekotte, K. Almeida Cheminant, A. Almela, J. Alvarez-Muñiz, R. Alves Batista, J. Ammerman Yebra, G. A. Anastasi, L. Anchordoqui, B. Andrada, S. Andringa, C. Aramo, P. R. Araújo Ferreira, E. Arnone, J. C. Arteaga Velázquez, H. Asorey, P. Assis, G. Avila, E. Avocone, A. M. Badescu, A. Bakalova, A. Balaceanu, F. Barbato, J. A. Bellido, C. Berat, M. E. Bertaina, G. Bhatta, P. L. Biermann, V. Binet, K. Bismark, T. Bister, J. Biteau, J. Blazek, C. Bleve, J. Blümer, M. Boháčová, D. Boncioli, C. Bonifazi, L. Bonneau Arbeletche, N. Borodai, A. M. Botti, J. Brack, T. Bretz, P. G. Brichetto Orchera, F. L. Briechle, P. Buchholz, A. Bueno, S. Buitink, M. Buscemi, M. Büsken, K. S. Caballero-Mora, L. Caccianiga, F. Canfora, I. Caracas, R. Caruso, A. Castellina, F. Catalani, G. Cataldi, L. Cazon, M. Cerda, J. A. Chinellato, J. Chudoba, L. Chytka, R. W. Clay, A. C. Cobos Cerutti, R. Colalillo, A. Coleman, M. R. Coluccia, R. Conceição, A. Condorelli, G. Consolati, F. Contreras, F. Convenga, D. Correia dos Santos, C. E. Covault, S. Dasso, K. Daumiller, B. R. Dawson, J. A. Day, R. M. de Almeida, J. de Jesús, S. J. de Jong, J. R. T. de Mello Neto, I. De Mitri, J. de Oliveira, D. de Oliveira Franco, F. de Palma, V. de Souza, E. De Vito, A. Del Popolo, M. del Río, O. Deligny, L. Deval, A. di Matteo, M. Dobre, C. Dobrigkeit, J. C. D'Olivo. 2022-05-30. A search for photons with energies above $2{\times}10^{17}$ eV using hybrid data from the low-energy extensions of the Pierre Auger Observatory. https://doi.org/10.3847/1538-4357/ac7393

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