| Title: | Search for photons above ▫$10^19$▫ eV with the surface detector of the Pierre Auger Observatory |
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| Authors: | ID Abreu, P. (Author)
ID Filipčič, Andrej (Author)
ID Lundquist, Jon Paul (Author)
ID Shivashankara, Shima Ujjani (Author)
ID Stanič, Samo (Author)
ID Vorobiov, Serguei (Author)
ID Zavrtanik, Danilo (Author)
ID Zavrtanik, Marko (Author)
ID Zehrer, Lukas (Author), et al. |
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| Files: |  https://iopscience.iop.org/article/10.1088/1475-7516/2023/05/021
 Abreu_2023_J._Cosmol._Astropart._Phys._2023_021.pdf (2,46 MB)
MD5: 0663DE568AD1B7183CF4596E7200D50A
https://doi.org/10.1088/1475-7516/2023/05/021
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| Language: | English |
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| Work type: | Unknown |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | We use the surface detector of the Pierre Auger Observatory to search for air showers initiated by photons with an energy above 10[sup]19 eV. Photons in the zenith angle range from 30 deg. to 60 deg. can be identified in the overwhelming background of showers initiated by charged cosmic rays through the broader time structure of the signals induced in the water-Cherenkov detectors of the array and the steeper lateral distribution of shower particles reaching ground. Applying the search method to data collected between January 2004 and June 2020, upper limits at 95% CL are set to an E[sup]-2 diffuse flux of ultra-high energy photons above 10[sup]19 eV, 2 × 10[sup]19 eV and 4 × 10[sup]19 eV amounting to 2.11 × 10[sup]-3, 3.12 × 10[sup]-4 and 1.72 × 10[sup]-4 km-2 sr-1 yr-1, respectively. While the sensitivity of the present search around 2 × 10[sup]19 eV approaches expectations of cosmogenic photon fluxes in the case of a pure-proton composition, it is one order of magnitude above those from more realistic mixed-composition models. The inferred limits have also implications for the search of super-heavy dark matter that are discussed and illustrated. |
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| Keywords: | ultra-high-energy cosmic rays, UHE photons, Pierre Auger Observatory, extensive air showers, water Cherenkov detectors |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 01.05.2023 |
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| Year of publishing: | 2023 |
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| Number of pages: | str. 1-24 |
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| Numbering: | Vol. 2023, no. 5, [article no.] 021 |
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| PID: | 20.500.12556/RUNG-8344-9752b62b-ce75-126b-3644-be3ad0e385b4  |
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| COBISS.SI-ID: | 161596675 |
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| UDC: | 52 |
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| ISSN on article: | 1475-7516 |
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| DOI: | 10.1088/1475-7516/2023/05/021 |
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| NUK URN: | URN:SI:UNG:REP:OF9VYJWQ |
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| Publication date in RUNG: | 18.08.2023 |
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| Views: | 694 |
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| Downloads: | 8 |
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