| Title: | Amplifying UHECR arrival direction information using mass estimators at the Pierre Auger Observatory |
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| Authors: | ID Apollonio, Lorenzo (Author)
ID Abdul Halim, A. (Author)
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) |
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| Files: |  https://doi.org/10.22323/1.484.0068
 UHECR2024_068.pdf (2,03 MB)
MD5: 1335CA85A140CB40B1C93BFE3AEED78D
https://pos.sissa.it/484/068/
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| Language: | English |
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| Work type: | Unknown |
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| Typology: | 1.08 - Published Scientific Conference Contribution |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | The origin of Ultra-High-Energy Cosmic Rays (UHECRs) is one of the biggest mysteries in modern astrophysics. Since UHECRs are deflected by Galactic and extragalactic magnetic fields, their arrival directions do not point to their sources. Previous analyses conducted on the arrival directions of high-energy events (E ≥ 32 EeV) recorded by the Surface Detector of the Pierre Auger Observatory have not shown significant anisotropies. The largest excess found in the first 19 years of data - at the 4.0 sigma level - is in the region around Centaurus A, and it is also the driving force of a correlation of UHECR arrival directions with a catalog of Starburst Galaxies, which is at the 3.8 sigma level. Since UHECRs are mostly nuclei, the lightest ones (least charged) are also the least deflected. While the mass of the events can be estimated better using the Fluorescence Detector of the Pierre Auger Observatory, the Surface Detector provides the necessary statistics needed for astrophysical studies. The introduction of novel mass-estimation techniques, such as machine learning models and an algorithm based on air-shower universality, will help identify high-rigidity events in the Surface Detector data of the Pierre Auger Observatory. With this work, we present how event-per-event mass estimators can help enhance the sensitivity in the search for anisotropies in the arrival directions of UHECRs at small and intermediate angular scales using simulations. |
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| Keywords: | ultra-high-energy cosmic rays (UHECRs), extensive air showers, Pierre Auger Observatory, UHECR propagation, UHECR arrival directions, UHECR mass composition, Centaurus A radio galaxy, starburst galaxies, air-shower universality |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Year of publishing: | 2025 |
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| Number of pages: | 8 str. |
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| PID: | 20.500.12556/RUNG-10014-de4182a3-0ad5-5a49-6988-e037e4078493  |
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| COBISS.SI-ID: | 234588419 |
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| UDC: | 539.1 |
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| ISSN on article: | 1824-8039 |
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| DOI: | 10.22323/1.484.0068 |
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| NUK URN: | URN:SI:UNG:REP:DDBYOX4A |
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| Publication date in RUNG: | 30.04.2025 |
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| Views: | 445 |
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| Downloads: | 6 |
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