Lorenzo Apollonio (Avtor), A. Abdul Halim (Avtor), P. Abreu (Avtor), Andrej Filipčič (Avtor), J. P. Lundquist (Avtor), S. U. Shivashankara (Avtor), Samo Stanič (Avtor), Serguei Vorobiov (Avtor), Danilo Zavrtanik (Avtor), Marko Zavrtanik (Avtor)

Povzetek

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.

Ključne besede

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;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.08 - Objavljeni znanstveni prispevek na konferenci
Organizacija: UNG - Univerza v Novi Gorici
UDK: 539.1
COBISS: 234588419 Povezava se bo odprla v novem oknu
ISSN: 1824-8039
Št. ogledov: 206
Št. prenosov: 0
Ocena: 0 (0 glasov)
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Ostali podatki

Strani: 8 str.
DOI: 10.22323/1.484.0068
ID: 26315087