A. Abdul Halim (Avtor), P. Abreu (Avtor), M. Aglietta (Avtor), Ingo Allekotte (Avtor), K. Almeida Cheminant (Avtor), J. P. Lundquist (Avtor), S. U. Shivashankara (Avtor), Serguei Vorobiov (Avtor), Danilo Zavrtanik (Avtor), Marko Zavrtanik (Avtor)

Povzetek

We present results of the measurement of large-scale anisotropies in the arrival directions of ultra–high-energy cosmic rays detected at the Pierre Auger Observatory during 19 yr of operation, prior to AugerPrime, the upgrade of the observatory. The 3D dipole amplitude and direction are reconstructed above 4 EeV in four energy bins. Besides the established dipolar anisotropy in right ascension above 8 EeV, the Fourier amplitude of the 8–16 EeV energy bin is now also above the 5σ discovery level. No time variation of the dipole moment above 8 EeV is found, setting an upper limit to the rate of change of such variations of 0.3% per year at the 95% confidence level. Additionally, the results for the angular power spectrum are shown, demonstrating no other statistically significant multipoles. The results for the equatorial dipole component down to 0.03 EeV are presented, using for the first time a data set obtained with a trigger that has been optimized for lower energies. Finally, model predictions are discussed and compared with observations, based on two source emission scenarios obtained in the combined fit of spectrum and composition above 0.6 EeV.

Ključne besede

ultra–high-energy cosmic rays;UHECRs;UHECR anisotropies;Pierre Auger Observatory;dipolar anisotropy in right ascension;Fourier amplitude analysis;angular power spectrum;equatorial dipole component;UHECR source emission scenarios;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UNG - Univerza v Novi Gorici
UDK: 52
COBISS: 216297731 Povezava se bo odprla v novem oknu
ISSN: 1538-4357
Št. ogledov: 104
Št. prenosov: 0
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Strani: str. 1-13
Letnik: ǂVol. ǂ967
Zvezek: ǂno. ǂ1, [article no.] 48
Čas izdaje: Nov. 2024
DOI: 10.3847/1538-4357/ad843b
ID: 25415424