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Title:Large-scale cosmic-ray anisotropies with 19 yr of data from the Pierre Auger Observatory
Authors:ID Abdul Halim, A. (Author)
ID Abreu, P. (Author)
ID Aglietta, M. (Author)
ID Allekotte, Ingo (Author)
ID Almeida Cheminant, K. (Author)
ID Lundquist, Jon Paul (Author)
ID Shivashankara, Shima Ujjani (Author)
ID Vorobiov, Serguei (Author)
ID Zavrtanik, Danilo (Author)
ID Zavrtanik, Marko (Author)
Files:URL https://iopscience.iop.org/article/10.3847/1538-4357/ad843b/pdf
 
.pdf Abdul_Halim_2024_ApJ_976_48.pdf (1,16 MB)
MD5: 90369B3408E62A28196FF1BC50BA29D4
 
URL https://iopscience.iop.org/article/10.3847/1538-4357/ad843b
 
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Language:English
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract: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.
Keywords: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
Publication status:Published
Publication version:Version of Record
Publication date:01.11.2024
Year of publishing:2024
Number of pages:str. 1-13
Numbering:Vol. 967, no. 1, [article no.] 48
PID:20.500.12556/RUNG-9502 New window
COBISS.SI-ID:216297731 New window
UDC:52
ISSN on article:1538-4357
DOI:10.3847/1538-4357/ad843b New window
NUK URN:URN:SI:UNG:REP:FKEHEM4A
Publication date in RUNG:26.11.2024
Views:758
Downloads:5
Metadata:XML DC-XML DC-RDF
:
ABDUL HALIM, A., ABREU, P., AGLIETTA, M., ALLEKOTTE, Ingo, ALMEIDA CHEMINANT, K., LUNDQUIST, Jon Paul, SHIVASHANKARA, Shima Ujjani, VOROBIOV, Serguei, ZAVRTANIK, Danilo and ZAVRTANIK, Marko, 2024, Large-scale cosmic-ray anisotropies with 19 yr of data from the Pierre Auger Observatory. The Astrophysical journal [online]. 2024. Vol. 967, no. 1,  48, p. 1–13. [Accessed 7 April 2025]. DOI 10.3847/1538-4357/ad843b. Retrieved from: https://repozitorij.ung.si/IzpisGradiva.php?lang=eng&id=9502
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Record is a part of a journal

Title:The Astrophysical journal
Shortened title:Astrophys. j.
Publisher:University of Chicago Press for the American Astronomical Society
ISSN:1538-4357
COBISS.SI-ID:515079705 New window

Document is financed by a project

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:P1-0031
Name:Večglasniška astrofizika
Funder:ARIS - Slovenian Research and Innovation Agency
Project number:P1-0385
Name:Daljinsko zaznavanje atmosferskih lastnosti
Funder:ARIS - Slovenian Research and Innovation Agency
Project number:I0-0033
Name:Infrastrukturni program Univerze v Novi Gorici
Funder:ARIS - Slovenian Research and Innovation Agency
Project number:N1-0111
Name:Identifikacija izvorov kozmičnih žarkov med aktivnimi galaksijami s curki

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License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

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