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Title:Search for anisotropy of ultrahigh energy cosmic rays with the Telescope Array experiment
Authors:ID Abu-Zayyad, T. (Author)
ID Lundquist, Jon Paul, UNG (Author), et al.
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Language:English
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:We study the anisotropy of Ultra-High Energy Cosmic Ray (UHECR) events collected by the Telescope Array (TA) detector in the first 40 months of operation. Following earlier studies, we examine event sets with energy thresholds of 10 EeV, 40 EeV, and 57 EeV. We find that the distributions of the events in right ascension and declination are compatible with an isotropic distribution in all three sets. We then compare with previously reported clustering of the UHECR events at small angular scales. No significant clustering is found in the TA data. We then check the events with E > 57 EeV for correlations with nearby active galactic nuclei. No significant correlation is found. Finally, we examine all three sets for correlations with the large-scale structure (LSS) of the universe. We find that the two higher-energy sets are compatible with both an isotropic distribution and the hypothesis that UHECR sources follow the matter distribution of the universe (the LSS hypothesis), while the event set with E > 10 EeV is compatible with isotropy and is not compatible with the LSS hypothesis at 95% CL unless large deflection angles are also assumed. We show that accounting for UHECR deflections in a realistic model of the Galactic magnetic field can make this set compatible with the LSS hypothesis.
Keywords:acceleration of particles, astroparticle physics, cosmic rays, magnetic fields, methods: statistical, relativistic processes
Publication version:Version of Record
Year of publishing:2012
Number of pages:11
Numbering:1, 757
PID:20.500.12556/RUNG-5329-894b26d0-1d4a-567d-730f-bf6ee04abf54 New window
COBISS.SI-ID:15998979 New window
DOI:10.1088/0004-637X/757/1/26 New window
NUK URN:URN:SI:UNG:REP:BZQSD8AT
Publication date in RUNG:19.05.2020
Views:4161
Downloads:0
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ABU-ZAYYAD, T. and LUNDQUIST, Jon Paul, 2012, Search for anisotropy of ultrahigh energy cosmic rays with the Telescope Array experiment. The Astrophysical Journal [online]. 2012. Vol. 1, no. 757. [Accessed 13 April 2025]. DOI 10.1088/0004-637X/757/1/26. Retrieved from: https://repozitorij.ung.si/IzpisGradiva.php?lang=eng&id=5329
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Record is a part of a journal

Title:The Astrophysical Journal
Year of publishing:2012

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License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:19.05.2020

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