R. U. Abbasi (Author), Mitsuhiro Abe (Author), T. Abu-Zayyad (Author), M. Allen (Author), R. Azuma (Author), E. Barcikowski (Author), J. W. Belz (Author), D. R. Bergman (Author), S. A. Blake (Author), J. P. Lundquist (Author)

Abstract

Motivated by the detection of a significant dipole structure in the arrival directions of ultra-high-energy cosmic rays above 8 EeV reported by the Pierre Auger Observatory (Auger), we search for a large-scale anisotropy using data collected with the surface detector array of the Telescope Array Experiment (TA). With 11 yr of TA data, a dipole structure in a projection of the R.A. is fitted with an amplitude of 3.3% ± 1.9% and a phase of 131° ± 33°. The corresponding 99% confidence-level upper limit on the amplitude is 7.3%. At the current level of statistics, the fitted result is compatible with both an isotropic distribution and the dipole structure reported by Auger.

Keywords

cosmic rays;ultra-high-energy cosmic radiation;cosmic ray sources;cosmic ray showers;cosmic ray detectors;cosmic ray astronomy;extragalactic astronomy;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UNG - University of Nova Gorica
UDC: 524
COBISS: 50454275 Link will open in a new window
ISSN: 2041-8205
Views: 1645
Downloads: 0
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Other data

URN: URN:SI:UNG
Pages: str. 1-5
Volume: ǂVol. ǂ898
Issue: ǂno. ǂ2
Chronology: 2020
DOI: 10.3847/2041-8213/aba0bc
ID: 12535941