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Title:Search for large-scale anisotropy on arrival directions of ultra-high-energy cosmic rays observed with the telescope array experiment
Authors:Abbasi, R. U. (Author)
Abe, Mitsuhiro (Author)
Abu-Zayyad, T. (Author)
Allen, M. (Author)
Azuma, R. (Author)
Barcikowski, E. (Author)
Belz, J. W. (Author)
Bergman, D. R. (Author)
Blake, S. A. (Author)
Lundquist, Jon Paul (Author)
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Work type:Unknown ()
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
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
Year of publishing:2020
Number of pages:str. 1-5
Numbering:no. 2, Vol. 8989
COBISS_ID:50454275 Link is opened in a new window
ISSN on article:2041-8205
DOI:10.3847/2041-8213/aba0bc Link is opened in a new window
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Title:The astrophysical journal
Publisher:IOP Publishing
COBISS.SI-ID:2468603 New window