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Title:Evidence of Intermediate-scale Energy Spectrum Anisotropy of Cosmic Rays E ≥ 10^19.2 eV with the Telescope Array Surface Detector
Authors:Abbasi, R.U. (Author)
Lundquist, J. P. (Author)
et al.
Files:.pdf Abbasi_2018_ApJ_862_91.pdf (1,43 MB)
 
Language:English
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Evidence for an intermediate-scale energy spectrum anisotropy has been found in the arrival directions of ultra-high energy cosmic rays for energies greater than 10^19.2 eV in the northern hemisphere using 7 years of Telescope Array surface detector data. A relative energy distribution test is done comparing events inside oversampled spherical caps of equal exposure, to those outside, using the Poisson likelihood ratio. The center of maximum significance is at 9h16m, 45°, and has a deficit of events with energies 10^19.2 ≤ E < 10^19.75 eV and an excess for E ≥ 10^19.75 eV. The post-trial probability of this energy anisotropy, appearing by chance anywhere on an isotropic sky, is found by Monte Carlo simulation to be 9 × 10−5 (3.74σ global).
Keywords:astroparticle physics, cosmic rays, anisotropy, large-scale structure of universe
Year of publishing:2018
Number of pages:6
Numbering:862, 91
COBISS_ID:5616379 Link is opened in a new window
URN:URN:SI:UNG:REP:84VDGRT8
DOI:10.3847/1538-4357/aac9c8 Link is opened in a new window
License:CC BY-NC-ND 4.0
This work is available under this license: Creative Commons Attribution Non-Commercial No Derivatives 4.0 International
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Title:The Astrophysical Journal
Year of publishing:2018

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