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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:ID Abbasi, R.U. (Author)
ID Lundquist, Jon Paul (Author), et al.
Files:.pdf Abbasi_2018_ApJ_862_91.pdf (1,43 MB)
MD5: 7489D401FA779F1F48AC50E350514436
Work type:Not categorized
Typology: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
Publication version:Version of Record
Year of publishing:2018
Number of pages:6
Numbering:91, 862
PID:20.500.12556/RUNG-5144-624281a5-fd40-c696-e5f4-c750501b7014 New window
COBISS.SI-ID:5616379 New window
DOI:10.3847/1538-4357/aac9c8 New window
Publication date in RUNG:24.04.2020
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Record is a part of a journal

Title:The Astrophysical Journal
Year of publishing:2018


License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
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:24.04.2020