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Title:Testing a Reported Correlation between Arrival Directions of Ultra-high-energy Cosmic Rays and a Flux Pattern from nearby Starburst Galaxies using Telescope Array Data
Authors:ID Abbasi, R.U. (Author)
ID Lundquist, Jon Paul, UNG (Author), et al.
Files:.pdf Abbasi_2018_ApJL_867_L27.pdf (700,72 KB)
MD5: AF65824CAD7E4854CB19ED58DC9A637F
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:The Pierre Auger Collaboration (Auger) recently reported a correlation between the arrival directions of cosmic rays with energies above 39 EeV and the flux pattern of 23 nearby starburst galaxies (SBGs). In this Letter, we tested the same hypothesis using cosmic rays detected by the Telescope Array experiment (TA) in the 9-year period from May 2008 to May 2017. Unlike the Auger analysis, we did not optimize the parameter values but kept them fixed to the best-fit values found by Auger, namely 9.7% for the anisotropic fraction of cosmic rays assumed to originate from the SBGs in the list and 12.9◦ for the angular scale of the correlations. The energy threshold we adopted is 43 EeV, corresponding to 39 EeV in Auger when taking into account the energy-scale difference between two experiments. We find that the TA data is compatible with isotropy to within 1.1σ and with the Auger result to within 1.4σ, meaning that it is not capable to discriminate between these two hypotheses.
Keywords:astroparticle physics, cosmic rays, galaxies: starburst, methods: data analysis
Publication version:Version of Record
Year of publishing:2018
Number of pages:5
Numbering:2, 867
PID:20.500.12556/RUNG-5149-16b3545b-c2b0-fafb-65ea-7df64dfd4591 New window
COBISS.SI-ID:12824579 New window
DOI:10.3847/2041-8213/aaebf9 New window
Publication date in RUNG:27.04.2020
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Record is a part of a journal

Title:The Astrophysical Journal Letters
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:27.04.2020