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The Pierre Auger Collaboration (Auger) recently reported a correlationbetween the arrival directions of cosmic rays with energies above 39 EeV andthe flux pattern of 23 nearby starburst galaxies (SBGs). In this Letter, wetested the same hypothesis using cosmic rays detected by the Telescope Arrayexperiment (TA) in the 9-year period from May 2008 to May 2017. Unlike theAuger analysis, we did not optimize the parameter values but kept them fixed tothe best-fit values found by Auger, namely 9.7% for the anisotropic fraction ofcosmic rays assumed to originate from the SBGs in the list and 12.9{\deg} forthe angular scale of the correlations. The energy threshold we adopted is 43EeV, corresponding to 39 EeV in Auger when taking into account the energy-scaledifference between two experiments. We find that the TA data is compatible withisotropy to within 1.1{\sigma} and with the Auger result to within 1.4{\sigma},meaning that it is not capable to discriminate between these two hypotheses.

the astrophysical journal. letters

Testing a reported correlation between arrival directions of  ultrahigh-energy cosmic rays and a flux pattern from nearby starburst  galaxies using Telescope Array data