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We search for correlations between positions of extragalactic objects andarrival directions of Ultra-High Energy Cosmic Rays (UHECRs) with primaryenergy $E \ge 40$ EeV as observed by the surface detector array of theTelescope Array (TA) experiment during the first 40 months of operation. Weexamined several public astronomical object catalogs, including the Veron-Cettyand Veron catalog of active galactic nuclei. We counted the number of TA eventscorrelated with objects in each catalog as a function of three parameters: themaximum angular separation between a TA event and an object, the minimum energyof the events, and the maximum redshift of the objects. We determinecombinations of these parameters which maximize the correlations, and calculatethe chance probabilities of having the same levels of correlations from anisotropic distribution of UHECR arrival directions. No statisticallysignificant correlations are found when penalties for scanning over the aboveparameters and for searching in several catalogs are taken into account.

astrophysical journal/the astrophysical journal

Search for correlations of the arrival directions of ultra-high energy  cosmic ray with extragalactic objects as observed by the telescope array  experiment