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Title: CORRELATIONS OF THE ARRIVAL DIRECTIONS OF ULTRA-HIGH ENERGY COSMIC RAYS WITH EXTRAGALACTIC OBJECTS AS OBSERVED BY THE TELESCOPE ARRAY EXPERIMENT

We search for correlations between the positions of extragalactic objects and the arrival directions of ultra-high energy cosmic rays (UHECRs) with primary energy E ≥ 40 EeV as observed by the surface detector array of the Telescope Array (TA) experiment during the first 40 months of operation. We examine several public astronomical object catalogs, including the Veron-Cetty and Veron catalog of active galactic nuclei. We count the number of TA events correlated with objects in each catalog as a function of three parameters: the maximum angular separation between a TA event and an object, the minimum energy of the events, and the maximum redshift of the objects. We determine the combination of these parameters that maximizes the correlations, and we calculate the probability of having the same levels of correlations from an isotropic distribution of UHECR arrival directions. No statistically significant correlations are found when penalties for scanning over the above parameters and for searching in several catalogs are taken into account.
Authors:
; ; ; ; ; ; ; ;  [1] ;  [2] ; ;  [3] ; ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] more »; « less
  1. High Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, UT (United States)
  2. Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Kofu, Yamanashi (Japan)
  3. Graduate School of Science and Engineering, Tokyo Institute of Technology, Meguro, Tokyo (Japan)
  4. Department of Physics and The Research Institute of Natural Science, Hanyang University, Seongdong-gu, Seoul (Korea, Republic of)
  5. Department of Physics, Tokyo University of Science, Noda, Chiba (Japan)
  6. Department of Physics, Kinki University, Higashi Osaka, Osaka (Japan)
  7. Department of Physics, Yonsei University, Seodaemun-gu, Seoul (Korea, Republic of)
  8. Institute of Particle and Nuclear Studies, KEK, Tsukuba, Ibaraki (Japan)
  9. Graduate School of Science, Osaka City University, Osaka (Japan)
  10. Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba (Japan)
Publication Date:
OSTI Identifier:
22270655
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 777; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; ASTRONOMY; ASTROPHYSICS; CORRELATIONS; COSMIC RADIATION; COSMIC RAY DETECTION; EEV RANGE; GALAXY NUCLEI; RED SHIFT; TELESCOPE COUNTERS