期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 790, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/790/2/L21
关键词
acceleration of particles; cosmic rays; large-scale structure of universe; surveys
资金
- Japan Society for the Promotion of Science Extreme Phenomena in the Universe Explored by Highest Energy Cosmic Rays [21000002]
- Inter-University Research Program of the Institute for Cosmic Ray Research
- U.S. National Science Foundation [PHY-0307098, PHY-0601915, PHY-0649681, PHY-0703893, PHY-0758342, PHY-0848320, PHY-1069280, PHY-1069286]
- National Research Foundation of Korea [2007-0093860, R32-10130, 2012R1A1A2008381, 2013004883]
- Russian Academy of Sciences, RFBR [11-02-01528a, 13-02-01311a]
- IISN [4.4509.10]
- Belgian Science Policy under IUAP [VII/37]
- Grants-in-Aid for Scientific Research [21000002, 25800128] Funding Source: KAKEN
- National Research Foundation of Korea [2012R1A1A2008381] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Division Of Physics
- Direct For Mathematical & Physical Scien [1069286, 1404502] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1404495, 1069280] Funding Source: National Science Foundation
We have searched for intermediate-scale anisotropy in the arrival directions of ultrahigh-energy cosmic rays with energies above 57 EeV in the northern sky using data collected over a 5 yr period by the surface detector of the Telescope Array experiment. We report on a cluster of events that we call the hotspot, found by oversampling using 20 degrees radius circles. The hotspot has a Li-Ma statistical significance of 5.1 sigma, and is centered at R. A. = 146 degrees 7, decl. = 43 degrees 2. The position of the hotspot is about 19 degrees off of the supergalactic plane. The probability of a cluster of events of 5.1 sigma significance, appearing by chance in an isotropic cosmic-ray sky, is estimated to be 3.7 x 10(-4) (3.4 sigma).
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