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Ryu, Dongsu
Astrophysics Lab
Research Interests
  • Shock waves and turbulence in clusters of galaxies
  • Origin and evolution of magnetic fields and cosmic rays in the universe
  • Plasma astrophysical phenomena in the large-scale structure of the universe

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Indications of intermediate-scale anisotropy of cosmic rays with energy greater than 57 EeV in the northern sky measured with the surface detector of the Telescope Array experiment

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Title
Indications of intermediate-scale anisotropy of cosmic rays with energy greater than 57 EeV in the northern sky measured with the surface detector of the Telescope Array experiment
Author
Abbasi R.U.Abe M.Abu-Zayyad T.Allen M.Anderson R.Azuma R.Barcikowski E.Belz J.W.Bergman D.R.Blake S.A.Cady R.Chae M.J.Cheon B.G.Chiba J.Chikawa M.Cho W.R.Fujii T.Fukushima M.Goto T.Hanlon W.Hayashi Y.Hayashida N.Hibino K.Honda K.Ikeda D.Inoue N.Ishii T.Ishimori R.Ito H.Ivanov D.Jui C.C.H.Kadota K.Kakimoto F.Kalashev O.Kasahara K.Kawai H.Kawakami S.Kawana S.Kawata K.Kido E.Kim H.B.Kim J.H.Kim J.H.Kitamura S.Kitamura Y.Kuzmin V.Kwon Y.J.Lan J.Lim S.I.Lundquist J.P.Machida K.Martens K.Matsuda T.Matsuyama T.Matthews J.N.Minamino M.Mukai K.Myers I.Nagasawa K.Nagataki S.Nakamura T.Nonaka T.Nozato A.Ogio S.Ogura J.Ohnishi M.Ohoka H.Oki K.Okuda T.Ono M.Oshima A.Ozawa S.Park I.H.Pshirkov M.S.Rodriguez D.C.Rubtsov G.Ryu, DongsuSagawa H.Sakurai N.Sampson A.L.Scott L.M.Shah P.D.Shibata F.Shibata T.Shimodaira H.Shin B.K.Smith J.D.Sokolsky P.Springer R.W.Stokes B.T.Stratton S.R.Stroman T.A.Suzawa T.Takamura M.Takeda M.Takeishi R.Taketa A.Takita M.Tameda Y.Tanaka H.Tanaka K.Tanaka M.Thomas S.B.Thomson G.B.Tinyakov P.Tkachev I.Tokuno H.Tomida T.Troitsky S.Tsunesada Y.Tsutsumi K.Uchihori Y.Udo S.Urban F.Vasiloff G.Wong T.Yamane R.Yamaoka H.Yamazaki K.Yang J.Yashiro K.Yoneda Y.Yoshida S.Yoshii H.Zollinger R.Zundel Z.
Keywords
acceleration of particles; cosmic rays; large-scale structure of universe; surveys
Issue Date
2014-08
Publisher
IOP PUBLISHING LTD
Citation
ASTROPHYSICAL JOURNAL LETTERS, v.790, no.2, pp.1 - 5
Abstract
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° radius circles. The hotspot has a Li-Ma statistical significance of 5.1σ, and is centered at R.A. = 146.°7, decl. = 43.°2. The position of the hotspot is about 19° off of the supergalactic plane. The probability of a cluster of events of 5.1σ significance, appearing by chance in an isotropic cosmic-ray sky, is estimated to be 3.7 × 10-4 (3.4σ).
URI
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DOI
10.1088/2041-8205/790/2/L21
ISSN
2041-8205
Appears in Collections:
PHY_Journal Papers
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