ヒビノ キンヤ   Hibino Kinya
  日比野 欣也
   所属   神奈川大学  工学部 物理学教室
   職種   教授
言語種別 日本語
発行・発表の年月 2014/08
形態種別 学術雑誌
査読 査読あり
標題 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
執筆形態 共著
掲載誌名 The Astrophysical Journal Letters
巻・号・頁 Vol. 790, L21
著者・共著者 R. U. Abbasi, et al.
概要 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).