Evidence of Intermediate-scale Energy Spectrum Anisotropy of Cosmic Rays E >= 10(19.2)eV with the Telescope Array Surface Detector

Evidence of Intermediate-scale Energy Spectrum Anisotropy of Cosmic Rays e ≥ 1019.2 eV with the Telescope Array Surface Detector
  • Abbasi, R. U.
  • Abe, M.
  • Abu-Zayyad, T.
  • Allen, M.
  • Azuma, R.
  • ... Kim, H. B.
  • 외 133명
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초록

Evidence for an intermediate-scale energy spectrum anisotropy has been found in the arrival directions of ultra-high energy cosmic rays for energies greater than 10(19.2) eV in the northern hemisphere using 7 years of Telescope Array surface detector data. A relative energy distribution test is done comparing events inside oversampled spherical caps of equal exposure, to those outside, using the Poisson likelihood ratio. The center of maximum significance is at 9(h)16(m), 45 degrees, and has a deficit of events with energies 10(19.2) <= E < 10(19.75) eV and an excess for E >= 10(19.75) eV. The post-trial probability of this energy anisotropy, appearing by chance anywhere on an isotropic sky, is found by Monte Carlo simulation to be 9 x 10(-5) (3.74 sigma(global)).

키워드

astroparticle physicscosmic rayslarge-scale structure of universeMAGNETIC-FIELDSASTRONOMY
제목
Evidence of Intermediate-scale Energy Spectrum Anisotropy of Cosmic Rays E >= 10(19.2)eV with the Telescope Array Surface Detector
제목 (타언어)
Evidence of Intermediate-scale Energy Spectrum Anisotropy of Cosmic Rays e ≥ 1019.2 eV with the Telescope Array Surface Detector
저자
Abbasi, R. U.Abe, M.Abu-Zayyad, T.Allen, M.Azuma, R.Barcikowski, E.Belz, J. W.Bergman, D. R.Blake, S. A.Cady, R.Cheon, B. G.Chiba, J.Chikawa, M.Di Matteo, A.Fujii, T.Fujita, K.Fukushima, M.Furlich, G.Goto, T.Hanlon, W.Hayashi, M.Hayashi, Y.Hayashida, N.Hibino, K.Honda, K.Ikeda, D.Inoue, N.Ishii, T.Ishimori, R.Ito, H.Ivanov, D.Jeong, H. M.Jeong, S.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.Kishigami, S.Kitamura, S.Kitamura, Y.Kuzmin, VKuznetsov, M.Kwon, Y. J.Lee, K. H.Lubsandorzhiev, B.Lundquist, J. P.Machida, K.Martens, K.Matsuyama, T.Matthews, J. N.Mayta, R.Minamino, M.Mukai, K.Myers, INagasawa, K.Nagataki, S.Nakamura, R.Nakamura, T.Nonaka, T.Nozato, A.Oda, H.Ogio, S.Ogura, J.Ohnishi, M.Ohoka, H.Okuda, T.Omura, Y.Ono, M.Onogi, R.Oshima, A.Ozawa, S.Park, I. H.Pshirkov, M. S.Rodriguez, D. C.Rubtsov, G.Ryu, D.Sagawa, H.Sahara, R.Saito, K.Saito, Y.Sakaki, N.Sakurai, N.Scott, L. M.Seki, T.Sekino, K.Shah, P. D.Shibata, F.Shibata, T.Shimodaira, H.Shin, B. K.Shin, H. S.Smith, J. D.Sokolsky, P.Stokes, B. T.Stratton, S. R.Stroman, T. A.Suzawa, T.Takagi, Y.Takahashi, Y.Takamura, M.Takeishi, R.Taketa, A.Takita, M.Tameda, Y.Tanaka, H.Tanaka, K.Tanaka, M.Thomas, S. B.Thomson, G. B.Tinyakov, P.Tkachev, ITokuno, H.Tomida, T.Troitsky, S.Tsunesada, Y.Tsutsumi, K.Uchihori, Y.Udo, S.Urban, F.Wong, T.Yamamoto, M.Yamane, R.Yamaoka, H.Yamazaki, K.Yang, J.Yashiro, K.Yoneda, Y.Yoshida, S.Yoshii, H.Zhezher, Y.Zundel, Z.
DOI
10.3847/1538-4357/aac9c8
발행일
2018-08
유형
Article
저널명
Astrophysical Journal
862
2