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

R. U. Abbasi, M. Abe, T. Abu-Zayyad, M. Allen, R. Anderson, R. Azuma, E. Barcikowski, J. W. Belz, D. R. Bergman, S. A. Blake, R. Cady, M. J. Chae, B. G. Cheon, J. Chiba, M. Chikawa, W. R. Cho, T. Fujii, M. Fukushima, T. Goto, W. HanlonY. Hayashi, N. Hayashida, K. Hibino, K. Honda, D. Ikeda, N. Inoue, T. Ishii, R. Ishimori, H. Ito, D. Ivanov, C. C H Jui, K. Kadota, F. Kakimoto, O. Kalashev, K. Kasahara, H. Kawai, S. Kawakami, S. Kawana, K. Kawata, E. Kido, H. B. Kim, J. H. Kim, J. H. Kim, S. Kitamura, Y. Kitamura, V. Kuzmin, Y. J. Kwon, J. Lan, S. I. Lim, J. P. Lundquist, K. Machida, K. Martens, T. Matsuda, T. Matsuyama, J. N. Matthews, M. Minamino, K. Mukai, I. Myers, K. Nagasawa, S. Nagataki, T. Nakamura, T. Nonaka, A. Nozato, S. Ogio, J. Ogura, M. Ohnishi, H. Ohoka, K. Oki, T. Okuda, M. Ono, A. Oshima, Shunsuke Ozawa, I. H. Park, M. S. Pshirkov, D. C. Rodriguez, G. Rubtsov, D. Ryu, H. Sagawa, N. Sakurai, A. L. Sampson, L. M. Scott, P. D. Shah, F. Shibata, T. Shibata, H. Shimodaira, B. K. Shin, J. D. Smith, P. Sokolsky, R. W. Springer, B. T. Stokes, S. R. Stratton, T. A. Stroman, T. Suzawa, M. Takamura, M. Takeda, R. Takeishi, A. Taketa, M. Takita, Y. Tameda, H. Tanaka, K. Tanaka, M. Tanaka, S. B. Thomas, G. B. Thomson, P. Tinyakov, I. Tkachev, H. Tokuno, T. Tomida, S. Troitsky, Y. Tsunesada, K. Tsutsumi, Y. Uchihori, S. Udo, F. Urban, G. Vasiloff, T. Wong, R. Yamane, H. Yamaoka, K. Yamazaki, J. Yang, K. Yashiro, Y. Yoneda, S. Yoshida, H. Yoshii, R. Zollinger, Z. Zundel

Research output: Contribution to journalArticle

145 Citations (Scopus)

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).

Original languageEnglish
Article numberL21
JournalAstrophysical Journal Letters
Volume790
Issue number2
DOIs
Publication statusPublished - 2014 Aug 1

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northern sky
cosmic ray
cosmic rays
indication
anisotropy
telescopes
detectors
arrivals
energy
sky
experiment
radii
detector

Keywords

  • acceleration of particles
  • cosmic rays
  • large-scale structure of universe
  • surveys

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

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. / 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, Shunsuke; Park, I. H.; Pshirkov, M. S.; Rodriguez, D. C.; Rubtsov, G.; Ryu, D.; Sagawa, 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.

In: Astrophysical Journal Letters, Vol. 790, No. 2, L21, 01.08.2014.

Research output: Contribution to journalArticle

Abbasi, RU, Abe, M, Abu-Zayyad, T, Allen, M, Anderson, R, Azuma, R, Barcikowski, E, Belz, JW, Bergman, DR, Blake, SA, Cady, R, Chae, MJ, Cheon, BG, Chiba, J, Chikawa, M, Cho, WR, 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, CCH, Kadota, K, Kakimoto, F, Kalashev, O, Kasahara, K, Kawai, H, Kawakami, S, Kawana, S, Kawata, K, Kido, E, Kim, HB, Kim, JH, Kim, JH, Kitamura, S, Kitamura, Y, Kuzmin, V, Kwon, YJ, Lan, J, Lim, SI, Lundquist, JP, Machida, K, Martens, K, Matsuda, T, Matsuyama, T, Matthews, JN, 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, IH, Pshirkov, MS, Rodriguez, DC, Rubtsov, G, Ryu, D, Sagawa, H, Sakurai, N, Sampson, AL, Scott, LM, Shah, PD, Shibata, F, Shibata, T, Shimodaira, H, Shin, BK, Smith, JD, Sokolsky, P, Springer, RW, Stokes, BT, Stratton, SR, Stroman, TA, Suzawa, T, Takamura, M, Takeda, M, Takeishi, R, Taketa, A, Takita, M, Tameda, Y, Tanaka, H, Tanaka, K, Tanaka, M, Thomas, SB, Thomson, GB, 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 2014, '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', Astrophysical Journal Letters, vol. 790, no. 2, L21. https://doi.org/10.1088/2041-8205/790/2/L21
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, Shunsuke ; Park, I. H. ; Pshirkov, M. S. ; Rodriguez, D. C. ; Rubtsov, G. ; Ryu, D. ; Sagawa, 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. / 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. In: Astrophysical Journal Letters. 2014 ; Vol. 790, No. 2.
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T1 - 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

AU - Abbasi, R. U.

AU - Abe, M.

AU - Abu-Zayyad, T.

AU - Allen, M.

AU - Anderson, R.

AU - Azuma, R.

AU - Barcikowski, E.

AU - Belz, J. W.

AU - Bergman, D. R.

AU - Blake, S. A.

AU - Cady, R.

AU - Chae, M. J.

AU - Cheon, B. G.

AU - Chiba, J.

AU - Chikawa, M.

AU - Cho, W. R.

AU - Fujii, T.

AU - Fukushima, M.

AU - Goto, T.

AU - Hanlon, W.

AU - Hayashi, Y.

AU - Hayashida, N.

AU - Hibino, K.

AU - Honda, K.

AU - Ikeda, D.

AU - Inoue, N.

AU - Ishii, T.

AU - Ishimori, R.

AU - Ito, H.

AU - Ivanov, D.

AU - Jui, C. C H

AU - Kadota, K.

AU - Kakimoto, F.

AU - Kalashev, O.

AU - Kasahara, K.

AU - Kawai, H.

AU - Kawakami, S.

AU - Kawana, S.

AU - Kawata, K.

AU - Kido, E.

AU - Kim, H. B.

AU - Kim, J. H.

AU - Kim, J. H.

AU - Kitamura, S.

AU - Kitamura, Y.

AU - Kuzmin, V.

AU - Kwon, Y. J.

AU - Lan, J.

AU - Lim, S. I.

AU - Lundquist, J. P.

AU - Machida, K.

AU - Martens, K.

AU - Matsuda, T.

AU - Matsuyama, T.

AU - Matthews, J. N.

AU - Minamino, M.

AU - Mukai, K.

AU - Myers, I.

AU - Nagasawa, K.

AU - Nagataki, S.

AU - Nakamura, T.

AU - Nonaka, T.

AU - Nozato, A.

AU - Ogio, S.

AU - Ogura, J.

AU - Ohnishi, M.

AU - Ohoka, H.

AU - Oki, K.

AU - Okuda, T.

AU - Ono, M.

AU - Oshima, A.

AU - Ozawa, Shunsuke

AU - Park, I. H.

AU - Pshirkov, M. S.

AU - Rodriguez, D. C.

AU - Rubtsov, G.

AU - Ryu, D.

AU - Sagawa, H.

AU - Sakurai, N.

AU - Sampson, A. L.

AU - Scott, L. M.

AU - Shah, P. D.

AU - Shibata, F.

AU - Shibata, T.

AU - Shimodaira, H.

AU - Shin, B. K.

AU - Smith, J. D.

AU - Sokolsky, P.

AU - Springer, R. W.

AU - Stokes, B. T.

AU - Stratton, S. R.

AU - Stroman, T. A.

AU - Suzawa, T.

AU - Takamura, M.

AU - Takeda, M.

AU - Takeishi, R.

AU - Taketa, A.

AU - Takita, M.

AU - Tameda, Y.

AU - Tanaka, H.

AU - Tanaka, K.

AU - Tanaka, M.

AU - Thomas, S. B.

AU - Thomson, G. B.

AU - Tinyakov, P.

AU - Tkachev, I.

AU - Tokuno, H.

AU - Tomida, T.

AU - Troitsky, S.

AU - Tsunesada, Y.

AU - Tsutsumi, K.

AU - Uchihori, Y.

AU - Udo, S.

AU - Urban, F.

AU - Vasiloff, G.

AU - Wong, T.

AU - Yamane, R.

AU - Yamaoka, H.

AU - Yamazaki, K.

AU - Yang, J.

AU - Yashiro, K.

AU - Yoneda, Y.

AU - Yoshida, S.

AU - Yoshii, H.

AU - Zollinger, R.

AU - Zundel, Z.

PY - 2014/8/1

Y1 - 2014/8/1

N2 - 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).

AB - 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).

KW - acceleration of particles

KW - cosmic rays

KW - large-scale structure of universe

KW - surveys

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UR - http://www.scopus.com/inward/citedby.url?scp=84904703537&partnerID=8YFLogxK

U2 - 10.1088/2041-8205/790/2/L21

DO - 10.1088/2041-8205/790/2/L21

M3 - Article

AN - SCOPUS:84904703537

VL - 790

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

SN - 2041-8205

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