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Search for EeV protons of galactic originopen access

Authors
Abbasi, Rasha U.Abe, M.Abu-Zayyad, TareqAllen, Monica G.Azuma, RyujiBarcikowski, E.Belz, John W.Bergman, Douglas R.Blake, Simon A.Cady, R.Cheon, ByungguChiba, JoeChikawa, M.Fujii, T.Fukushima, M.Goto, T.Hanlon, W.Hayashi, Y.Hayashi, M.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, E.Kalashev, K.Kasahara, K.Kawai, H.Kawakami, S.Kawana, S.Kawata, K.Kido, E.Kim, H. B.Kim, J. H.Kim, J. H.Kishigami, S.Kitamura, S.Kitamura, Y.Kuzmin, V.Kwon, Y. J.Lan, J.Lubsandorzhiev, B.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.Onogi, R.Oshima, A.Ozawa, S.Park, I. H.Pshirkov, M. S.Rodriguez, D. C.Rubtsov, G.Ryu, D.Sagawa, H.Saito, K.Saito, Y.Sakaki, N.Sakurai, N.Scott, L. M.Sekino, K.Shah, P. D.Shibata, T.Shibata, F.Shimodaira, H.Shin, B. K.Shin, H. S.Smith, J. D.Sokolsky, P.Stokes, B. T.Stratton, S. R.Stroman, T. A.Suzawa, T.Takahashi, Y.Takamura, M.Takeda, M.Takeishi, R.Taketa, A.Takita, M.Tameda, Y.Tanaka, M.Tanaka, K.Tanakai, H.Thomas, S. B.Thomson, G. B.Tinyakov, P.Tirone, A. H.Tkachev, I.Tokuno, H.Tomida, T.Troitsky, S.Tsunesada, Y.Tsutsumi, K.Uchihori, Y.Udo, S.Urban, F.Wong, T.Yamane, R.Yamaoka, H.Yamazaki, K.Yang, J.Yashiro, K.Yoneda, Y.Yoshida, S.Yoshii, H.Zollinger, R.Zundel, Z.
Issue Date
Jan-2017
Publisher
ELSEVIER SCIENCE BV
Keywords
Cosmic ray; Galactic protons; Telescope array; Surface detector
Citation
ASTROPARTICLE PHYSICS, v.86, pp.21 - 26
Indexed
SCIE
SCOPUS
Journal Title
ASTROPARTICLE PHYSICS
Volume
86
Start Page
21
End Page
26
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/153057
DOI
10.1016/j.astropartphys.2016.11.001
ISSN
0927-6505
Abstract
Cosmic rays in the energy range 10(18.0)-10(18.5) eV are thought to have a light, probably protonic, composition. To study their origin one can search for anisotropy in their arrival directions. Extragalactic cosmic rays should be isotropic, but galactic cosmic rays of this type should be seen mostly along the galactic plane, and there should be a shortage of events coming from directions near the galactic anticenter. This is due to the fact that, under the influence of the galactic magnetic field, the transition from ballistic to diffusive behavior is well advanced, and this qualitative picture persists over the whole energy range. Guided by models of the galactic magnetic field that indicate that the enhancement along the galactic plane should have a standard deviation of about 20 degrees in galactic latitude, and the deficit in the galactic anticenter direction should have a standard deviation of about 50 degrees in galactic longitude, we use the data of the Telescope Array surface detector in 10(18.0) to 10(18.5) eV energy range to search for these effects. The data are isotropic. Neither an enhancement along the galactic plane nor a deficit in the galactic anticenter direction is found. Using these data we place an upper limit on the fraction of EeV cosmic rays of galactic origin at 1.3% at 95% confidence level.
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