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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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A NORTHERN SKY SURVEY FOR POINT-LIKE SOURCES OF EeV NEUTRAL PARTICLES WITH THE TELESCOPE ARRAY EXPERIMENT

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Title
A NORTHERN SKY SURVEY FOR POINT-LIKE SOURCES OF EeV NEUTRAL PARTICLES WITH 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.
Issue Date
2015-05
Publisher
IOP PUBLISHING LTD
Citation
ASTROPHYSICAL JOURNAL, v.804, no.2, pp.1 - 11
Abstract
We report on the search for steady point-like sources of neutral particles around 10(18) eV between 2008 and 2013 May with the scintillator SD of the Telescope Array experiment. We found overall no significant point-like excess above 0.5 EeV in the northern sky. Subsequently, we also searched for coincidence with the Fermi bright Galactic sources. No significant coincidence was found within the statistical uncertainty. Hence, we set an upper limit on the neutron flux that corresponds to an averaged flux of 0.07 km(-2) yr(-1) for E > 1 EeV in the northern sky at the 95% confidence level. This is the most stringent flux upper limit in a northern sky survey assuming point-like sources. The upper limit at the 95% confidence level on the neutron flux from Cygnus X-3 is also set to 0.2 km(-2) yr(-1) for E > 0.5 EeV. This is an order of magnitude lower than previous flux measurements
URI
https://scholarworks.unist.ac.kr/handle/201301/17390
URL
http://iopscience.iop.org/article/10.1088/0004-637X/804/2/133/meta;jsessionid=5C0BF64CCE71BD8F4D26867E4DAAFAA4.c1
DOI
10.1088/0004-637X/804/2/133
ISSN
0004-637X
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