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Search for anisotropy of ultrahigh energy cosmic rays with the telescope array experiment

Title
Search for anisotropy of ultrahigh energy cosmic rays with the telescope array experiment
Authors
Abu-Zayyad T.Aida R.Allen M.Anderson R.Azuma R.Barcikowski E.Belz J.W.Bergman D.R.Blake S.A.Cady R.Cheon B.G.Chiba J.Chikawa M.Cho E.J.Cho W.R.Fujii H.Fujii T.Fukuda T.Fukushima M.Hanlon W.Hayashi K.Hayashi Y.Hayashida N.Hibino K.Hiyama K.Honda K.Iguchi T.Ikeda D.Ikuta K.Inoue N.Ishii T.Ishimori R.Ivanov D.Iwamoto S.Jui C.C.H.Kadota K.Kakimoto F.Kalashev O.Kanbe T.Kasahara K.Kawai H.Kawakami S.Kawana S.Kido E.Kim H.B.Kim H.K.Kim J.H.Kitamoto K.Kitamura S.Kitamura Y.Kobayashi K.Kobayashi Y.Kondo Y.Kuramoto K.Kuzmin V.Kwon Y.J.Lim S.I.MacHida S.Martens K.Martineau J.Matsuda T.Matsuura T.Matsuyama T.Matthews J.N.Minamino M.Miyata K.Murano Y.Myers I.Nagasawa K.Nagataki S.Nakamura T.Nam S.W.Nonaka T.Ogio S.Ohnishi M.Ohoka H.Oki K.Oku D.Okuda T.Oshima A.Ozawa S.Park I.H.Pshirkov M.S.Rodriguez D.C.Roh S.Y.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.Shin J.I.Shirahama T.Smith J.D.Sokolsky P.Sonley T.J.Springer R.W.Stokes B.T.Stratton S.R.Stroman T.Suzuki S.Takahashi Y.Takeda M.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.Tsuyuguchi Y.Uchihori Y.Udo S.Ukai H.Vasiloff G.Wada Y.Wong T.Wood M.Yamakawa Y.Yamane R.Yamaoka H.Yamazaki K.Yang J.Yoneda Y.Yoshida S.Yoshii H.Zhou X.Zollinger R.Zundel Z.
Ewha Authors
양종만박일흥남신우
SCOPUS Author ID
양종만scopus
Issue Date
2012
Journal Title
Astrophysical Journal
ISSN
0004-637XJCR Link
Citation
vol. 757, no. 1
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We study the anisotropy of Ultra-High Energy Cosmic Ray (UHECR) events collected by the Telescope Array (TA) detector in the first 40 months of operation. Following earlier studies, we examine event sets with energy thresholds of 10EeV, 40EeV, and 57EeV. We find that the distributions of the events in right ascension and declination are compatible with an isotropic distribution in all three sets. We then compare with previously reported clustering of the UHECR events at small angular scales. No significant clustering is found in the TA data. We then check the events with E > 57EeV for correlations with nearby active galactic nuclei. No significant correlation is found. Finally, we examine all three sets for correlations with the large-scale structure (LSS) of the universe. We find that the two higher-energy sets are compatible with both an isotropic distribution and the hypothesis that UHECR sources follow the matter distribution of the universe (the LSS hypothesis), while the event set with E > 10EeV is compatible with isotropy and is not compatible with the LSS hypothesis at 95% CL unless large deflection angles are also assumed. We show that accounting for UHECR deflections in a realistic model of the Galactic magnetic field can make this set compatible with the LSS hypothesis. © 2012. The American Astronomical Society. All rights reserved..
DOI
10.1088/0004-637X/757/1/26
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자연과학대학 > 물리학전공 > Journal papers
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