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Ultra-high-energy cosmic-ray hotspot observed with the telescope array surface detectors

par Kawata, K.;Rubtsov, Grigory;Sagawa, Hiroyuki;Sakurai, Nobuyuki;Stokes, Benjamin B.T.;Takeda, Masahiro;Takeishi, R.;Taketa, Akimichi;Thomson, Gordon;Tiniakov, Petr ;Tkachev, Igor;Fukushima, Masaki;Tokuno, Hisao;Ikeda, Daisuke;Ivanov, Dmitry;Kido, Eiji;Matthews, John J.N.;Nagataki, Shigehiro;Nonaka, Toshiyuki;Okuda, Takeshi
Référence Pos proceedings of science, 30-July-2015, 276
Publication Publié, 2015

Article révisé par les pairs

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Résumé :

The Telescope Array (TA) collaboration has reported on an indication of the excess flux of ultra- high energy cosmic rays (UHECRs) with E > 57 EeV, located near the Ursa Major cluster [1]. Corresponding sky region was called the 'hotspot'. In the present work we test this result using the latest data collected by the TA SD array. As a result, the number of events in the hotspot increases to 24, while expected background is 6.88 with the first 5-year and the additional 2-year data. The statistical significance of the hotspot for the seven year dataset remains at the same level of 3.4s as for 5 year initial sample.