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Volume 358 - 36th International Cosmic Ray Conference (ICRC2019) - CRI - Cosmic Ray Indirect
Updated Results on the UHECR Hotspot Observed by the Telescope Array Experiment
K. Kawata,* A. di Matteo, T. Fujii, D. Ikeda, D. Ivanov, C. C. H. Jui, E. Kido, J.P. Lundquist, J. N. Matthews, S. Nagataki, T. Nonaka, S. Ogio, T. Okuda, G. Rubtsov, H. Sagawa, T.K. Sako, N. Sakurai, M. Takeda, R. Takeishi, A. Taketa, G. B. Thomson, P. Tinyakov, I. Tkachev, S. Troitsky, T. Telescope Array Collaboration
*corresponding author
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Pre-published on: 2019 July 22
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The Telescope Array Experiment has observed an indication of intermediate-scale anisotropy in the UHECR arrival directions, called the Hotspot, with $E>57$ EeV around the Ursa Major using the first 5-year data during a period between May 2008 and May 2013 collected by the TA surface detector array. The chance probability of this hotspot in an isotropic cosmic-ray sky was calculated to be 3.4$\sigma$ (post trial). In this paper, we will report on an update of this result using the 11-year data collected by the TA surface detectors with more than doubled exposure since the first publication.
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