Main Image
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
Full text: pdf
Pre-published on: 2019 July 22
Published on:
Abstract
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.
Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.