S. Nagataki

TA Anisotropy Summary

The Telescope Array has collected 7 years of data. We make use of these data to search for large- and small-scale anisotropy of UHECR. At small angular scales we examine the data for clustering of events and correlations with some classes of putative sources. At large angular scales we present an update of the search for localized excesses by the oversampling method previously performed with the 5-year data set [1], and examine the data for correlations with the LSS of the Universe. We confirm the existence of the hot spot of the radius 20 in the direction R:A: = 148:4, Dec: = 44:5 (equatorial coordinates) in the high-energy subset with E

Ultra-High-Energy Cosmic-Ray Hotspot Observed with the Telescope Array Surface Detectors

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.