The Telescope Array (TA) experiment, the largest observatory for ultra-high energy cosmic rays in the Northern Hemisphere, has identified two medium-scale anisotropies: the TA Hotspot near the constellation Ursa Major and an excess in the direction of the Perseus-Pisces supercluster. Studying these medium-scale anisotropies may provide insights into the origins of ultra-high energy cosmic rays. This presentation will explore an oversampling analysis of TA surface detector data to evaluate these medium-scale event excesses and will present the latest findings on the TA Hotspot and the Perseus-Pisces supercluster excess.
Cite
@article{arxiv.2510.02739,
title = {Medium-scale anisotropies measured by Telescope Array surface detectors},
author = {Jihyun Kim and Dmitri Ivanov and Kazumasa Kawata and Hiroyuki Sagawa and Gordon Thomson},
journal= {arXiv preprint arXiv:2510.02739},
year = {2025}
}