In the present-day cosmic ray data, the strongest indication of anisotropy of the ultrahigh energy cosmic rays is the 20-degree hotspot observed by the Telescope Array with the statistical significance of 3.4\sigma. In this work, we study the possibility of detecting such a spot by space-based all-sky observatories. We show that if the detected luminosity of the hotspot is attributed to a physical effect and not a statistical fluctuation, the KLYPVE and JEM-EUSO experiments would need to collect ~300 events with E>57 EeV in order to detect the hotspot at the 5\sigma\ confidence level with the 68% probability. We also study the dependence of the detection prospects on the hotspot luminosity.
@article{arxiv.1601.06363,
title = {Detection prospects of the Telescope Array hotspot by space observatories},
author = {D. Semikoz and P. Tinyakov and M. Zotov},
journal= {arXiv preprint arXiv:1601.06363},
year = {2016}
}
Comments
4 pages; v2: minor style changes to match the published version