arXiv:1304.5614·v2·High Energy Astrophysical Phenomena
Upper limit on the flux of photons with energies above 10^19 eV using the Telescope Array surface detector
T. Abu-Zayyad🇺🇸 · R. Aida🇯🇵 · M. Allen🇺🇸 · R. Anderson🇺🇸 · R. Azuma🇯🇵 · E. Barcikowski🇺🇸 · J.W. Belz🇺🇸 · D.R. Bergman🇺🇸 · S.A. Blake🇺🇸 · R. Cady🇺🇸 · B.G. Cheon🇰🇷 · J. Chiba🇯🇵
Abstract
We search for ultra-high energy photons by analyzing geometrical properties of shower fronts of events registered by the Telescope Array surface detector. By making use of an event-by-event statistical method, we derive upper limits on the absolute flux of primary photons with energies above 10^19, 10^19.5 and 10^20 eV based on the first three years of data taken.
Comments: 7 pages, 5 figures