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Search for point-like sources of cosmic rays with energies above 10 eV in the HiRes-I monocular data set |
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| Institution: | aUniversity of Utah, Department of Physics and High Energy Astrophysics Institute, Salt Lake City, UT, USA bLos Alamos National Laboratory, Los Alamos, NM, USA cColumbia University, Department of Physics and Nevis Laboratory, New York, NY, USA dRutgers – The State University of New Jersey, Department of Physics and Astronomy, Piscataway, NJ, USA eMontana State University, Department of Physics, Bozeman, MT, USA fUniversity of Tokyo, Institute for Cosmic Ray Research, Kashiwa, Japan gUniversity of New Mexico, Department of Physics and Astronomy, Albuquerque, NM, USA |
| Abstract: | We report the results of a search for point-like deviations from isotropy in the arrival directions of ultra-high energy cosmic rays in the northern hemisphere. In the monocular data set collected by the High-Resolution Fly’s Eye, consisting of 1525 events with energy exceeding 1018.5 eV, we find no evidence for point-like excesses. We place a 90% c.l. upper limit of 0.8 hadronic cosmic rays/km2 yr on the flux from such sources for the northern hemisphere and place tighter limits as a function of position in the sky. |
| Keywords: | Cosmic rays Anisotropy Point source HiRes |
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