A search for anisotropy in the arrival directions of ultra-high-energy cosmic rays observed by the High Resolution Fly's Eye detector

Details A search for anisotropy in the arrival directions of ultra-high-energy cosmic rays observed by the High Resolution Fly's Eye detector A search for anisotropy in the arrival directions of ultra-high-energy cosmic rays observed by the High Resolution Fly's Eye detector

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phdt........34s&link_type=abstract

PhD Thesis, Proquest Dissertations And Theses 2006. Section 0240, Part 0606 164 pages; [Ph.D. dissertation].United States -- Ut

Physics

1

Anisotropy, Arrival Directions, Cosmic Rays, High-Resolution, Fly'S Eye, Ultrahigh-Energy Cosmic Rays

Scientific paper

Although the existence of cosmic rays with energies extending well above 10^19 eV has been confirmed, their origin remains one of the most important questions in astro-particle physics today. The High Resolution Fly's Eye Detector (HiRes) detects Ultra High Energy Cosmic Rays (UHECRs) by employing the air- fluorescence technique to observe Extensive Air Showers (EAS) in the atmosphere over Dugway, Utah. It has been collecting data since May 1997 during which time over 1500 events with energies greater than 10 18.5 eV have been observed in monocular mode. These events are characterized by arrival directions with asymmetric uncertainties, which are explored in detail for this study. Multiple methods are developed and utilized to search for anisotropies in the arrival directions. A primary emphasis is placed upon previous reported observations that suggested small-scale clustering and global dipole biases. Additionally a new method for searching for anisotropies is explored. While all conclusions are statistically limited in their applicability, the sensitivities are shown to be compatible with prior experiments. However, all evidence to date on the arrival directions of the UHECRs observed by HiRes in monocular mode is consistent with an isotropic distribution.

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