Full-sky search for ultrahigh energy cosmic ray anisotropies

Luis Anchordoqui, Carlos Hojvat, Thomas McCauley, Thomas Paul, Stephen Reucroft, John Swain, and Allan Widom
Phys. Rev. D 68, 083004 – Published 31 October 2003
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Abstract

Using data from the Sydney University Giant Air-Shower Recorder and the Akeno Giant Air-Shower Array experiments taken during a 10 yr period with nearly uniform exposure to the entire sky, we search for large-scale anisotropy patterns in the arrival directions of cosmic rays with energies >1019.6eV. We determine the angular power spectrum from an expansion in spherical harmonics for modes out to l=5. Based on available statistics, we find no significant deviation from isotropy. We compare the rather modest results which can be extracted from existing data samples with the results that should be forthcoming as new full-sky observatories begin operation.

  • Received 27 June 2003

DOI:https://doi.org/10.1103/PhysRevD.68.083004

©2003 American Physical Society

Authors & Affiliations

Luis Anchordoqui

  • Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA

Carlos Hojvat

  • Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510, USA

Thomas McCauley, Thomas Paul, Stephen Reucroft, John Swain, and Allan Widom

  • Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA

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Vol. 68, Iss. 8 — 15 October 2003

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