Full-Sky Search for Ultra High Energy Cosmic Ray Anisotropies

Abstract

Using data from the SUGAR and the AGASA 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 > 10^{19.6} eV. We determine the angular power spectrum from an expansion in spherical harmonics for modes out to \ell=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.

v1. To appear in the Proceedings of the 28th International Cosmic Ray Conference, at http://www.icrr.u-tokyo.ac.jp/icrc2003/. v2. More detailed paper, submitted for publication. v3. Final version, to be published in Phys. Rev. D

References in corpus (12)

• Extension of the Cosmic-Ray Energy Spectrum Beyond the Predicted Greisen-Zatsepin-Kuz'min Cutoff
• Origin and Propagation of Extremely High Energy Cosmic Rays
• Small-scale anisotropy of cosmic rays above 10^19eV observed with the Akeno Giant Air Shower Array
• Cosmic Ray Anisotropy Analysis with a Full-Sky Observatory
• Cluster Analysis of Extremely High Energy Cosmic Rays in the Northern Sky
• Ultrahigh Energy Cosmic Rays: The state of the art before the Auger Observatory
• Correlation between Compact Radio Quasars and Ultra-High Energy Cosmic Rays
• The Angular Power Spectrum of BATSE 3B Gamma-Ray Burst
• Testing the Correlation of Ultra-High Energy Cosmic Rays with High Redshift Sources
• The Anisotropy of the Ultra-High Energy Cosmic Rays
• Large Scale Magnetic Fields and the Number of Cosmic Ray Sources above 10^(19) eV
• Correlation of Ultra High Energy Cosmic Rays with Compact Radio Loud Quasars

Cited by in corpus (15)

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• Ultra-High-Energy Cosmic Rays
• Astrophysical Origins of Ultrahigh Energy Cosmic Rays
• Ultrahigh-energy cosmic-ray bounds on nonbirefringent modified-Maxwell theory
• Searching for a Correlation Between Cosmic-Ray Sources Above 10^{19} eV and Large-Scale Structure
• High Energy Physics in the Atmosphere: Phenomenology of Cosmic Ray Air Showers
• Clustering of ultra-high energy cosmic ray arrival directions on medium scales
• Performance and science reach of POEMMA for ultrahigh-energy particles
• Decaying Superheavy Dark Matter and Subgalactic Structure of the Universe
• Gamma-Ray Bursts and Magnetars as Possible Sources of Ultra High Energy Cosmic Rays: Correlation of Cosmic Ray Event Positions with IRAS Galaxies
• Angular Power Spectrum Estimation of Cosmic Ray Anisotropies with Full or Partial Sky Coverage
• Sensitivity of full-sky experiments to large scale cosmic ray anisotropies
• Astrophysical interpretation of the medium scale clustering in the ultra-high energy sky
• Sensitivity of orbiting JEM-EUSO to large-scale cosmic-ray anisotropies
• Prospects for discovery of physics beyond the Standard Model at the Pierre Auger Observatory