Search for Point Sources of Ultra-High Energy Cosmic Rays Above 40 EeV Using a Maximum Likelihood Ratio Test

Abstract

We present the results of a search for cosmic ray point sources at energies above 40 EeV in the combined data sets recorded by the AGASA and HiRes stereo experiments. The analysis is based on a maximum likelihood ratio test using the probability density function for each event rather than requiring an a priori choice of a fixed angular bin size. No statistically significant clustering of events consistent with a point source is found.

arXiv comment7 pages, 7 figures. Accepted for publication in The Astrophysical Journal

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• The optical depth of the Universe to ultrahigh energy cosmic ray scattering in the magnetized large scale structure
• Cosmic Rays: The Second Knee and Beyond
• TeV gamma-rays and neutrinos from photo-disintegration of nuclei in Cygnus OB2
• Observations of Microwave Continuum Emission from Air Shower Plasmas
• Cosmic Ray Astronomy
• Cosmic Rays and the Search for a Lorentz Invariance Violation
• Propagation of Ultra-High Energy Cosmic Rays above $10^{19}$ eV in a Structured Extragalactic Magnetic Field and Galactic Magnetic Field
• The footprint of large scale cosmic structure on the ultra-high energy cosmic ray distribution
• Cross-Correlation between UHECR Arrival Distribution and Large-Scale Structure
• Highest Energy Cosmic Rays and results from the HiRes Experiment
• Tidal Disruption Flares as the Source of Ultra-high Energy Cosmic Rays
• Foreground and Source of a Cluster of Ultra-high Energy Cosmic Rays
• Towards unravelling the structural distribution of ultra-high-energy cosmic ray sources
• Search for Point-Like Sources of Cosmic Rays with Energies above 10^18.5 eV in the HiRes-I Monocular Data-Set
• Observations of Ultra-High Energy Cosmic Rays
• Astrophysics in 2005
• Experimental Ultra--High-Energy Cosmic Ray Physics
• Ultra High Energy Cosmic Rays: Anisotropies and Spectrum
• A search for outstanding sources of PeV cosmic rays: Cassiopeia A, the Crab Nebula, the Monogem Ring--But how about M33 and the Virgo cluster?
• Ultra-high energy cosmic rays: from GeV to ZeV
• Search for Correlations between Nearby AGNs and Ultra-high Energy Cosmic Rays
• Evidence that a cluster of UHECRs was produced by a burst or flare
• The signature of local cosmic structures on the ultra-high energy cosmic ray anisotropies
• Magnetic deflections and possible sources of the ultra-high-energy cosmic rays in the AGASA-HiRes-Yakutsk cluster
• Search for Cross-Correlations of Ultra--High-Energy Cosmic Rays with BL Lacertae Objects