Study of Small-Scale Anisotropy of Ultrahigh Energy Cosmic Rays Observed in Stereo by HiRes
arXiv:astro-ph/0404137 · doi:10.1086/423303
Abstract
The High Resolution Fly's Eye (HiRes) experiment is an air fluorescence detector which, operating in stereo mode, has a typical angular resolution of 0.6 degrees and is sensitive to cosmic rays with energies above 10^18 eV. HiRes is thus an excellent instrument for the study of the arrival directions of ultrahigh energy cosmic rays. We present the results of a search for anisotropies in the distribution of arrival directions on small scales (<5 degrees) and at the highest energies (>10^19 eV). The search is based on data recorded between 1999 December and 2004 January, with a total of 271 events above 10^19 eV. No small-scale anisotropy is found, and the strongest clustering found in the HiRes stereo data is consistent at the 52% level with the null hypothesis of isotropically distributed arrival directions.
4 pages, 3 figures. Matches accepted ApJL version
References in corpus (2)
Cited by in corpus (55)
- Correlation of the highest energy cosmic rays with nearby extragalactic objects
- On astrophysical solution to ultra high energy cosmic rays
- Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei
- Cosmic Rays from the Knee to the Highest Energies
- Anisotropy vs chemical composition at ultra-high energies
- GZK Photons as Ultra High Energy Cosmic Rays
- Neutrinos as a diagnostic of cosmic ray Galactic/extra-galactic transition
- Search for Cross-Correlations of Ultra--High-Energy Cosmic Rays with BL Lacertae Objects
- Cosmic Rays: The Second Knee and Beyond
- Observations of Microwave Continuum Emission from Air Shower Plasmas
- Cosmic Ray Astronomy
- Ultra-high energy cosmic rays from a finite number of point sources
- Propagation of Ultra-High Energy Cosmic Rays above eV in a Structured Extragalactic Magnetic Field and Galactic Magnetic Field
- Search for Point Sources of Ultra-High Energy Cosmic Rays Above 40 EeV Using a Maximum Likelihood Ratio Test
- Intergalactic Magnetic Field and Arrival Direction of Ultra-High-Energy Protons
- Clustering of ultra-high energy cosmic ray arrival directions on medium scales
- Highest Energy Cosmic Rays and results from the HiRes Experiment
- Anisotropy expectations for ultra-high-energy cosmic rays with future high statistics experiments
- Implications to Sources of Ultra-high-energy Cosmic Rays from their Arrival Distribution
- GZK Photons Above 10 EeV
- Do Ultrahigh Energy Cosmic Rays Come from Active Galactic Nuclei and Fermi -ray Sources?
- Constraints on the Local Sources of Ultra High-Energy Cosmic Rays
- A comparative study of correlations between arrival directions of ultra-high-energy cosmic rays and positions of their potential astrophysical sources
- A Search for Arrival Direction Clustering in the HiRes-I Monocular Data above 10^(19.5) eV
- Statistical Analysis of the Correlation between Active Galactic Nuclei and Ultra-High Energy Cosmic Rays
- Clustering properties of ultrahigh energy cosmic rays and the search for their astrophysical sources
- Observing Ultra High Energy Cosmic Particles from Space: SEUSO, the Super Extreme Universe Space Observatory Mission
- Composition of UHECR and the Pierre Auger Observatory Spectrum
- On The Origin of Very High Energy Cosmic Rays
- Statistical Significance of Small Scale Anisotropy in Arrival Directions of Ultra-High Energy Cosmic Rays
- Estimate of the correlation signal between cosmic rays and BL Lacs in future data
- The Origin of Primordial Magnetic Fields
- First hints of large scale structures in the ultra-high energy sky?
- Particle Diffusion and Acceleration by Shock Wave in Magnetized Filamentary Turbulence
- Foreground and Source of a Cluster of Ultra-high Energy Cosmic Rays
- Search for Point-Like Sources of Cosmic Rays with Energies above 10^18.5 eV in the HiRes-I Monocular Data-Set
- Estimation Prospects of the Source Number Density of Ultra-high-energy Cosmic Rays
- Statistics of cluster multiplicity and the nature of UHE cosmic ray sources
- Detecting filaments in the ultra-high energy cosmic ray distribution
- Observations of Ultra-High Energy Cosmic Rays
- Search for clustering of ultra high energy cosmic rays from the Pierre Auger Observatory
- Anisotropies and clustering of extragalactic cosmic rays
- Experimental Ultra--High-Energy Cosmic Ray Physics
- Astrophysical interpretation of the medium scale clustering in the ultra-high energy sky
- Search for Small-Scale Anisotropy of Cosmic Rays above 10^19 eV with HiRes Stereo
- A Likelihood Method for Measuring the Ultrahigh Energy Cosmic Ray Composition
- Astronomy with ultra high-energy particles
- On the origin of the diffuse gamma-ray background radiation
- The Pierre Auger Observatory -Status and Prospects -
- The origin of ultra high energy cosmic rays
- Magnetic deflections and possible sources of the ultra-high-energy cosmic rays in the AGASA-HiRes-Yakutsk cluster
- Open questions with ultra-high energy cosmic rays
- Search for Cross-Correlations of Ultra--High-Energy Cosmic Rays with BL Lacertae Objects
- Sequential Analysis Techniques for Correlation Studies in Particle Astronomy
- The Search for Anisotropy in the Arrival Directions of Ultra-High Energy Cosmic Rays Observed by the High Resolution Fly's Eye Detector in Monocular Mode