Analysis of Large-Scale Anisotropy of Ultra-High Energy Cosmic Rays in HiRes Stereo Data - INSPIRE

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Analysis of Large-Scale Anisotropy of Ultra-High Energy Cosmic Rays in HiRes Stereo Data

Feb, 2010

9 pages

Published in:

Astrophys.J.Lett. 713 (2010) 1, L64-L68

e-Print:

1002.1444 [astro-ph.HE]

DOI:

10.1088/2041-8205/713/1/L64

Experiments:

HIRES

View in:

ADS Abstract Service

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Abstract:

Stereo data collected by the HiRes experiment over a six-year period are examined for large-scale anisotropy related to the inhomogeneous distribution of matter in the nearby universe. We consider the generic case of small cosmic-ray deflections and a large number of sources tracing the matter distribution. In this matter tracer model the expected cosmic-ray flux depends essentially on a single free parameter, the typical deflection angle θ s . We find that the HiRes data with threshold energies of 40 EeV and 57 EeV are incompatible with the matter tracer model at a 95% confidence level unless θ s > 10° and are compatible with an isotropic flux. The data set above 10 EeV is compatible with both the matter tracer model and an isotropic flux.

Note:

9 pages, 5 Postscript figures

cosmic radiation: flux
cosmic radiation: deflection
cosmic radiation: UHE
energy: threshold
cosmic radiation: anisotropy
confidence limit
matter
data analysis method
statistics
numerical calculations: interpretation of experiments

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