Search for anisotropy in arrival directions of ultrahigh-energy cosmic rays by using the Marr wavelet on the equatorial sphere
2003
5 pages
Published in:
- JETP Lett. 78 (2003) 695-699,
- Pisma Zh.Eksp.Teor.Fiz. 78 (2003) 1207-1211
DOI:
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Abstract: (Springer)
The arrival direction distribution of cosmic rays for energies E>1018 eV detected at the Yakutsk EAS array is analyzed using the Marr wavelet. Deviation from the isotropic distribution of 361 showers above 1019 eV is found at a significance level of 0.007, which corroborates previous evidence of the cosmic ray anisotropy in this energy range. In contrast to the previous methods, the wavelet analysis makes it possible to localize both a celestial-sphere domain containing a supposed source of excess cosmic ray flux and the scale parameter of the two-dimensional wavelet.- cosmic radiation: anisotropy
- showers: air
- cosmic radiation: flux
- data analysis method: wavelet
- cosmic radiation: primary
- cosmic radiation: angular distribution
- numerical calculations: interpretation of experiments
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