Power Laws and the Cosmic Ray Energy Spectrum

Details Power Laws and the Cosmic Ray Energy Spectrum Power Laws and the Cosmic Ray Energy Spectrum

2006-10-30

arxiv.org/abs/astro-ph/0610865v1

Astropart.Phys.27:455-464,2007

Astronomy and Astrophysics

Astrophysics

21 pages, 18 figures, submitted to Astro. Part. Phys

Scientific paper

10.1016/j.astropartphys.2007.02.

Two separate statistical tests are applied to the AGASA and preliminary Auger Cosmic Ray Energy spectra in an attempt to find deviation from a pure power-law. The first test is constructed from the probability distribution for the maximum event of a sample drawn from a power-law. The second employs the TP-statistic, a function defined to deviate from zero when the sample deviates from the power-law form, regardless of the value of the power index. The AGASA data show no significant deviation from a power-law when subjected to both tests. Applying these tests to the Auger spectrum suggests deviation from a power-law. However, potentially large systematics on the relative energy scale prevent us from drawing definite conclusions at this time.

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