New estimation of the spectral index of high-energy cosmic rays as determined by the Compton-Getting anisotropy

Details New estimation of the spectral index of high-energy cosmic rays as determined by the Compton-Getting anisotropy New estimation of the spectral index of high-energy cosmic rays as determined by the Compton-Getting anisotropy

2007-11-13

arxiv.org/abs/0711.2002v1

Astronomy and Astrophysics

Astrophysics

accepted to ApJL

Scientific paper

10.1086/525526

The amplitude of the Compton-Getting (CG) anisotropy contains the power-law index of the cosmic-ray energy spectrum. Based on this relation and using the Tibet air-shower array data, we measure the cosmic-ray spectral index to be $-3.03 \pm 0.55_{stat} \pm < 0.62_{syst}$ between 6 TeV and 40 TeV, consistent with $-$2.7 from direct energy spectrum measurements. Potentially, this CG anisotropy analysis can be utilized to confirm the astrophysical origin of the ``knee'' against models for non-standard hadronic interactions in the atmosphere.

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