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

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arxiv 0711.2002 v1 pith:UJLC652U submitted 2007-11-13 astro-ph

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

M.Amenomori , X.J.Bi , D.Chen , S.W.Cui , Danzengluobu , L.K.Ding , X.H.Ding , C.Fan
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C.F.Feng Zhaoyang Feng Z.Y.Feng X.Y.Gao Q.X.Geng H.W.Guo H.H.He M.He K.Hibino N.Hotta Haibing Hu H.B.Hu J.Huang Q.Huang H.Y.Jia F.Kajino K.Kasahara Y.Katayose C.Kato K.Kawata Labaciren G.M.Le A.F.Li J.Y.Li Y.-Q.Lou H.Lu S.L.Lu X.R.Meng K.Mizutani J.Mu K.Munakata A.Nagai H.Nanjo M.Nishizawa M.Ohnishi I.Ohta H.Onuma T.Ouchi S.Ozawa J.R.Ren T.Saito T.Y.Saito M.Sakata T.K.Sako M.Shibata A.Shiomi T.Shirai H.Sugimoto M.Takita Y.H.Tan N.Tateyama S.Torii H.Tsuchiya S.Udo B.Wang H.Wang X.Wang Y.Wang Y.G.Wang H.R.Wu L.Xue Y.Yamamoto C.T.Yan X.C.Yang S.Yasue Z.H.Ye G.C.Yu A.F.Yuan T.Yuda H.M.Zhang J.L.Zhang N.J.Zhang X.Y.Zhang Y.Zhang Yi Zhang Zhaxisangzhu X.X.Zhou (for the Tibet ASgamma Collaboration)
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keywords anisotropyindexcompton-gettingcosmic-rayenergyspectralspectrumair-shower
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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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