Observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with icecube
- Abbasi, R.
- Abdou, Y.
- Abu-Zayyad, T.
- Adams, J.
- Aguilar, J.
- Ahlers, M.
- Altmann, D.
- Andeen, K.
- Auffenberg, J.
- Bai, X.
- Baker, M.
- Barwick, S.
- Bay, R.
- Bazo Alba, J.
- Beattie, K.
- Beatty, J.
- Bechet, S.
- Becker, J.
- Becker, K.
- Benabderrahmane, M.
- BenZvi, S.
- Berdermann, J.
- Berghaus, P.
- Berley, D.
- Bernardini, E.
- Bertrand, D.
- Besson, D.
- Bindig, D.
- Bissok, M.
- Blaufuss, E.
- Blumenthal, J.
- Boersma, D.
- Bohm, C.
- Bose, D.
- Böser, S.
- Botner, O.
- Brown, A.
- Buitink, S.
- Caballero-Mora, K.
- Carson, Michael
- Chirkin, D.
- Christy, B.
- Clem, J.
- Clevermann, F.
- Cohen, S.
- Colnard, C.
- Cowen, D.
- D'Agostino, M.
- Danninger, M.
- Daughhetee, J.
- Davis, J.
- De Clercq, C.
- Demirörs, L.
- Denger, T.
- Depaepe, O.
- Descamps, F.
- Desiati, P.
- De Vries-Uiterweerd, G.
- DeYoung, T.
- Díaz-Vélez, J.
- Dierckxsens, M.
- Dreyer, J.
- Dumm, J.
- Ehrlich, R.
- Eisch, J.
- Ellsworth, R.
- Engdegård, O.
- Euler, S.
- Evenson, P.
- Fadiran, O.
- Fazely, A.
- Fedynitch, A.
- Feintzeig, J.
- Feusels, T.
- Filimonov, K.
- Finley, C.
- Fischer-Wasels, T.
- Foerster, M.
- Fox, B.
- Franckowiak, A.
- Franke, R.
- Gaisser, T.
- Gallagher, J.
- Gerhardt, L.
- Gladstone, L.
- Gl¨usenkamp, T.
- Goldschmidt, A.
- Goodman, J.
- Gora, D.
- Grant, D.
- Griesel, T.
- Groß, A.
- Grullon, S.
- Gurtner, M.
- Ha, C.
- Hajismail, A.
DOIAbstract
Between 2009 May and 2010 May, the IceCube neutrino detector at the South Pole recorded 32 billion muons generated in air showers produced by cosmic rays with a median energy of 20 TeV. With a data set of this size, it is possible to probe the southern sky for per-mil anisotropy on all angular scales in the arrival direction distribution of cosmic rays. Applying a power spectrum analysis to the relative intensity map of the cosmic ray flux in the southern hemisphere, we show that the arrival direction distribution is not isotropic, but shows significant structure on several angular scales. In addition to previously reported large-scale structure in the form of a strong dipole and quadrupole, the data show small-scale structure on scales bet...
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