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    Observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with icecube

    Access Status
    Open access via publisher
    Authors
    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.
    Date
    2011
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Abbasi, R. and Abdou, Y. and Abu-Zayyad, T. and Adams, J. and Aguilar, J. and Ahlers, M. and Altmann, D. et al. 2011. Observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with icecube. Astrophysical Journal. 740 (1).
    Source Title
    Astrophysical Journal
    DOI
    10.1088/0004-637X/740/1/16
    ISSN
    0004-637X
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/29425
    Collection
    • Curtin Research Publications
    Abstract

    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 between 15° and 30°. The skymap exhibits several localized regions of significant excess and deficit in cosmic ray intensity. The relative intensity of the smaller-scale structures is about a factor of five weaker than that of the dipole and quadrupole structure. The most significant structure, an excess localized at (right ascension α = 122fdg4 and declination δ = –47fdg4), extends over at least 20° in right ascension and has a post-trials significance of 5.3σ. The origin of this anisotropy is still unknown.

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