OBSERVATION OF ANISOTROPY IN THE GALACTIC COSMIC-RAY ARRIVAL DIRECTIONS AT 400 TeV WITH ICECUBE

Academic Article

Abstract

  • In this paper we report the first observation in the Southern hemisphere of an energy dependence in the Galactic cosmic ray anisotropy up to a few hundred TeV. This measurement was performed using cosmic ray induced muons recorded by the partially deployed IceCube observatory between May 2009 and May 2010. The data include a total of 33$\times 10^{9}$ muon events with a median angular resolution of $\sim3^{\circ}$ degrees. A sky map of the relative intensity in arrival direction over the Southern celestial sky is presented for cosmic ray median energies of 20 and 400 TeV. The same large-scale anisotropy observed at median energies around 20 TeV is not present at 400 TeV. Instead, the high energy skymap shows a different anisotropy structure including a deficit with a post-trial significance of -6.3$\sigma$. This anisotropy reveals a new feature of the Galactic cosmic ray distribution, which must be incorporated into theories of the origin and propagation of cosmic rays.
  • Authors

  • Abbasi, R
  • Abdou, Y
  • Abu-Zayyad, T
  • Ackermann, M
  • Adams, J
  • Aguilar, JA
  • Ahlers, M
  • Allen, MM
  • Altmann, D
  • Andeen, K
  • Auffenberg, J
  • Bai, X
  • Baker, M
  • Barwick, SW
  • Bay, R
  • Alba, JL Bazo
  • Beattie, K
  • Beatty, JJ
  • Bechet, S
  • Becker, JK
  • Becker, K-H
  • Benabderrahmane, ML
  • BenZvi, S
  • Berdermann, J
  • Berghaus, P
  • Berley, D
  • Bernardini, E
  • Bertrand, D
  • Besson, DZ
  • Bindig, D
  • Bissok, M
  • Blaufuss, E
  • Blumenthal, J
  • Boersma, DJ
  • Bohm, C
  • Bose, D
  • Boeser, S
  • Botner, O
  • Brown, AM
  • Buitink, S
  • Caballero-Mora, KS
  • Carson, M
  • Chirkin, D
  • Christy, B
  • Clevermann, F
  • Cohen, S
  • Colnard, C
  • Cowen, DF
  • Silva, AH Cruz
  • D'Agostino, MV
  • Danninger, M
  • Daughhetee, J
  • Davis, JC
  • De Clercq, C
  • Degner, T
  • Demiroers, L
  • Descamps, F
  • Desiati, P
  • de Vries-Uiterweerd, G
  • DeYoung, T
  • Diaz-Velez, JC
  • Dierckxsens, M
  • Dreyer, J
  • Dumm, JP
  • Dunkman, M
  • Eisch, J
  • Ellsworth, RW
  • Engdegard, O
  • Euler, S
  • Evenson, PA
  • Fadiran, O
  • Fazely, AR
  • Fedynitch, A
  • Feintzeig, J
  • Feusels, T
  • Filimonov, K
  • Finley, C
  • Fischer-Wasels, T
  • Fox, BD
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  • Franke, R
  • Gaisser, TK
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  • Goodman, JA
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  • Grant, D
  • Griesel, T
  • Gross, A
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  • Gurtner, M
  • Ha, C
  • Ismail, A Haj
  • Hallgren, A
  • Halzen, F
  • Han, K
  • Hanson, K
  • Heinen, D
  • Helbing, K
  • Hellauer, R
  • Hickford, S
  • Hill, GC
  • Hoffman, KD
  • Hoffmann, B
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  • Huelsnitz, W
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  • Hulth, PO
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  • Schukraft, A
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  • Schulz, O
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  • Semburg, B
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  • Silvestri, A
  • Spiczak, GM
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  • Stamatikos, M
  • Stanev, T
  • Stezelberger, T
  • Stokstad, RG
  • Stoessl, A
  • Strahler, EA
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  • Taboada, I
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  • Tepe, A
  • Ter-Antonyan, S
  • Tilav, S
  • Toale, PA
  • Toscano, S
  • Tosi, D
  • van Eijndhoven, N
  • Vandenbroucke, J
  • Van Overloop, A
  • van Santen, J
  • Vehring, M
  • Voge, M
  • Walck, C
  • Waldenmaier, T
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  • Walter, M
  • Weaver, Ch
  • Wendt, C
  • Westerhoff, S
  • Whitehorn, N
  • Wiebe, K
  • Wiebusch, CH
  • Williams, DR
  • Wischnewski, R
  • Wissing, H
  • Wolf, M
  • Wood, TR
  • Woschnagg, K
  • Xu, C
  • Xu, DL
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  • Yanez, JP
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  • Yoshida, S
  • Zarzhitsky, P
  • Zoll, M
  • Collaboration, IceCube
  • Status

    Publication Date

  • February 10, 2012
  • Has Subject Area

    Keywords

  • astroparticle physics
  • cosmic rays
  • neutrinos
  • Digital Object Identifier (doi)

    Start Page

  • 33
  • End Page

  • 33
  • Volume

  • 746
  • Issue

  • 1