Observation of an Anisotropy in the Galactic Cosmic Ray arrival direction at 400 TeV with IceCube
Creators: name: IceCube Collaboration
name: Abbasi, R.
name: Abdou, Y.
name: Abu-Zayyad, T.
name: Ackermann, M.
name: Adams, J.
name: Aguilar, J. A.
name: Ahlers, M.
name: Allen, M. M.
name: Altmann, D.
name: Andeen, K.
name: Auffenberg, J.
name: Bai, X.
name: Baker, M.
name: Barwick, S. W.
name: Bay, R.
name: Alba, J. L. Bazo
name: Beattie, K.
name: Beatty, J. J.
name: Bechet, S.
name: Becker, J. K.
name: Becker, K. -H.
name: Benabderrahmane, M. L.
name: BenZvi, S.
name: Berdermann, J.
name: Berghaus, P.
name: Berley, D.
name: Bernardini, E.
name: Bertrand, D.
name: Besson, D. Z.
name: Bindig, D.
name: Bissok, M.
name: Blaufuss, E.
name: Blumenthal, J.
name: Boersma, D. J.
name: Bohm, C.
name: Bose, D.
name: Böser, S.
name: Botner, O.
name: Brown, A. M.
name: Buitink, S.
name: Caballero-Mora, K. S.
name: Carson, M.
name: Chirkin, D.
name: Christy, B.
name: Clevermann, F.
name: Cohen, S.
name: Colnard, C.
name: Cowen, D. F.
name: Silva, A. H. Cruz
name: D'Agostino, M. V.
name: Danninger, M.
name: Daughhetee, J.
name: Davis, J. C.
name: De Clercq, C.
name: Degner, T.
name: Demirörs, L.
name: Descamps, F.
name: Desiati, P.
name: de Vries-Uiterweerd, G.
name: DeYoung, T.
name: Díaz-Vélez, J. C.
name: Dierckxsens, M.
name: Dreyer, J.
name: Dumm, J. P.
name: Dunkman, M.
name: Eisch, J.
name: Ellsworth, R. W.
name: Engdegård, O.
name: Euler, S.
name: Evenson, P. A.
name: Fadiran, O.
name: Fazely, A. R.
name: Fedynitch, A.
name: Feintzeig, J.
name: Feusels, T.
name: Filimonov, K.
name: Finley, C.
name: Fischer-Wasels, T.
name: Fox, B. D.
name: Franckowiak, A.
name: Franke, R.
name: Gaisser, T. K.
name: Gallagher, J.
name: Gerhardt, L.
name: Gladstone, L.
name: Glüsenkamp, T.
name: Goldschmidt, A.
name: Goodman, J. A.
name: Góra, D.
name: Grant, D.
name: Griesel, T.
name: Groß, A.
name: Grullon, S.
name: Gurtner, M.
name: Ha, C.
name: Ismail, A. Haj
name: Hallgren, A.
name: Halzen, F.
name: Han, K.
name: Hanson, K.
name: Heinen, D.
name: Helbing, K.
name: Hellauer, R.
name: Hickford, S.
name: Hill, G. C.
name: Hoffman, K. D.
name: Hoffmann, B.
name: Homeier, A.
name: Hoshina, K.
name: Huelsnitz, W.
name: Hülß, J. -P.
name: Hulth, P. O.
name: Hultqvist, K.
name: Hussain, S.
name: Ishihara, A.
name: Jacobi, E.
name: Jacobsen, J.
name: Japaridze, G. S.
name: Johansson, H.
name: Kampert, K. -H.
name: Kappes, A.
name: Karg, T.
name: Karle, A.
name: Kenny, P.
name: Kiryluk, J.
name: Kislat, F.
name: Klein, S. R.
name: Köhne, J. -H.
name: Kohnen, G.
name: Kolanoski, H.
name: Köpke, L.
name: Kopper, S.
name: Koskinen, D. J.
name: Kowalski, M.
name: Kowarik, T.
name: Krasberg, M.
name: Kroll, G.
name: Kurahashi, N.
name: Kuwabara, T.
name: Labare, M.
name: Laihem, K.
name: Landsman, H.
name: Larson, M. J.
name: Lauer, R.
name: Lünemann, J.
name: Madsen, J.
name: Marotta, A.
name: Maruyama, R.
name: Mase, K.
name: Matis, H. S.
name: Meagher, K.
name: Merck, M.
name: Mészáros, P.
name: Meures, T.
name: Miarecki, S.
name: Middell, E.
name: Milke, N.
name: Miller, J.
name: Montaruli, T.
name: Morse, R.
name: Movit, S. M.
name: Nahnhauer, R.
name: Nam, J. W.
name: Naumann, U.
name: Nygren, D. R.
name: Odrowski, S.
name: Olivas, A.
name: Olivo, M.
name: O'Murchadha, A.
name: Panknin, S.
name: Paul, L.
name: Heros, C. Pérez de los
name: Petrovic, J.
name: Piegsa, A.
name: Pieloth, D.
name: Porrata, R.
name: Posselt, J.
name: Price, C. C.
name: Price, P. B.
name: Przybylski, G. T.
name: Rawlins, K.
name: Redl, P.
name: Resconi, E.
name: Rhode, W.
name: Ribordy, M.
name: Richman, M.
name: Rodrigues, J. P.
name: Rothmaier, F.
name: Rott, C.
name: Ruhe, T.
name: Rutledge, D.
name: Ruzybayev, B.
name: Ryckbosch, D.
name: Sander, H. -G.
name: Santander, M.
name: Sarkar, S.
name: Schatto, K.
name: Schmidt, T.
name: Schönwald, A.
name: Schukraft, A.
name: Schultes, A.
name: Schulz, O.
name: Schunck, M.
name: Seckel, D.
name: Semburg, B.
name: Seo, S. H.
name: Sestayo, Y.
name: Seunarine, S.
name: Silvestri, A.
name: Spiczak, G. M.
name: Spiering, C.
name: Stamatikos, M.
name: Stanev, T.
name: Stezelberger, T.
name: Stokstad, R. G.
name: Stößl, A.
name: Strahler, E. A.
name: Ström, R.
name: Stüer, M.
name: Sullivan, G. W.
name: Swillens, Q.
name: Taavola, H.
name: Taboada, I.
name: Tamburro, A.
name: Tepe, A.
name: Ter-Antonyan, S.
name: Tilav, S.
name: Toale, P. A.
name: Toscano, S.
name: Tosi, D.
name: van Eijndhoven, N.
name: Vandenbroucke, J.
name: Van Overloop, A.
name: van Santen, J.
name: Vehring, M.
name: Voge, M.
name: Walck, C.
name: Waldenmaier, T.
name: Wallraff, M.
name: Walter, M.
name: Weaver, Ch.
name: Wendt, C.
name: Westerhoff, S.
name: Whitehorn, N.
name: Wiebe, K.
name: Wiebusch, C. H.
name: Williams, D. R.
name: Wischnewski, R.
name: Wissing, H.
name: Wolf, M.
name: Wood, T. R.
name: Woschnagg, K.
name: Xu, C.
name: Xu, D. L.
name: Xu, X. W.
name: Yanez, J. P.
name: Yodh, G.
name: Yoshida, S.
name: Zarzhitsky, P.
name: Zoll, M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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$σ$. 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.