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Measurement of the anisotropy of cosmic-ray arrival directions with icecube

  • R. Abbasi
  • , Y. Abdou
  • , T. Abu-Zayyad
  • , J. Adams
  • , J. A. Aguilar
  • , M. Ahlers
  • , K. Andeen
  • , Auffenberg.J.
  • , X. Bai
  • , M. Baker
  • , S. W. Barwick
  • , R. Bay
  • , J. L. Bazo Alba
  • , K. Beattie
  • , J. J. Beatty
  • , S. Bechet
  • , J. K. Becker
  • , K. H. Becker
  • , M. L. Benabderrahmane
  • , S. BenZvi
  • J. Berdermann, P. Berghaus, D. Berley, E. Bernardini, D. Bertrand, D. Z. Besson, M. Bissok, E. Blaufuss, D. J. Boersma, C. Bohm, S. Böser, O. Botner, L. Bradley, J. Braun, S. Buitink, M. Carson, D. Chirkin, B. Christy, J. Clem, F. Clevermann, S. Cohen, C. Colnard, D. F. Cowen, M. V. D'Agostino, M. Danninger, J. C. Davis, C. De Clercq, L. Demirörs, O. Depaepe, F. Descamps, P. Desiati, G. De Vries-Uiterweerd, T. DeYoung, J. C. Díaz-Vélez, M. Dierckxsens, J. Dreyer, J. P. Dumm, M. R. Duvoort, R. Ehrlich, J. Eisch, R. W. Ellsworth, O. Engdegård, S. Euler, P. A. Evenson, O. Fadiran, A. R. Fazely, T. Feusels, K. Filimonov, C. Finley, M. M. Foerster, B. D. Fox, A. Franckowiak, R. Franke, T. K. Gaisser, J. Gallagher, M. Geisler, L. Gerhardt, L. Gladstone, T. Glüsenkamp, A. Goldschmidt, J. A. Goodman, D. Grant, T. Griesel, A. Groß, S. Grullon, M. Gurtner, C. Ha, A. Hallgren, F. Halzen, K. Han, K. Hanson, K. Helbing, P. Herquet, S. Hickford, G. C. Hill, K. D. Hoffman, A. Homeier, K. Hoshina, D. Hubert, W. Huelsnitz, J. P. Hülß, P. O. Hulth, K. Hultqvist, S. Hussain, A. Ishihara, J. Jacobsen, G. S. Japaridze, H. Johansson, J. M. Joseph, K. H. Kampert, T. Karg, A. Karle, J. L. Kelley, N. Kemming, P. Kenny, J. Kiryluk, F. Kislat, S. R. Klein, S. Knops, J. H. Köhne, G. Kohnen, H. Kolanoski, L. Köpke, D. J. Koskinen, M. Kowalski, T. Kowarik, M. Krasberg, T. Krings, G. Kroll, K. Kuehn, T. Kuwabara, M. Labare, S. Lafebre, K. Laihem, H. Landsman, R. Lauer, R. Lehmann, D. Lennarz, J. Lünemann, J. Madsen, P. Majumdar, A. Marotta, R. Maruyama, K. Mase, H. S. Matis, M. Matusik, K. Meagher, M. Merck, P. Mészáros, T. Meures, E. Middell, N. Milke, J. Miller, T. Montaruli, R. Morse, S. M. Movit, R. Nahnhauer, J. W. Nam, U. Naumann, P. Nießen, D. R. Nygren, S. Odrowski, A. Olivas, M. Olivo, A. O'Murchadha, M. Ono, S. Panknin, L. Paul, C. Pérez de los Heros, J. Petrovic, A. Piegsa, D. Pieloth, R. Porrata, J. Posselt, P. B. Price, M. Prikockis, G. T. Przybylski, K. Rawlins, P. Redl, E. Resconi, W. Rhode, M. Ribordy, A. Rizzo, J. P. Rodrigues, P. Roth, F. Rothmaier, C. Rott, C. Roucelle, T. Ruhe, D. Rutledge, B. Ruzybayev, D. Ryckbosch, H. G. Sander, M. Santander, S. Sarkar, K. Schatto, S. Schlenstedt, T. Schmidt, A. Schukraft, A. Schultes, O. Schulz, M. Schunck, D. Seckel, B. Semburg, S. H. Seo, Y. Sestayo, S. Seunarine, A. Silvestri, A. Slipak, G. M. Spiczak, C. Spiering, M. Stamatikos, T. Stanev, G. Stephens, T. Stezelberger, R. G. Stokstad, S. Stoyanov, E. A. Strahler, T. Straszheim, G. W. Sullivan, Q. Swillens, H. Taavola, I. Taboada, A. Tamburro, O. Tarasova, A. Tepe, S. Ter-Antonyan, S. Tilav, P. A. Toale, S. Toscano, D. Tosi, D. Turčan, N. Van Eijndhoven, J. Vandenbroucke, A. Van Overloop, J. Van Santen, M. Voge, B. Voigt, C. Walck, T. Waldenmaier, M. Wallraff, M. Walter, Ch Weaver, C. Wendt, S. Westerhoff, N. Whitehorn, K. Wiebe, C. H. Wiebusch, G. Wikström, D. R. Williams, R. Wischnewski, H. Wissing, M. Wolf, K. Woschnagg, C. Xu, X. W. Xu, G. Yodh, S. Yoshida, P. Zarzhitsky
  • University of Wisconsin-Madison
  • Ghent University
  • University of Wisconsin-River Falls
  • University of Canterbury
  • University of Oxford
  • University of Wuppertal
  • University of Delaware
  • University of California at Irvine
  • University of California at Berkeley
  • German Electron Synchrotron
  • Lawrence Berkeley National Laboratory
  • Ohio State University
  • Université libre de Bruxelles
  • Ruhr University Bochum
  • University of Maryland, College Park
  • University of Kansas
  • RWTH Aachen University
  • Oskar Klein Centre
  • University of Bonn
  • Uppsala University
  • Pennsylvania State University
  • TU Dortmund University
  • Swiss Federal Institute of Technology Lausanne
  • Max Planck Institute for Nuclear Physics
  • Vrije Universiteit Brussel
  • Utrecht University
  • Clark Atlanta University
  • Southern University and A&M College
  • University of Alberta
  • Johannes Gutenberg University Mainz
  • Universite de Mons
  • Chiba University
  • Humboldt University of Berlin
  • University of Bari
  • University of Alaska Anchorage
  • The University of the West Indies
  • NASA Goddard Space Flight Center
  • Georgia Institute of Technology
  • University of Alabama

Research output: Contribution to journalArticlepeer-review

152 Scopus citations

Abstract

We report the first observation of an anisotropy in the arrival direction of cosmic rays with energies in the multi-TeV region in theSouthern sky using data from the IceCube detector. Between 2007 June and 2008 March, the partially deployed IceCube detector was operated in a configuration with 1320 digital optical sensors distributed over22 strings at depths between 1450 and 2450 m inside the Antarctic ice. IceCube is a neutrino detector, but the data are dominated by a large background of cosmic-ray muons. Therefore, the background data aresuitable for high-statistics studies of cosmic rays in the southern sky. The data include 4.3 billion muons produced by downward-going cosmic-ray interactions in the atmosphere; these events were reconstructed with a median angular resolution of 3° and a median energy of ∼20 TeV. Their arrival direction distribution exhibits an anisotropy in right ascension with a first-harmonic amplitude of (6.4±0.2 stat.±0.8 syst.) × 10-4.

Original languageEnglish
Pages (from-to)L194-L198
JournalAstrophysical Journal Letters
Volume718
Issue number2 PART 2
DOIs
StatePublished - Aug 1 2010

Keywords

  • Cosmic rays-neutrinos

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