Skip to main navigation Skip to search Skip to main content

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

  • R. Abbasi
  • , Y. Abdou
  • , T. Abu-Zayyad
  • , J. Adams
  • , J. A. Aguilar
  • , M. Ahlers
  • , D. Altmann
  • , K. Andeen
  • , J. Auffenberg
  • , 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, D. Bindig, M. Bissok, E. Blaufuss, J. Blumenthal, D. J. Boersma, C. Bohm, D. Bose, S. Böser, O. Botner, A. M. Brown, S. Buitink, K. S. Caballero-Mora, M. Carson, D. Chirkin, B. Christy, J. Clem, F. Clevermann, S. Cohen, C. Colnard, D. F. Cowen, M. V. D'Agostino, M. Danninger, J. Daughhetee, J. C. Davis, C. De Clercq, L. Demirörs, T. Denger, O. Depaepe, F. Descamps, P. Desiati, G. De Vries-Uiterweerd, T. DeYoung, J. C. Díaz-Vélez, M. Dierckxsens, J. Dreyer, J. P. Dumm, R. Ehrlich, J. Eisch, R. W. Ellsworth, O. Engdegård, S. Euler, P. A. Evenson, O. Fadiran, A. R. Fazely, A. Fedynitch, J. Feintzeig, T. Feusels, K. Filimonov, C. Finley, T. Fischer-Wasels, M. M. Foerster, B. D. Fox, A. Franckowiak, R. Franke, T. K. Gaisser, J. Gallagher, L. Gerhardt, L. Gladstone, T. Gl̈usenkamp, A. Goldschmidt, J. A. Goodman, D. Gora, D. Grant, T. Griesel, A. Groß, S. Grullon, M. Gurtner, C. Ha, A. Hajismail, A. Hallgren, F. Halzen, K. Han, K. Hanson, D. Heinen, 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, A. Kappes, T. Karg, A. Karle, P. Kenny, J. Kiryluk, F. Kislat, S. R. Klein, J. H. Köhne, G. Kohnen, H. Kolanoski, L. Köpke, S. Kopper, D. J. Koskinen, M. Kowalski, T. Kowarik, M. Krasberg, T. Krings, G. Kroll, N. Kurahashi, T. Kuwabara, M. Labare, S. Lafebre, K. Laihem, H. Landsman, M. J. Larson, R. Lauer, J. L̈unemann, B. Madajczyk, J. Madsen, P. Majumdar, A. Marotta, R. Maruyama, K. Mase, H. S. Matis, K. Meagher, M. Merck, P. Ḿesźaros, 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, C. C. Price, P. B. Price, G. T. Przybylski, K. Rawlins, P. Redl, E. Resconi, W. Rhode, M. Ribordy, A. Rizzo, J. P. Rodrigues, P. Roth, F. Rothmaier, C. Rott, T. Ruhe, D. Rutledge, B. Ruzybayev, D. Ryckbosch, H. G. Sander, M. Santander, S. Sarkar, K. Schatto, T. Schmidt, A. Schönwald, 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, A. Stössl, S. Stoyanov, E. A. Strahler, T. Straszheim, M. Stür, G. W. Sullivan, Q. Swillens, H. Taavola, I. Taboada, A. Tamburro, A. Tepe, S. Ter-Antonyan, S. Tilav, P. A. Toale, S. Toscano, D. Tosi, D. Tur.can, N. Van Eijndhoven, J. Vandenbroucke, A. Van Overloop, J. Van Santen, M. Vehring, M. Voge, C. Walck, T. Waldenmaier, M. Wallraff, M. Walter, Ch Weaver, C. Wendt, S. Westerhoff, N. Whitehorn, K. Wiebe, C. H. Wiebusch, D. R. Williams, R. Wischnewski, H. Wissing, M. Wolf, T. R. Wood, K. Woschnagg, C. Xu, X. W. Xu, G. Yodh, S. Yoshida, P. Zarzhitsky, M. Zoll
  • University of Wisconsin-Madison
  • Ghent University
  • University of Wisconsin-River Falls
  • University of Canterbury
  • University of Oxford
  • RWTH Aachen University
  • Bergische Universität Wuppertal
  • University of Delaware
  • University of California, Irvine
  • University of California at Berkeley
  • Deutsches Elektronen-Synchrotron (DESY)
  • Lawrence Berkeley National Laboratory
  • Ohio State University
  • Université Libre de Bruxelles
  • Max-Planck-lnstitut für Kohlenforschung
  • University of Maryland
  • University of Kansas
  • Oskar Klein Centre
  • VUB Neurology
  • University of Bonn
  • Uppsala University
  • Eberly College of Science
  • pro3dure medical GmbH
  • Cole Polytechnique Fédérale
  • Max-Planck-Institut für Kernphysik
  • The Pennsylvania State University
  • Georgia Institute of Technology
  • Clark-Atlanta University
  • Southern University and A&M College
  • University of Alberta
  • Johannes Gutenberg University
  • University of Mons
  • Chiba-U
  • Humboldt-Universität zu Berlin
  • University of Bari
  • University of Alaska Anchorage
  • University of the West Indies
  • NASA Goddard Space Flight Center
  • University of Alabama

Research output: Contribution to journalArticlepeer-review

125 Scopus citations

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 20TeV. 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 = 1224 and declination δ = -474), 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.

Original languageEnglish
Article number16
JournalAstrophysical Journal
Volume740
Issue number1
DOIs
StatePublished - 10 Oct 2011
Externally publishedYes

Keywords

  • astroparticle physics
  • cosmic rays

Fingerprint

Dive into the research topics of 'Observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with icecube'. Together they form a unique fingerprint.

Cite this