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OBSERVATION OF COSMIC-RAY ANISOTROPY WITH THE ICETOP AIR SHOWER ARRAY
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2013 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 765, 55Article in journal (Refereed) Published
Abstract [en]

We report on the observation of anisotropy in the arrival direction distribution of cosmic rays at PeV energies. The analysis is based on data taken between 2009 and 2012 with the IceTop air shower array at the south pole. IceTop, an integral part of the IceCube detector, is sensitive to cosmic rays between 100 TeV and 1 EeV. With the current size of the IceTop data set, searches for anisotropy at the 10(-3) level can, for the first time, be extended to PeV energies. We divide the data set into two parts with median energies of 400 TeV and 2 PeV, respectively. In the low energy band, we observe a strong deficit with an angular size of about 30 degrees and an amplitude of (-1.58 +/- 0.46(stat) +/- 0.52(sys)) x 10(-3) at a location consistent with previous observations of cosmic rays with the IceCube neutrino detector. The study of the high energy band shows that the anisotropy persists to PeV energies and increases in amplitude to (-3.11 +/- 0.38(stat) +/- 0.96(sys)) x 10(-3).

Place, publisher, year, edition, pages
2013. Vol. 765, 55
Keyword [en]
astroparticle physics cosmic rays arrival directions icecube astronomy spectrum Astronomy & Astrophysics
Research subject
SWEDARP, IceCube; SWEDARP, IceCube
Identifiers
URN: urn:nbn:se:polar:diva-1946DOI: 10.1088/0004-637x/765/1/55OAI: oai:DiVA.org:polar-1946DiVA: diva2:820721
Note

ISI Document Delivery No.: 090CZ Times Cited: 15 Cited Reference Count: 26 Aartsen, M. G. Abbasi, R. Abdou, Y. Ackermann, M. Adams, J. Aguilar, J. A. Ahlers, M. Altmann, D. Andeen, K. Auffenberg, J. Bai, X. Baker, M. Barwick, S. W. Baum, V. Bay, R. Beattie, K. Beatty, J. J. Bechet, S. Tjus, J. Becker Becker, K. -H. Bell, M. Benabderrahmane, M. L. BenZvi, S. Berdermann, J. Berghaus, P. Berley, D. Bernardini, E. Bertrand, D. Besson, D. Z. Bindig, D. Bissok, M. Blaufuss, E. Blumenthal, J. Boersma, D. J. Bohaichuk, S. Bohm, C. Bose, D. Boeser, S. Botner, O. Brayeur, L. Brown, A. M. Bruijn, R. Brunner, J. Carson, M. Casey, J. Casier, M. Chirkin, D. Christy, B. Clark, K. Clevermann, F. Cohen, S. Cowen, D. F. Silva, A. H. Cruz Danninger, M. Daughhetee, J. Davis, J. C. De Clercq, C. De Ridder, S. Descamps, F. Desiati, P. de Vries-Uiterweerd, G. DeYoung, T. Diaz-Velez, J. C. Dreyer, J. Dumm, J. P. Dunkman, M. Eagan, R. Eisch, J. Ellsworth, R. W. Engdegard, O. Euler, S. Evenson, P. A. Fadiran, O. Fazely, A. R. Fedynitch, A. Feintzeig, J. Feusels, T. Filimonov, K. Finley, C. Fischer-Wasels, T. Flis, S. Franckowiak, A. Franke, R. Frantzen, K. Fuchs, T. Gaisser, T. K. Gallagher, J. Gerhardt, L. Gladstone, L. Gluesenkamp, T. Goldschmidt, A. Golup, G. Goodman, J. A. Gora, D. Grant, D. Gross, A. Grullon, S. Gurtner, M. Ha, C. Ismail, A. Haj Hallgren, A. Halzen, F. Hanson, K. Heereman, D. Heimann, P. Heinen, D. Helbing, K. Hellauer, R. Hickford, S. Hill, G. C. Hoffman, K. D. Hoffmann, R. Homeier, A. Hoshina, K. Huelsnitz, W. Hulth, P. O. Hultqvist, K. Hussain, S. Ishihara, A. Jacobi, E. Jacobsen, J. Japaridze, G. S. Jlelati, O. Kappes, A. Karg, T. Karle, A. Kiryluk, J. Kislat, F. Klaes, J. Klein, S. R. Koehne, J. -H. Kohnen, G. Kolanoski, H. Koepke, L. Kopper, C. Kopper, S. Koskinen, D. J. Kowalski, M. Krasberg, M. Kroll, G. Kunnen, J. Kurahashi, N. Kuwabara, T. Labare, M. Landsman, H. Larson, M. J. Lauer, R. Lesiak-Bzdak, M. Unemann, J. L. Madsen, J. Maruyama, R. Mase, K. Matis, H. S. McNally, F. Meagher, K. Merck, M. Meszaros, P. Meures, T. Miarecki, S. Middell, E. Milke, N. Miller, J. Mohrmann, L. Montaruli, T. Morse, R. Nahnhauer, R. Naumann, U. Nowicki, S. C. Nygren, D. R. Obertacke, A. Odrowski, S. Olivas, A. Olivo, M. O'Murchadha, A. Panknin, S. Paul, L. Pepper, J. A. de los Heros, C. Perez Pieloth, D. Pirk, N. Posselt, J. Price, P. B. Przybylski, G. T. Raedel, L. Rawlins, K. Redl, P. Resconi, E. Rhode, W. Ribordy, M. Richman, M. Riedel, B. Rodrigues, J. P. Rothmaier, F. Rott, C. Ruhe, T. Ruzybayev, B. Ryckbosch, D. Saba, S. M. Salameh, T. Sander, H. -G. Santander, M. Sarkar, S. Schatto, K. Scheel, M. Scheriau, F. Schmidt, T. Schmitz, M. Schoenen, S. Schoeneberg, S. Schoenherr, L. Schoenwald, A. Schukraft, A. Schulte, L. Schulz, O. Seckel, D. Seo, S. H. Sestayo, Y. Seunarine, S. Sheremata, C. Smith, M. W. E. Soiron, M. Soldin, D. Spiczak, G. M. Spiering, C. Stamatikos, M. Stanev, T. Stasik, A. Stezelberger, T. Stokstad, R. G. Stoessl, A. Strahler, E. A. Stroem, R. Sullivan, G. W. Taavola, H. Taboada, I. Tamburro, A. Ter-Antonyan, S. Tilav, S. Toale, P. A. Toscano, S. Usner, M. van der Drift, D. van Eijndhoven, N. Van Overloop, A. van Santen, J. Vehring, M. Voge, M. Vraeghe, M. Walck, C. Waldenmaier, T. Wallraff, M. Walter, M. Wasserman, R. Weaver, Ch. Wendt, C. Westerhoff, S. Whitehorn, N. Wiebe, K. Wiebusch, C. H. Williams, D. R. Wissing, H. Wolf, M. Wood, T. R. Woschnagg, K. Xu, C. Xu, D. L. Xu, X. W. Yanez, J. P. Yodh, G. Yoshida, S. Zarzhitsky, P. Ziemann, J. Zierke, S. Zilles, A. Zoll, M. Hallgren, Allan/A-8963-2013; Beatty, James/D-9310-2011; Sarkar, Subir/G-5978-2011; Tjus, Julia/G-8145-2012; Wiebusch, Christopher/G-6490-2012; Auffenberg, Jan/D-3954-2014; Koskinen, David/G-3236-2014 Sarkar, Subir/0000-0002-3542-858X; Auffenberg, Jan/0000-0002-1185-9094; Koskinen, David/0000-0002-0514-5917 US National Science Foundation-Office of Polar Programs; US National Science Foundation-Physics Division; University of Wisconsin Alumni Research Foundation; Grid Laboratory Of Wisconsin (GLOW) grid infrastructure at the University of Wisconsin-Madison; Open Science Grid (OSG) grid infrastructure; US Department of Energy; National Energy Research Scientific Computing Center; Louisiana Optical Network Initiative (LONI) grid computing resources; National Science and Engineering Research Council of Canada; Swedish Research Council; Swedish Polar Research Secretariat; Swedish National Infrastructure for Computing (SNIC); Knut and Alice Wallenberg Foundation, Sweden; German Ministry for Education and Research (BMBF); Deutsche Forschungsgemeinschaft (DFG); Research Department of Plasmas with Complex Interactions (Bochum), Germany; Fund for Scientific Research (FNRS-FWO); FWO Odysseus programme; Flanders Institute to encourage scientific and technological research in industry (IWT); Belgian Federal Science Policy Office (Belspo); University of Oxford, United Kingdom; Marsden Fund, New Zealand; Australian Research Council; Japan Society for Promotion of Science (JSPS); Swiss National Science Foundation (SNSF), Switzerland We acknowledge the support from the following agencies: US National Science Foundation-Office of Polar Programs, US National Science Foundation-Physics Division, University of Wisconsin Alumni Research Foundation, the Grid Laboratory Of Wisconsin (GLOW) grid infrastructure at the University of Wisconsin-Madison, the Open Science Grid (OSG) grid infrastructure; US Department of Energy, and National Energy Research Scientific Computing Center, the Louisiana Optical Network Initiative (LONI) grid computing resources; National Science and Engineering Research Council of Canada; Swedish Research Council, Swedish Polar Research Secretariat, Swedish National Infrastructure for Computing (SNIC), and Knut and Alice Wallenberg Foundation, Sweden; German Ministry for Education and Research (BMBF), Deutsche Forschungsgemeinschaft (DFG), Research Department of Plasmas with Complex Interactions (Bochum), Germany; Fund for Scientific Research (FNRS-FWO), FWO Odysseus programme, Flanders Institute to encourage scientific and technological research in industry (IWT), Belgian Federal Science Policy Office (Belspo); University of Oxford, United Kingdom; Marsden Fund, New Zealand; Australian Research Council; Japan Society for Promotion of Science (JSPS); the Swiss National Science Foundation (SNSF), Switzerland. 15 Iop publishing ltd Bristol Astronomy & Astrophysics

Available from: 2015-06-12 Created: 2015-05-13 Last updated: 2015-06-12

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