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Finley, C. Ha, Ch. Weaver, C. H. Wiebusch, C. Kopper, C. P\\'erez de los Heros, C. Rott, C. Sheremata, C. Spiering, C. Walck, C. Wendt, C. Xu, D. Altmann, D. Berley, D. Bertrand, D. Bindig, D. Bose, D. Chirkin, D. F. Cowen, D. G\\'ora, D. Grant, D. Heereman, D. Heinen, D. J. Boersma, D. J. Koskinen, D. L. Xu, D. Pieloth, D. R. Nygren, D. R. Williams, D. Ryckbosch, D. Seckel, D. Soldin, D. va. de. Drift, D. Z. Besson, E. A. Strahler, E. Bernardini, E. Blaufuss, E. Jacobi, E. Middell, E. Resconi, F. Clevermann, F. Descamps, F. Halzen, F. Kislat, F. McNally, F. Rothmaier, F. Scheriau, G. C. Hill, G. d. Vries-Uiterweerd, G. Golup, G. Kohnen, G. Kroll, G. M. Spiczak, G. S. Japaridze, G. T. Przybylski, G. W. Sullivan, G. Yodh, H.-G. Sander, H. Kolanoski, H. Landsman, H. S. Matis, H. Taavola, H. Wissing, IceCube Collaboration: M. G. Aartsen, I. Taboada, J. A. Aguilar, J. Adams, J. A. Goodman, J. A. Pepper, J. Auffenberg, J. Becker Tjus, J. Berdermann, J. Blumenthal, J. Brunner, J. Casey, J. C. Davis, J. C. D\\'iaz-V\\'elez, J. Daughhetee, J. Dreyer, J. Eisch, J. Feintzeig, J. Gallagher, J.-H. K\\\"ohne, J. Jacobsen, J. J. Beatty, J. Kiryluk, J. Kl\\\"as, J. Kunnen, J. L\\\"unemann, J. Madsen, J. Miller, J. P. Dumm, J. Posselt, J. P. Rodrigues, J. P. Yanez, J. va. Santen, J. Ziemann, K. Andeen, K. Beattie, K. Clark, K. D. Hoffman, K. Filimonov, K. Frantzen, K. Hanson, K.-H. Becker, K. Helbing, K. Hoshina, K. Hultqvist, K. Mase, K. Meagher, K. Rawlins, K. Schatto, K. Wiebe, K. Woschnagg, L. Brayeur, L. Gerhardt, L. Gladstone, L. K\\\"opke, L. Mohrmann, L. Paul, L. R\\\"adel, L. Sch\\\"onherr, L. Schulte, M. Ackermann, M. Ahlers, M. Baker, M. Bell, M. Bissok, M. Carson, M. Casier, M. Danninger, M. Dunkman, M. Gurtner, M. J. Larson, M. Kowalski, M. Krasberg, M. Labare, M. L. Benabderrahmane, M. Lesiak-Bzdak, M. Merck, M. Olivo, M. Ribordy, M. Richman, M. Santander, M. Scheel, M. Schmitz, M. Soiron, M. Stamatikos, M. Usner, M. Vehring, M. Voge, M. Vraeghe, M. Wallraff, M. Walter, M. W. E. Smith, M. Wolf, M. Zoll, N. Kurahashi, N. Milke, N. Pirk, N. va. Eijndhoven, N. Whitehorn, O. Botner, O. Engdeg{\\aa}rd, O. Fadiran, O. Jlelati, O. Schulz, P. A. Evenson, P. A. Toale, P. Berghaus, P. B. Price, P. Desiati, P. Heimann, P. M\\'esz\\'aros, P. O. Hulth, P. Redl, P. Zarzhitsky, R. Abbasi, R. Bay, R. Bruijn, R. Eagan, R. Franke, R. G. Stokstad, R. Hellauer, R. Hoffmann, R. Lauer, R. Maruyama, R. Morse, R. Nahnhauer, R. Str\\\"om, R. Wasserman, R. W. Ellsworth, S. Bechet, S. BenZvi, S. Bohaichuk, S. B\\\"oser, S. C. Nowicki, S. Cohen, S. D. Ridder, S. Euler, S. Flis, S. Grullon, S. Hickford, S. H. Seo, S. Hussain, S. Kopper, S. Miarecki, S. M. Saba, S. Odrowski, S. Panknin, S. R. Klein, S. Sarkar, S. Schoenen, S. Sch\\\"oneberg, S. Seunarine, S. Ter-Antonyan, S. Tilav, S. Toscano, S. W. Barwick, S. Westerhoff, S. Yoshida, S. Zierke, T. DeYoung, T. Feusels, T. Fischer-Wasels, T. Fuchs, T. Gl\\\"usenkamp, T. Karg, T. K. Gaisser, T. Kuwabara, T. Meures, T. Montaruli, T. Ruhe, T. R. Wood, T. Salameh, T. Schmidt, T. Stanev, T. Stezelberger, T. Waldenmaier, U. Naumann, V. Baum, W. Huelsnitz, W. Rhode, X. Bai, X. W. Xu, Y. Abdou, Y. Sestayo","submitted_at":"2012-10-18T23:16:43Z","abstract_excerpt":"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. 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Fedynitch, A. Franckowiak, A. Goldschmidt, A. Gro{\\ss}, A. Ha. Ismail, A. Hallgren, A. H. Cru. Silva, A. Homeier, A. Ishihara, A. Kappes, A. Karle, A. M. Brown, A. Obertacke, A. Olivas, A. O'Murchadha, A. R. Fazely, A. Sch\\\"onwald, A. Schukraft, A. Stasik, A. St\\\"o{\\ss}l, A. Tamburro, A. Va. Overloop, A. Zilles, B. Christy, B. Riedel, B. Ruzybayev, C. Bohm, C. D. Clercq, C. Finley, C. Ha, Ch. Weaver, C. H. Wiebusch, C. Kopper, C. P\\'erez de los Heros, C. Rott, C. Sheremata, C. Spiering, C. Walck, C. Wendt, C. Xu, D. Altmann, D. Berley, D. Bertrand, D. Bindig, D. Bose, D. Chirkin, D. F. Cowen, D. G\\'ora, D. Grant, D. Heereman, D. Heinen, D. J. Boersma, D. J. Koskinen, D. L. Xu, D. Pieloth, D. R. Nygren, D. R. Williams, D. Ryckbosch, D. Seckel, D. Soldin, D. va. de. Drift, D. Z. Besson, E. A. Strahler, E. Bernardini, E. Blaufuss, E. Jacobi, E. Middell, E. Resconi, F. Clevermann, F. Descamps, F. Halzen, F. Kislat, F. McNally, F. Rothmaier, F. Scheriau, G. C. Hill, G. d. 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