Observation of cosmic-ray anisotropy with the IceTop air shower array
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...
Published in: | The Astrophysical Journal |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2013
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Online Access: | https://biblio.ugent.be/publication/3243062 http://hdl.handle.net/1854/LU-3243062 https://doi.org/10.1088/0004-637X/765/1/55 https://biblio.ugent.be/publication/3243062/file/3248299 |
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openpolar |
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Open Polar |
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Ghent University Academic Bibliography |
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ftunivgent |
language |
English |
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Physics and Astronomy ARRIVAL DIRECTIONS ASTRONOMY cosmic rays ICECUBE SPECTRUM astroparticle physics |
spellingShingle |
Physics and Astronomy ARRIVAL DIRECTIONS ASTRONOMY cosmic rays ICECUBE SPECTRUM astroparticle physics Aartsen, MG Abbasi, R Abdou, Yasser Ackermann, M Adams, J Aguilar, JA Ahlers, M Altmann, D Andeen, K Auffenberg, J Bai, X Baker, M Barwick, SW Baum, V Bay, R Beattie, K Beatty, JJ Bechet, S Tjus, JB Becker, KH Bell, M Benabderrahmane, ML BenZvi, S Berdermann, J Berghaus, P Berley, D Bernardini, E Bertrand, D Besson, DZ Bindig, D Bissok, M Blaufuss, E Blumenthal, J Boersma, DJ Bohaichuk, S Bohm, C Bose, D Boser, S Botner, O Brayeur, L Brown, AM Bruijn, R Brunner, J Carson, Michael Casey, J Casier, M Chirkin, D Christy, B Clark, K Clevermann, F Cohen, S Cowen, DF Silva, AHC Danninger, M Daughhetee, J Davis, JC De Clercq, C De Ridder, Sam Descamps, Freija Desiati, P De Vries-Uiterweerd, Garmt DeYoung, T Diaz-Velez, JC Dreyer, J Dumm, JP Dunkman, M Eagan, R Eisch, J Ellsworth, RW Engdegard, O Euler, S Evenson, PA Fadiran, O Fazely, AR Fedynitch, A Feintzeig, J Feusels, Tom Filimonov, K Finley, C Fischer-Wasels, T Flis, S Franckowiak, A Franke, R Frantzen, K Fuchs, T Gaisser, TK Gallagher, J Gerhardt, L Gladstone, L Glusenkamp, T Goldschmidt, A Golup, G Goodman, JA Gora, D Grant, D Gross, A Grullon, S Gurtner, M Ha, C Haj Ismail, Abd Al Karim Hallgren, A Halzen, F Hanson, K Heereman, D Heimann, P Heinen, D Helbing, K Hellauer, R Hickford, S Hill, GC Hoffman, KD Hoffmann, R Homeier, A Hoshina, K Huelsnitz, W Hulth, PO Hultqvist, K Hussain, S Ishihara, A Jacobi, E Jacobsen, J Japaridze, GS Jlelati, Ola Kappes, A Karg, T Karle, A Kiryluk, J Kislat, F Klas, J Klein, SR Kohne, JH Kohnen, G Kolanoski, H Kopke, L Kopper, C Kopper, S Koskinen, DJ Kowalski, M Krasberg, M Kroll, G Kunnen, J Kurahashi, N Kuwabara, T Labare, Mathieu Landsman, H Larson, MJ Lauer, R Lesiak-Bzdak, M Unemann, JL Madsen, J Maruyama, R Mase, K Matis, HS 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, SC Nygren, DR Obertacke, A Odrowski, S Olivas, A Olivo, M O'Murchadha, A Panknin, S Paul, L Pepper, JA de los Heros, CP Pieloth, D Pirk, N Posselt, J Price, PB Przybylski, GT Radel, L Rawlins, K Redl, P Resconi, E Rhode, W Ribordy, M Richman, M Riedel, B Rodrigues, JP Rothmaier, F Rott, C Ruhe, T Ruzybayev, B Ryckbosch, Dirk Saba, SM Salameh, T Sander, HG Santander, M Sarkar, S Schatto, K Scheel, M Scheriau, F Schmidt, T Schmitz, M Schoenen, S Schoneberg, S Schonherr, L Schonwald, A Schukraft, A Schulte, L Schulz, O Seckel, D Seo, SH Sestayo, Y Seunarine, S Sheremata, C Smith, MWE Soiron, M Soldin, D Spiczak, GM Spiering, C Stamatikos, M Stanev, T Stasik, A Stezelberger, T Stokstad, RG Stossl, A Strahler, EA Strom, R Sullivan, GW Taavola, H Taboada, I Tamburro, A Ter-Antonyan, S Tilav, S Toale, PA Toscano, S Usner, M van der Drift, D van Eijndhoven, N Van Overloop, Arne van Santen, J Vehring, M Voge, M Vraeghe, Matthias Walck, C Waldenmaier, T Wallraff, M Walter, M Wasserman, R Weaver, C Wendt, C Westerhoff, S Whitehorn, N Wiebe, K Wiebusch, CH Williams, DR Wissing, H Wolf, M Wood, TR Woschnagg, K Xu, C Xu, DL Xu, XW Yanez, JP Yodh, G Yoshida, S Zarzhitsky, P Ziemann, J Zierke, S Zilles, A Zoll, M Observation of cosmic-ray anisotropy with the IceTop air shower array |
topic_facet |
Physics and Astronomy ARRIVAL DIRECTIONS ASTRONOMY cosmic rays ICECUBE SPECTRUM astroparticle physics |
description |
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). |
format |
Article in Journal/Newspaper |
author |
Aartsen, MG Abbasi, R Abdou, Yasser Ackermann, M Adams, J Aguilar, JA Ahlers, M Altmann, D Andeen, K Auffenberg, J Bai, X Baker, M Barwick, SW Baum, V Bay, R Beattie, K Beatty, JJ Bechet, S Tjus, JB Becker, KH Bell, M Benabderrahmane, ML BenZvi, S Berdermann, J Berghaus, P Berley, D Bernardini, E Bertrand, D Besson, DZ Bindig, D Bissok, M Blaufuss, E Blumenthal, J Boersma, DJ Bohaichuk, S Bohm, C Bose, D Boser, S Botner, O Brayeur, L Brown, AM Bruijn, R Brunner, J Carson, Michael Casey, J Casier, M Chirkin, D Christy, B Clark, K Clevermann, F Cohen, S Cowen, DF Silva, AHC Danninger, M Daughhetee, J Davis, JC De Clercq, C De Ridder, Sam Descamps, Freija Desiati, P De Vries-Uiterweerd, Garmt DeYoung, T Diaz-Velez, JC Dreyer, J Dumm, JP Dunkman, M Eagan, R Eisch, J Ellsworth, RW Engdegard, O Euler, S Evenson, PA Fadiran, O Fazely, AR Fedynitch, A Feintzeig, J Feusels, Tom Filimonov, K Finley, C Fischer-Wasels, T Flis, S Franckowiak, A Franke, R Frantzen, K Fuchs, T Gaisser, TK Gallagher, J Gerhardt, L Gladstone, L Glusenkamp, T Goldschmidt, A Golup, G Goodman, JA Gora, D Grant, D Gross, A Grullon, S Gurtner, M Ha, C Haj Ismail, Abd Al Karim Hallgren, A Halzen, F Hanson, K Heereman, D Heimann, P Heinen, D Helbing, K Hellauer, R Hickford, S Hill, GC Hoffman, KD Hoffmann, R Homeier, A Hoshina, K Huelsnitz, W Hulth, PO Hultqvist, K Hussain, S Ishihara, A Jacobi, E Jacobsen, J Japaridze, GS Jlelati, Ola Kappes, A Karg, T Karle, A Kiryluk, J Kislat, F Klas, J Klein, SR Kohne, JH Kohnen, G Kolanoski, H Kopke, L Kopper, C Kopper, S Koskinen, DJ Kowalski, M Krasberg, M Kroll, G Kunnen, J Kurahashi, N Kuwabara, T Labare, Mathieu Landsman, H Larson, MJ Lauer, R Lesiak-Bzdak, M Unemann, JL Madsen, J Maruyama, R Mase, K Matis, HS 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, SC Nygren, DR Obertacke, A Odrowski, S Olivas, A Olivo, M O'Murchadha, A Panknin, S Paul, L Pepper, JA de los Heros, CP Pieloth, D Pirk, N Posselt, J Price, PB Przybylski, GT Radel, L Rawlins, K Redl, P Resconi, E Rhode, W Ribordy, M Richman, M Riedel, B Rodrigues, JP Rothmaier, F Rott, C Ruhe, T Ruzybayev, B Ryckbosch, Dirk Saba, SM Salameh, T Sander, HG Santander, M Sarkar, S Schatto, K Scheel, M Scheriau, F Schmidt, T Schmitz, M Schoenen, S Schoneberg, S Schonherr, L Schonwald, A Schukraft, A Schulte, L Schulz, O Seckel, D Seo, SH Sestayo, Y Seunarine, S Sheremata, C Smith, MWE Soiron, M Soldin, D Spiczak, GM Spiering, C Stamatikos, M Stanev, T Stasik, A Stezelberger, T Stokstad, RG Stossl, A Strahler, EA Strom, R Sullivan, GW Taavola, H Taboada, I Tamburro, A Ter-Antonyan, S Tilav, S Toale, PA Toscano, S Usner, M van der Drift, D van Eijndhoven, N Van Overloop, Arne van Santen, J Vehring, M Voge, M Vraeghe, Matthias Walck, C Waldenmaier, T Wallraff, M Walter, M Wasserman, R Weaver, C Wendt, C Westerhoff, S Whitehorn, N Wiebe, K Wiebusch, CH Williams, DR Wissing, H Wolf, M Wood, TR Woschnagg, K Xu, C Xu, DL Xu, XW Yanez, JP Yodh, G Yoshida, S Zarzhitsky, P Ziemann, J Zierke, S Zilles, A Zoll, M |
author_facet |
Aartsen, MG Abbasi, R Abdou, Yasser Ackermann, M Adams, J Aguilar, JA Ahlers, M Altmann, D Andeen, K Auffenberg, J Bai, X Baker, M Barwick, SW Baum, V Bay, R Beattie, K Beatty, JJ Bechet, S Tjus, JB Becker, KH Bell, M Benabderrahmane, ML BenZvi, S Berdermann, J Berghaus, P Berley, D Bernardini, E Bertrand, D Besson, DZ Bindig, D Bissok, M Blaufuss, E Blumenthal, J Boersma, DJ Bohaichuk, S Bohm, C Bose, D Boser, S Botner, O Brayeur, L Brown, AM Bruijn, R Brunner, J Carson, Michael Casey, J Casier, M Chirkin, D Christy, B Clark, K Clevermann, F Cohen, S Cowen, DF Silva, AHC Danninger, M Daughhetee, J Davis, JC De Clercq, C De Ridder, Sam Descamps, Freija Desiati, P De Vries-Uiterweerd, Garmt DeYoung, T Diaz-Velez, JC Dreyer, J Dumm, JP Dunkman, M Eagan, R Eisch, J Ellsworth, RW Engdegard, O Euler, S Evenson, PA Fadiran, O Fazely, AR Fedynitch, A Feintzeig, J Feusels, Tom Filimonov, K Finley, C Fischer-Wasels, T Flis, S Franckowiak, A Franke, R Frantzen, K Fuchs, T Gaisser, TK Gallagher, J Gerhardt, L Gladstone, L Glusenkamp, T Goldschmidt, A Golup, G Goodman, JA Gora, D Grant, D Gross, A Grullon, S Gurtner, M Ha, C Haj Ismail, Abd Al Karim Hallgren, A Halzen, F Hanson, K Heereman, D Heimann, P Heinen, D Helbing, K Hellauer, R Hickford, S Hill, GC Hoffman, KD Hoffmann, R Homeier, A Hoshina, K Huelsnitz, W Hulth, PO Hultqvist, K Hussain, S Ishihara, A Jacobi, E Jacobsen, J Japaridze, GS Jlelati, Ola Kappes, A Karg, T Karle, A Kiryluk, J Kislat, F Klas, J Klein, SR Kohne, JH Kohnen, G Kolanoski, H Kopke, L Kopper, C Kopper, S Koskinen, DJ Kowalski, M Krasberg, M Kroll, G Kunnen, J Kurahashi, N Kuwabara, T Labare, Mathieu Landsman, H Larson, MJ Lauer, R Lesiak-Bzdak, M Unemann, JL Madsen, J Maruyama, R Mase, K Matis, HS 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, SC Nygren, DR Obertacke, A Odrowski, S Olivas, A Olivo, M O'Murchadha, A Panknin, S Paul, L Pepper, JA de los Heros, CP Pieloth, D Pirk, N Posselt, J Price, PB Przybylski, GT Radel, L Rawlins, K Redl, P Resconi, E Rhode, W Ribordy, M Richman, M Riedel, B Rodrigues, JP Rothmaier, F Rott, C Ruhe, T Ruzybayev, B Ryckbosch, Dirk Saba, SM Salameh, T Sander, HG Santander, M Sarkar, S Schatto, K Scheel, M Scheriau, F Schmidt, T Schmitz, M Schoenen, S Schoneberg, S Schonherr, L Schonwald, A Schukraft, A Schulte, L Schulz, O Seckel, D Seo, SH Sestayo, Y Seunarine, S Sheremata, C Smith, MWE Soiron, M Soldin, D Spiczak, GM Spiering, C Stamatikos, M Stanev, T Stasik, A Stezelberger, T Stokstad, RG Stossl, A Strahler, EA Strom, R Sullivan, GW Taavola, H Taboada, I Tamburro, A Ter-Antonyan, S Tilav, S Toale, PA Toscano, S Usner, M van der Drift, D van Eijndhoven, N Van Overloop, Arne van Santen, J Vehring, M Voge, M Vraeghe, Matthias Walck, C Waldenmaier, T Wallraff, M Walter, M Wasserman, R Weaver, C Wendt, C Westerhoff, S Whitehorn, N Wiebe, K Wiebusch, CH Williams, DR Wissing, H Wolf, M Wood, TR Woschnagg, K Xu, C Xu, DL Xu, XW Yanez, JP Yodh, G Yoshida, S Zarzhitsky, P Ziemann, J Zierke, S Zilles, A Zoll, M |
author_sort |
Aartsen, MG |
title |
Observation of cosmic-ray anisotropy with the IceTop air shower array |
title_short |
Observation of cosmic-ray anisotropy with the IceTop air shower array |
title_full |
Observation of cosmic-ray anisotropy with the IceTop air shower array |
title_fullStr |
Observation of cosmic-ray anisotropy with the IceTop air shower array |
title_full_unstemmed |
Observation of cosmic-ray anisotropy with the IceTop air shower array |
title_sort |
observation of cosmic-ray anisotropy with the icetop air shower array |
publishDate |
2013 |
url |
https://biblio.ugent.be/publication/3243062 http://hdl.handle.net/1854/LU-3243062 https://doi.org/10.1088/0004-637X/765/1/55 https://biblio.ugent.be/publication/3243062/file/3248299 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
ASTROPHYSICAL JOURNAL ISSN: 0004-637X |
op_relation |
https://biblio.ugent.be/publication/3243062 http://hdl.handle.net/1854/LU-3243062 http://dx.doi.org/10.1088/0004-637X/765/1/55 https://biblio.ugent.be/publication/3243062/file/3248299 |
op_rights |
No license (in copyright) info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1088/0004-637X/765/1/55 |
container_title |
The Astrophysical Journal |
container_volume |
765 |
container_issue |
1 |
container_start_page |
55 |
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1778533611048271872 |
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ftunivgent:oai:archive.ugent.be:3243062 2023-10-01T03:59:30+02:00 Observation of cosmic-ray anisotropy with the IceTop air shower array Aartsen, MG Abbasi, R Abdou, Yasser Ackermann, M Adams, J Aguilar, JA Ahlers, M Altmann, D Andeen, K Auffenberg, J Bai, X Baker, M Barwick, SW Baum, V Bay, R Beattie, K Beatty, JJ Bechet, S Tjus, JB Becker, KH Bell, M Benabderrahmane, ML BenZvi, S Berdermann, J Berghaus, P Berley, D Bernardini, E Bertrand, D Besson, DZ Bindig, D Bissok, M Blaufuss, E Blumenthal, J Boersma, DJ Bohaichuk, S Bohm, C Bose, D Boser, S Botner, O Brayeur, L Brown, AM Bruijn, R Brunner, J Carson, Michael Casey, J Casier, M Chirkin, D Christy, B Clark, K Clevermann, F Cohen, S Cowen, DF Silva, AHC Danninger, M Daughhetee, J Davis, JC De Clercq, C De Ridder, Sam Descamps, Freija Desiati, P De Vries-Uiterweerd, Garmt DeYoung, T Diaz-Velez, JC Dreyer, J Dumm, JP Dunkman, M Eagan, R Eisch, J Ellsworth, RW Engdegard, O Euler, S Evenson, PA Fadiran, O Fazely, AR Fedynitch, A Feintzeig, J Feusels, Tom Filimonov, K Finley, C Fischer-Wasels, T Flis, S Franckowiak, A Franke, R Frantzen, K Fuchs, T Gaisser, TK Gallagher, J Gerhardt, L Gladstone, L Glusenkamp, T Goldschmidt, A Golup, G Goodman, JA Gora, D Grant, D Gross, A Grullon, S Gurtner, M Ha, C Haj Ismail, Abd Al Karim Hallgren, A Halzen, F Hanson, K Heereman, D Heimann, P Heinen, D Helbing, K Hellauer, R Hickford, S Hill, GC Hoffman, KD Hoffmann, R Homeier, A Hoshina, K Huelsnitz, W Hulth, PO Hultqvist, K Hussain, S Ishihara, A Jacobi, E Jacobsen, J Japaridze, GS Jlelati, Ola Kappes, A Karg, T Karle, A Kiryluk, J Kislat, F Klas, J Klein, SR Kohne, JH Kohnen, G Kolanoski, H Kopke, L Kopper, C Kopper, S Koskinen, DJ Kowalski, M Krasberg, M Kroll, G Kunnen, J Kurahashi, N Kuwabara, T Labare, Mathieu Landsman, H Larson, MJ Lauer, R Lesiak-Bzdak, M Unemann, JL Madsen, J Maruyama, R Mase, K Matis, HS 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, SC Nygren, DR Obertacke, A Odrowski, S Olivas, A Olivo, M O'Murchadha, A Panknin, S Paul, L Pepper, JA de los Heros, CP Pieloth, D Pirk, N Posselt, J Price, PB Przybylski, GT Radel, L Rawlins, K Redl, P Resconi, E Rhode, W Ribordy, M Richman, M Riedel, B Rodrigues, JP Rothmaier, F Rott, C Ruhe, T Ruzybayev, B Ryckbosch, Dirk Saba, SM Salameh, T Sander, HG Santander, M Sarkar, S Schatto, K Scheel, M Scheriau, F Schmidt, T Schmitz, M Schoenen, S Schoneberg, S Schonherr, L Schonwald, A Schukraft, A Schulte, L Schulz, O Seckel, D Seo, SH Sestayo, Y Seunarine, S Sheremata, C Smith, MWE Soiron, M Soldin, D Spiczak, GM Spiering, C Stamatikos, M Stanev, T Stasik, A Stezelberger, T Stokstad, RG Stossl, A Strahler, EA Strom, R Sullivan, GW Taavola, H Taboada, I Tamburro, A Ter-Antonyan, S Tilav, S Toale, PA Toscano, S Usner, M van der Drift, D van Eijndhoven, N Van Overloop, Arne van Santen, J Vehring, M Voge, M Vraeghe, Matthias Walck, C Waldenmaier, T Wallraff, M Walter, M Wasserman, R Weaver, C Wendt, C Westerhoff, S Whitehorn, N Wiebe, K Wiebusch, CH Williams, DR Wissing, H Wolf, M Wood, TR Woschnagg, K Xu, C Xu, DL Xu, XW Yanez, JP Yodh, G Yoshida, S Zarzhitsky, P Ziemann, J Zierke, S Zilles, A Zoll, M 2013 application/pdf https://biblio.ugent.be/publication/3243062 http://hdl.handle.net/1854/LU-3243062 https://doi.org/10.1088/0004-637X/765/1/55 https://biblio.ugent.be/publication/3243062/file/3248299 eng eng https://biblio.ugent.be/publication/3243062 http://hdl.handle.net/1854/LU-3243062 http://dx.doi.org/10.1088/0004-637X/765/1/55 https://biblio.ugent.be/publication/3243062/file/3248299 No license (in copyright) info:eu-repo/semantics/openAccess ASTROPHYSICAL JOURNAL ISSN: 0004-637X Physics and Astronomy ARRIVAL DIRECTIONS ASTRONOMY cosmic rays ICECUBE SPECTRUM astroparticle physics journalArticle info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2013 ftunivgent https://doi.org/10.1088/0004-637X/765/1/55 2023-09-06T22:34:51Z 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). Article in Journal/Newspaper South pole Ghent University Academic Bibliography South Pole The Astrophysical Journal 765 1 55 |