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, Mohamed Lotfi BenabderrhmaneS. 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

Research output: Contribution to journalArticle

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 (US)
Article number16
JournalAstrophysical Journal
Volume740
Issue number1
DOIs
StatePublished - Oct 10 2011

Fingerprint

cosmic ray
arrivals
anisotropy
cosmic rays
quadrupoles
Southern sky
dipoles
Southern Hemisphere
declination
probe
cosmic ray showers
spectrum analysis
power spectra
muons
air
poles
neutrinos
energy
probes
detectors

Keywords

  • astroparticle physics
  • cosmic rays

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with icecube. / Abbasi, R.; Abdou, Y.; Abu-Zayyad, T.; Adams, J.; Aguilar, J. A.; Ahlers, M.; Altmann, D.; Andeen, K.; Auffenberg, J.; Bai, X.; Baker, M.; Barwick, S. W.; Bay, R.; Bazo Alba, J. L.; Beattie, K.; Beatty, J. J.; Bechet, S.; Becker, J. K.; Becker, K. H.; Lotfi Benabderrhmane, Mohamed; 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.; Bohm, C.; Bose, D.; Böser, S.; Botner, O.; Brown, A. M.; Buitink, S.; Caballero-Mora, K. S.; Carson, M.; Chirkin, D.; Christy, B.; Clem, J.; Clevermann, F.; Cohen, S.; Colnard, C.; Cowen, D. F.; D'Agostino, M. V.; Danninger, M.; Daughhetee, J.; Davis, J. C.; De Clercq, C.; Demirörs, L.; Denger, T.; Depaepe, O.; Descamps, F.; Desiati, P.; De Vries-Uiterweerd, G.; DeYoung, T.; Díaz-Vélez, J. C.; Dierckxsens, M.; Dreyer, J.; Dumm, J. P.; Ehrlich, R.; Eisch, J.; Ellsworth, R. W.; Engdegård, O.; Euler, S.; Evenson, P. A.; Fadiran, O.; Fazely, A. R.; Fedynitch, A.; Feintzeig, J.; Feusels, T.; Filimonov, K.; Finley, C.; Fischer-Wasels, T.; Foerster, M. M.; Fox, B. D.; Franckowiak, A.; Franke, R.; Gaisser, T. K.; Gallagher, J.; Gerhardt, L.; Gladstone, L.; Gl̈usenkamp, T.; Goldschmidt, A.; Goodman, J. A.; Gora, D.; Grant, D.; Griesel, T.; Groß, A.; Grullon, S.; Gurtner, M.; Ha, C.; Hajismail, A.; Hallgren, A.; Halzen, F.; Han, K.; Hanson, K.; Heinen, D.; Helbing, K.; Herquet, P.; Hickford, S.; Hill, G. C.; Hoffman, K. D.; Homeier, A.; Hoshina, K.; Hubert, D.; Huelsnitz, W.; Hülß, J. P.; Hulth, P. O.; Hultqvist, K.; Hussain, S.; Ishihara, A.; Jacobsen, J.; Japaridze, G. S.; Johansson, H.; Joseph, J. M.; Kampert, K. H.; Kappes, A.; Karg, T.; Karle, A.; Kenny, P.; Kiryluk, J.; Kislat, F.; Klein, S. R.; Köhne, J. H.; Kohnen, G.; Kolanoski, H.; Köpke, L.; Kopper, S.; Koskinen, D. J.; Kowalski, M.; Kowarik, T.; Krasberg, M.; Krings, T.; Kroll, G.; Kurahashi, N.; Kuwabara, T.; Labare, M.; Lafebre, S.; Laihem, K.; Landsman, H.; Larson, M. J.; Lauer, R.; L̈unemann, J.; Madajczyk, B.; Madsen, J.; Majumdar, P.; Marotta, A.; Maruyama, R.; Mase, K.; Matis, H. S.; Meagher, K.; Merck, M.; Ḿesźaros, P.; Meures, T.; Middell, E.; Milke, N.; Miller, J.; Montaruli, T.; Morse, R.; Movit, S. M.; Nahnhauer, R.; Nam, J. W.; Naumann, U.; Nießen, P.; Nygren, D. R.; Odrowski, S.; Olivas, A.; Olivo, M.; O'Murchadha, A.; Ono, M.; Panknin, S.; Paul, L.; Pérez De Los Heros, C.; Petrovic, J.; Piegsa, A.; Pieloth, D.; Porrata, R.; Posselt, J.; Price, C. C.; Price, P. B.; Przybylski, G. T.; Rawlins, K.; Redl, P.; Resconi, E.; Rhode, W.; Ribordy, M.; Rizzo, A.; Rodrigues, J. P.; Roth, P.; Rothmaier, F.; Rott, C.; Ruhe, T.; Rutledge, D.; Ruzybayev, B.; Ryckbosch, D.; Sander, H. G.; Santander, M.; Sarkar, S.; Schatto, K.; Schmidt, T.; Schönwald, A.; Schukraft, A.; Schultes, A.; Schulz, O.; Schunck, M.; Seckel, D.; Semburg, B.; Seo, S. H.; Sestayo, Y.; Seunarine, S.; Silvestri, A.; Slipak, A.; Spiczak, G. M.; Spiering, C.; Stamatikos, M.; Stanev, T.; Stephens, G.; Stezelberger, T.; Stokstad, R. G.; Stössl, A.; Stoyanov, S.; Strahler, E. A.; Straszheim, T.; Stür, M.; Sullivan, G. W.; Swillens, Q.; Taavola, H.; Taboada, I.; Tamburro, A.; Tepe, A.; Ter-Antonyan, S.; Tilav, S.; Toale, P. A.; Toscano, S.; Tosi, D.; Tur.can, D.; Van Eijndhoven, N.; Vandenbroucke, J.; Van Overloop, A.; Van Santen, J.; Vehring, M.; Voge, M.; Walck, C.; Waldenmaier, T.; Wallraff, M.; Walter, M.; Weaver, Ch; Wendt, C.; Westerhoff, S.; Whitehorn, N.; Wiebe, K.; Wiebusch, C. H.; Williams, D. R.; Wischnewski, R.; Wissing, H.; Wolf, M.; Wood, T. R.; Woschnagg, K.; Xu, C.; Xu, X. W.; Yodh, G.; Yoshida, S.; Zarzhitsky, P.; Zoll, M.

In: Astrophysical Journal, Vol. 740, No. 1, 16, 10.10.2011.

Research output: Contribution to journalArticle

Abbasi, R, Abdou, Y, Abu-Zayyad, T, Adams, J, Aguilar, JA, Ahlers, M, Altmann, D, Andeen, K, Auffenberg, J, Bai, X, Baker, M, Barwick, SW, Bay, R, Bazo Alba, JL, Beattie, K, Beatty, JJ, Bechet, S, Becker, JK, Becker, KH, Lotfi Benabderrhmane, M, BenZvi, S, Berdermann, J, Berghaus, P, Berley, D, Bernardini, E, Bertrand, D, Besson, DZ, Bindig, D, Bissok, M, Blaufuss, E, Blumenthal, J, Boersma, DJ, Bohm, C, Bose, D, Böser, S, Botner, O, Brown, AM, Buitink, S, Caballero-Mora, KS, Carson, M, Chirkin, D, Christy, B, Clem, J, Clevermann, F, Cohen, S, Colnard, C, Cowen, DF, D'Agostino, MV, Danninger, M, Daughhetee, J, Davis, JC, De Clercq, C, Demirörs, L, Denger, T, Depaepe, O, Descamps, F, Desiati, P, De Vries-Uiterweerd, G, DeYoung, T, Díaz-Vélez, JC, Dierckxsens, M, Dreyer, J, Dumm, JP, Ehrlich, R, Eisch, J, Ellsworth, RW, Engdegård, O, Euler, S, Evenson, PA, Fadiran, O, Fazely, AR, Fedynitch, A, Feintzeig, J, Feusels, T, Filimonov, K, Finley, C, Fischer-Wasels, T, Foerster, MM, Fox, BD, Franckowiak, A, Franke, R, Gaisser, TK, Gallagher, J, Gerhardt, L, Gladstone, L, Gl̈usenkamp, T, Goldschmidt, A, Goodman, JA, Gora, D, Grant, D, Griesel, T, Groß, A, Grullon, S, Gurtner, M, Ha, C, Hajismail, A, Hallgren, A, Halzen, F, Han, K, Hanson, K, Heinen, D, Helbing, K, Herquet, P, Hickford, S, Hill, GC, Hoffman, KD, Homeier, A, Hoshina, K, Hubert, D, Huelsnitz, W, Hülß, JP, Hulth, PO, Hultqvist, K, Hussain, S, Ishihara, A, Jacobsen, J, Japaridze, GS, Johansson, H, Joseph, JM, Kampert, KH, Kappes, A, Karg, T, Karle, A, Kenny, P, Kiryluk, J, Kislat, F, Klein, SR, Köhne, JH, Kohnen, G, Kolanoski, H, Köpke, L, Kopper, S, Koskinen, DJ, Kowalski, M, Kowarik, T, Krasberg, M, Krings, T, Kroll, G, Kurahashi, N, Kuwabara, T, Labare, M, Lafebre, S, Laihem, K, Landsman, H, Larson, MJ, Lauer, R, L̈unemann, J, Madajczyk, B, Madsen, J, Majumdar, P, Marotta, A, Maruyama, R, Mase, K, Matis, HS, Meagher, K, Merck, M, Ḿesźaros, P, Meures, T, Middell, E, Milke, N, Miller, J, Montaruli, T, Morse, R, Movit, SM, Nahnhauer, R, Nam, JW, Naumann, U, Nießen, P, Nygren, DR, Odrowski, S, Olivas, A, Olivo, M, O'Murchadha, A, Ono, M, Panknin, S, Paul, L, Pérez De Los Heros, C, Petrovic, J, Piegsa, A, Pieloth, D, Porrata, R, Posselt, J, Price, CC, Price, PB, Przybylski, GT, Rawlins, K, Redl, P, Resconi, E, Rhode, W, Ribordy, M, Rizzo, A, Rodrigues, JP, Roth, P, Rothmaier, F, Rott, C, Ruhe, T, Rutledge, D, Ruzybayev, B, Ryckbosch, D, Sander, HG, Santander, M, Sarkar, S, Schatto, K, Schmidt, T, Schönwald, A, Schukraft, A, Schultes, A, Schulz, O, Schunck, M, Seckel, D, Semburg, B, Seo, SH, Sestayo, Y, Seunarine, S, Silvestri, A, Slipak, A, Spiczak, GM, Spiering, C, Stamatikos, M, Stanev, T, Stephens, G, Stezelberger, T, Stokstad, RG, Stössl, A, Stoyanov, S, Strahler, EA, Straszheim, T, Stür, M, Sullivan, GW, Swillens, Q, Taavola, H, Taboada, I, Tamburro, A, Tepe, A, Ter-Antonyan, S, Tilav, S, Toale, PA, Toscano, S, Tosi, D, Tur.can, D, Van Eijndhoven, N, Vandenbroucke, J, Van Overloop, A, Van Santen, J, Vehring, M, Voge, M, Walck, C, Waldenmaier, T, Wallraff, M, Walter, M, Weaver, C, Wendt, C, Westerhoff, S, Whitehorn, N, Wiebe, K, Wiebusch, CH, Williams, DR, Wischnewski, R, Wissing, H, Wolf, M, Wood, TR, Woschnagg, K, Xu, C, Xu, XW, Yodh, G, Yoshida, S, Zarzhitsky, P & Zoll, M 2011, 'Observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with icecube', Astrophysical Journal, vol. 740, no. 1, 16. https://doi.org/10.1088/0004-637X/740/1/16
Abbasi, R. ; Abdou, Y. ; Abu-Zayyad, T. ; Adams, J. ; Aguilar, J. A. ; Ahlers, M. ; Altmann, D. ; Andeen, K. ; Auffenberg, J. ; Bai, X. ; Baker, M. ; Barwick, S. W. ; Bay, R. ; Bazo Alba, J. L. ; Beattie, K. ; Beatty, J. J. ; Bechet, S. ; Becker, J. K. ; Becker, K. H. ; Lotfi Benabderrhmane, Mohamed ; 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. ; Bohm, C. ; Bose, D. ; Böser, S. ; Botner, O. ; Brown, A. M. ; Buitink, S. ; Caballero-Mora, K. S. ; Carson, M. ; Chirkin, D. ; Christy, B. ; Clem, J. ; Clevermann, F. ; Cohen, S. ; Colnard, C. ; Cowen, D. F. ; D'Agostino, M. V. ; Danninger, M. ; Daughhetee, J. ; Davis, J. C. ; De Clercq, C. ; Demirörs, L. ; Denger, T. ; Depaepe, O. ; Descamps, F. ; Desiati, P. ; De Vries-Uiterweerd, G. ; DeYoung, T. ; Díaz-Vélez, J. C. ; Dierckxsens, M. ; Dreyer, J. ; Dumm, J. P. ; Ehrlich, R. ; Eisch, J. ; Ellsworth, R. W. ; Engdegård, O. ; Euler, S. ; Evenson, P. A. ; Fadiran, O. ; Fazely, A. R. ; Fedynitch, A. ; Feintzeig, J. ; Feusels, T. ; Filimonov, K. ; Finley, C. ; Fischer-Wasels, T. ; Foerster, M. M. ; Fox, B. D. ; Franckowiak, A. ; Franke, R. ; Gaisser, T. K. ; Gallagher, J. ; Gerhardt, L. ; Gladstone, L. ; Gl̈usenkamp, T. ; Goldschmidt, A. ; Goodman, J. A. ; Gora, D. ; Grant, D. ; Griesel, T. ; Groß, A. ; Grullon, S. ; Gurtner, M. ; Ha, C. ; Hajismail, A. ; Hallgren, A. ; Halzen, F. ; Han, K. ; Hanson, K. ; Heinen, D. ; Helbing, K. ; Herquet, P. ; Hickford, S. ; Hill, G. C. ; Hoffman, K. D. ; Homeier, A. ; Hoshina, K. ; Hubert, D. ; Huelsnitz, W. ; Hülß, J. P. ; Hulth, P. O. ; Hultqvist, K. ; Hussain, S. ; Ishihara, A. ; Jacobsen, J. ; Japaridze, G. S. ; Johansson, H. ; Joseph, J. M. ; Kampert, K. H. ; Kappes, A. ; Karg, T. ; Karle, A. ; Kenny, P. ; Kiryluk, J. ; Kislat, F. ; Klein, S. R. ; Köhne, J. H. ; Kohnen, G. ; Kolanoski, H. ; Köpke, L. ; Kopper, S. ; Koskinen, D. J. ; Kowalski, M. ; Kowarik, T. ; Krasberg, M. ; Krings, T. ; Kroll, G. ; Kurahashi, N. ; Kuwabara, T. ; Labare, M. ; Lafebre, S. ; Laihem, K. ; Landsman, H. ; Larson, M. J. ; Lauer, R. ; L̈unemann, J. ; Madajczyk, B. ; Madsen, J. ; Majumdar, P. ; Marotta, A. ; Maruyama, R. ; Mase, K. ; Matis, H. S. ; Meagher, K. ; Merck, M. ; Ḿesźaros, P. ; Meures, T. ; Middell, E. ; Milke, N. ; Miller, J. ; Montaruli, T. ; Morse, R. ; Movit, S. M. ; Nahnhauer, R. ; Nam, J. W. ; Naumann, U. ; Nießen, P. ; Nygren, D. R. ; Odrowski, S. ; Olivas, A. ; Olivo, M. ; O'Murchadha, A. ; Ono, M. ; Panknin, S. ; Paul, L. ; Pérez De Los Heros, C. ; Petrovic, J. ; Piegsa, A. ; Pieloth, D. ; Porrata, R. ; Posselt, J. ; Price, C. C. ; Price, P. B. ; Przybylski, G. T. ; Rawlins, K. ; Redl, P. ; Resconi, E. ; Rhode, W. ; Ribordy, M. ; Rizzo, A. ; Rodrigues, J. P. ; Roth, P. ; Rothmaier, F. ; Rott, C. ; Ruhe, T. ; Rutledge, D. ; Ruzybayev, B. ; Ryckbosch, D. ; Sander, H. G. ; Santander, M. ; Sarkar, S. ; Schatto, K. ; Schmidt, T. ; Schönwald, A. ; Schukraft, A. ; Schultes, A. ; Schulz, O. ; Schunck, M. ; Seckel, D. ; Semburg, B. ; Seo, S. H. ; Sestayo, Y. ; Seunarine, S. ; Silvestri, A. ; Slipak, A. ; Spiczak, G. M. ; Spiering, C. ; Stamatikos, M. ; Stanev, T. ; Stephens, G. ; Stezelberger, T. ; Stokstad, R. G. ; Stössl, A. ; Stoyanov, S. ; Strahler, E. A. ; Straszheim, T. ; Stür, M. ; Sullivan, G. W. ; Swillens, Q. ; Taavola, H. ; Taboada, I. ; Tamburro, A. ; Tepe, A. ; Ter-Antonyan, S. ; Tilav, S. ; Toale, P. A. ; Toscano, S. ; Tosi, D. ; Tur.can, D. ; Van Eijndhoven, N. ; Vandenbroucke, J. ; Van Overloop, A. ; Van Santen, J. ; Vehring, M. ; Voge, M. ; Walck, C. ; Waldenmaier, T. ; Wallraff, M. ; Walter, M. ; Weaver, Ch ; Wendt, C. ; Westerhoff, S. ; Whitehorn, N. ; Wiebe, K. ; Wiebusch, C. H. ; Williams, D. R. ; Wischnewski, R. ; Wissing, H. ; Wolf, M. ; Wood, T. R. ; Woschnagg, K. ; Xu, C. ; Xu, X. W. ; Yodh, G. ; Yoshida, S. ; Zarzhitsky, P. ; Zoll, M. / Observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with icecube. In: Astrophysical Journal. 2011 ; Vol. 740, No. 1.
@article{1e92ad5ff4cd4d26b4e4e7e98a15ac9b,
title = "Observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with icecube",
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.",
keywords = "astroparticle physics, cosmic rays",
author = "R. Abbasi and Y. Abdou and T. Abu-Zayyad and J. Adams and Aguilar, {J. A.} and M. Ahlers and D. Altmann and K. Andeen and J. Auffenberg and X. Bai and M. Baker and Barwick, {S. W.} and R. Bay and {Bazo Alba}, {J. L.} and K. Beattie and Beatty, {J. J.} and S. Bechet and Becker, {J. K.} and Becker, {K. H.} and {Lotfi Benabderrhmane}, Mohamed and S. BenZvi and J. Berdermann and P. Berghaus and D. Berley and E. Bernardini and D. Bertrand and Besson, {D. Z.} and D. Bindig and M. Bissok and E. Blaufuss and J. Blumenthal and Boersma, {D. J.} and C. Bohm and D. Bose and S. B{\"o}ser and O. Botner and Brown, {A. M.} and S. Buitink and Caballero-Mora, {K. S.} and M. Carson and D. Chirkin and B. Christy and J. Clem and F. Clevermann and S. Cohen and C. Colnard and Cowen, {D. F.} and D'Agostino, {M. V.} and M. Danninger and J. Daughhetee and Davis, {J. C.} and {De Clercq}, C. and L. Demir{\"o}rs and T. Denger and O. Depaepe and F. Descamps and P. Desiati and {De Vries-Uiterweerd}, G. and T. DeYoung and D{\'i}az-V{\'e}lez, {J. C.} and M. Dierckxsens and J. Dreyer and Dumm, {J. P.} and R. Ehrlich and J. Eisch and Ellsworth, {R. W.} and O. Engdeg{\aa}rd and S. Euler and Evenson, {P. A.} and O. Fadiran and Fazely, {A. R.} and A. Fedynitch and J. Feintzeig and T. Feusels and K. Filimonov and C. Finley and T. Fischer-Wasels and Foerster, {M. M.} and Fox, {B. D.} and A. Franckowiak and R. Franke and Gaisser, {T. K.} and J. Gallagher and L. Gerhardt and L. Gladstone and T. Gl̈usenkamp and A. Goldschmidt and Goodman, {J. A.} and D. Gora and D. Grant and T. Griesel and A. Gro{\ss} and S. Grullon and M. Gurtner and C. Ha and A. Hajismail and A. Hallgren and F. Halzen and K. Han and K. Hanson and D. Heinen and K. Helbing and P. Herquet and S. Hickford and Hill, {G. C.} and Hoffman, {K. D.} and A. Homeier and K. Hoshina and D. Hubert and W. Huelsnitz and H{\"u}l{\ss}, {J. P.} and Hulth, {P. O.} and K. Hultqvist and S. Hussain and A. Ishihara and J. Jacobsen and Japaridze, {G. S.} and H. Johansson and Joseph, {J. M.} and Kampert, {K. H.} and A. Kappes and T. Karg and A. Karle and P. Kenny and J. Kiryluk and F. Kislat and Klein, {S. R.} and K{\"o}hne, {J. H.} and G. Kohnen and H. Kolanoski and L. K{\"o}pke and S. Kopper and Koskinen, {D. J.} and M. Kowalski and T. Kowarik and M. Krasberg and T. Krings and G. Kroll and N. Kurahashi and T. Kuwabara and M. Labare and S. Lafebre and K. Laihem and H. Landsman and Larson, {M. J.} and R. Lauer and J. L̈unemann and B. Madajczyk and J. Madsen and P. Majumdar and A. Marotta and R. Maruyama and K. Mase and Matis, {H. S.} and K. Meagher and M. Merck and P. Ḿesźaros and T. Meures and E. Middell and N. Milke and J. Miller and T. Montaruli and R. Morse and Movit, {S. M.} and R. Nahnhauer and Nam, {J. W.} and U. Naumann and P. Nie{\ss}en and Nygren, {D. R.} and S. Odrowski and A. Olivas and M. Olivo and A. O'Murchadha and M. Ono and S. Panknin and L. Paul and {P{\'e}rez De Los Heros}, C. and J. Petrovic and A. Piegsa and D. Pieloth and R. Porrata and J. Posselt and Price, {C. C.} and Price, {P. B.} and Przybylski, {G. T.} and K. Rawlins and P. Redl and E. Resconi and W. Rhode and M. Ribordy and A. Rizzo and Rodrigues, {J. P.} and P. Roth and F. Rothmaier and C. Rott and T. Ruhe and D. Rutledge and B. Ruzybayev and D. Ryckbosch and Sander, {H. G.} and M. Santander and S. Sarkar and K. Schatto and T. Schmidt and A. Sch{\"o}nwald and A. Schukraft and A. Schultes and O. Schulz and M. Schunck and D. Seckel and B. Semburg and Seo, {S. H.} and Y. Sestayo and S. Seunarine and A. Silvestri and A. Slipak and Spiczak, {G. M.} and C. Spiering and M. Stamatikos and T. Stanev and G. Stephens and T. Stezelberger and Stokstad, {R. G.} and A. St{\"o}ssl and S. Stoyanov and Strahler, {E. A.} and T. Straszheim and M. St{\"u}r and Sullivan, {G. W.} and Q. Swillens and H. Taavola and I. Taboada and A. Tamburro and A. Tepe and S. Ter-Antonyan and S. Tilav and Toale, {P. A.} and S. Toscano and D. Tosi and D. Tur.can and {Van Eijndhoven}, N. and J. Vandenbroucke and {Van Overloop}, A. and {Van Santen}, J. and M. Vehring and M. Voge and C. Walck and T. Waldenmaier and M. Wallraff and M. Walter and Ch Weaver and C. Wendt and S. Westerhoff and N. Whitehorn and K. Wiebe and Wiebusch, {C. H.} and Williams, {D. R.} and R. Wischnewski and H. Wissing and M. Wolf and Wood, {T. R.} and K. Woschnagg and C. Xu and Xu, {X. W.} and G. Yodh and S. Yoshida and P. Zarzhitsky and M. Zoll",
year = "2011",
month = "10",
day = "10",
doi = "10.1088/0004-637X/740/1/16",
language = "English (US)",
volume = "740",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - Observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with icecube

AU - Abbasi, R.

AU - Abdou, Y.

AU - Abu-Zayyad, T.

AU - Adams, J.

AU - Aguilar, J. A.

AU - Ahlers, M.

AU - Altmann, D.

AU - Andeen, K.

AU - Auffenberg, J.

AU - Bai, X.

AU - Baker, M.

AU - Barwick, S. W.

AU - Bay, R.

AU - Bazo Alba, J. L.

AU - Beattie, K.

AU - Beatty, J. J.

AU - Bechet, S.

AU - Becker, J. K.

AU - Becker, K. H.

AU - Lotfi Benabderrhmane, Mohamed

AU - BenZvi, S.

AU - Berdermann, J.

AU - Berghaus, P.

AU - Berley, D.

AU - Bernardini, E.

AU - Bertrand, D.

AU - Besson, D. Z.

AU - Bindig, D.

AU - Bissok, M.

AU - Blaufuss, E.

AU - Blumenthal, J.

AU - Boersma, D. J.

AU - Bohm, C.

AU - Bose, D.

AU - Böser, S.

AU - Botner, O.

AU - Brown, A. M.

AU - Buitink, S.

AU - Caballero-Mora, K. S.

AU - Carson, M.

AU - Chirkin, D.

AU - Christy, B.

AU - Clem, J.

AU - Clevermann, F.

AU - Cohen, S.

AU - Colnard, C.

AU - Cowen, D. F.

AU - D'Agostino, M. V.

AU - Danninger, M.

AU - Daughhetee, J.

AU - Davis, J. C.

AU - De Clercq, C.

AU - Demirörs, L.

AU - Denger, T.

AU - Depaepe, O.

AU - Descamps, F.

AU - Desiati, P.

AU - De Vries-Uiterweerd, G.

AU - DeYoung, T.

AU - Díaz-Vélez, J. C.

AU - Dierckxsens, M.

AU - Dreyer, J.

AU - Dumm, J. P.

AU - Ehrlich, R.

AU - Eisch, J.

AU - Ellsworth, R. W.

AU - Engdegård, O.

AU - Euler, S.

AU - Evenson, P. A.

AU - Fadiran, O.

AU - Fazely, A. R.

AU - Fedynitch, A.

AU - Feintzeig, J.

AU - Feusels, T.

AU - Filimonov, K.

AU - Finley, C.

AU - Fischer-Wasels, T.

AU - Foerster, M. M.

AU - Fox, B. D.

AU - Franckowiak, A.

AU - Franke, R.

AU - Gaisser, T. K.

AU - Gallagher, J.

AU - Gerhardt, L.

AU - Gladstone, L.

AU - Gl̈usenkamp, T.

AU - Goldschmidt, A.

AU - Goodman, J. A.

AU - Gora, D.

AU - Grant, D.

AU - Griesel, T.

AU - Groß, A.

AU - Grullon, S.

AU - Gurtner, M.

AU - Ha, C.

AU - Hajismail, A.

AU - Hallgren, A.

AU - Halzen, F.

AU - Han, K.

AU - Hanson, K.

AU - Heinen, D.

AU - Helbing, K.

AU - Herquet, P.

AU - Hickford, S.

AU - Hill, G. C.

AU - Hoffman, K. D.

AU - Homeier, A.

AU - Hoshina, K.

AU - Hubert, D.

AU - Huelsnitz, W.

AU - Hülß, J. P.

AU - Hulth, P. O.

AU - Hultqvist, K.

AU - Hussain, S.

AU - Ishihara, A.

AU - Jacobsen, J.

AU - Japaridze, G. S.

AU - Johansson, H.

AU - Joseph, J. M.

AU - Kampert, K. H.

AU - Kappes, A.

AU - Karg, T.

AU - Karle, A.

AU - Kenny, P.

AU - Kiryluk, J.

AU - Kislat, F.

AU - Klein, S. R.

AU - Köhne, J. H.

AU - Kohnen, G.

AU - Kolanoski, H.

AU - Köpke, L.

AU - Kopper, S.

AU - Koskinen, D. J.

AU - Kowalski, M.

AU - Kowarik, T.

AU - Krasberg, M.

AU - Krings, T.

AU - Kroll, G.

AU - Kurahashi, N.

AU - Kuwabara, T.

AU - Labare, M.

AU - Lafebre, S.

AU - Laihem, K.

AU - Landsman, H.

AU - Larson, M. J.

AU - Lauer, R.

AU - L̈unemann, J.

AU - Madajczyk, B.

AU - Madsen, J.

AU - Majumdar, P.

AU - Marotta, A.

AU - Maruyama, R.

AU - Mase, K.

AU - Matis, H. S.

AU - Meagher, K.

AU - Merck, M.

AU - Ḿesźaros, P.

AU - Meures, T.

AU - Middell, E.

AU - Milke, N.

AU - Miller, J.

AU - Montaruli, T.

AU - Morse, R.

AU - Movit, S. M.

AU - Nahnhauer, R.

AU - Nam, J. W.

AU - Naumann, U.

AU - Nießen, P.

AU - Nygren, D. R.

AU - Odrowski, S.

AU - Olivas, A.

AU - Olivo, M.

AU - O'Murchadha, A.

AU - Ono, M.

AU - Panknin, S.

AU - Paul, L.

AU - Pérez De Los Heros, C.

AU - Petrovic, J.

AU - Piegsa, A.

AU - Pieloth, D.

AU - Porrata, R.

AU - Posselt, J.

AU - Price, C. C.

AU - Price, P. B.

AU - Przybylski, G. T.

AU - Rawlins, K.

AU - Redl, P.

AU - Resconi, E.

AU - Rhode, W.

AU - Ribordy, M.

AU - Rizzo, A.

AU - Rodrigues, J. P.

AU - Roth, P.

AU - Rothmaier, F.

AU - Rott, C.

AU - Ruhe, T.

AU - Rutledge, D.

AU - Ruzybayev, B.

AU - Ryckbosch, D.

AU - Sander, H. G.

AU - Santander, M.

AU - Sarkar, S.

AU - Schatto, K.

AU - Schmidt, T.

AU - Schönwald, A.

AU - Schukraft, A.

AU - Schultes, A.

AU - Schulz, O.

AU - Schunck, M.

AU - Seckel, D.

AU - Semburg, B.

AU - Seo, S. H.

AU - Sestayo, Y.

AU - Seunarine, S.

AU - Silvestri, A.

AU - Slipak, A.

AU - Spiczak, G. M.

AU - Spiering, C.

AU - Stamatikos, M.

AU - Stanev, T.

AU - Stephens, G.

AU - Stezelberger, T.

AU - Stokstad, R. G.

AU - Stössl, A.

AU - Stoyanov, S.

AU - Strahler, E. A.

AU - Straszheim, T.

AU - Stür, M.

AU - Sullivan, G. W.

AU - Swillens, Q.

AU - Taavola, H.

AU - Taboada, I.

AU - Tamburro, A.

AU - Tepe, A.

AU - Ter-Antonyan, S.

AU - Tilav, S.

AU - Toale, P. A.

AU - Toscano, S.

AU - Tosi, D.

AU - Tur.can, D.

AU - Van Eijndhoven, N.

AU - Vandenbroucke, J.

AU - Van Overloop, A.

AU - Van Santen, J.

AU - Vehring, M.

AU - Voge, M.

AU - Walck, C.

AU - Waldenmaier, T.

AU - Wallraff, M.

AU - Walter, M.

AU - Weaver, Ch

AU - Wendt, C.

AU - Westerhoff, S.

AU - Whitehorn, N.

AU - Wiebe, K.

AU - Wiebusch, C. H.

AU - Williams, D. R.

AU - Wischnewski, R.

AU - Wissing, H.

AU - Wolf, M.

AU - Wood, T. R.

AU - Woschnagg, K.

AU - Xu, C.

AU - Xu, X. W.

AU - Yodh, G.

AU - Yoshida, S.

AU - Zarzhitsky, P.

AU - Zoll, M.

PY - 2011/10/10

Y1 - 2011/10/10

N2 - 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.

AB - 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.

KW - astroparticle physics

KW - cosmic rays

UR - http://www.scopus.com/inward/record.url?scp=80053532674&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=80053532674&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/740/1/16

DO - 10.1088/0004-637X/740/1/16

M3 - Article

AN - SCOPUS:80053532674

VL - 740

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 16

ER -