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

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 20 TeV. With a data set of this size, it is possible to probe the southern sky for per-mil anisotropy on all angular scale...

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Main Authors:	Abbasi, R., Abdou, Y., Abu-Zayyad, T., Adams, J., Aguilar, J., Ahlers, M., Altmann, D., Andeen, K., Auffenberg, J., Bai, X., Baker, M., Barwick, S., Bay, R., Bazo Alba, J., Beattie, K., Beatty, J., Bechet, S., Becker, J., Becker, K., Benabderrahmane, M., BenZvi, S., Berdermann, J., Berghaus, P., Berley, D., Bernardini, E., Bertrand, D., Besson, D., Bindig, D., Bissok, M., Blaufuss, E., Blumenthal, J., Boersma, D., Bohm, C., Bose, D., Böser, S., Botner, O., Brown, A., Buitink, S., Caballero-Mora, K., Carson, Michael, Chirkin, D., Christy, B., Clem, J., Clevermann, F., Cohen, S., Colnard, C., Cowen, D., D'Agostino, M., Danninger, M., Daughhetee, J., Davis, J., De Clercq, C., Demirörs, L., Denger, T., Depaepe, O., Descamps, F., Desiati, P., De Vries-Uiterweerd, G., DeYoung, T., Díaz-Vélez, J., Dierckxsens, M., Dreyer, J., Dumm, J., Ehrlich, R., Eisch, J., Ellsworth, R., Engdegård, O., Euler, S., Evenson, P., Fadiran, O., Fazely, A., Fedynitch, A., Feintzeig, J., Feusels, T., Filimonov, K., Finley, C., Fischer-Wasels, T., Foerster, M., Fox, B., Franckowiak, A., Franke, R., Gaisser, T., Gallagher, J., Gerhardt, L., Gladstone, L., Gl¨usenkamp, T., Goldschmidt, A., Goodman, J., Gora, D., Grant, D., Griesel, T., Groß, A., Grullon, S., Gurtner, M., Ha, C., Hajismail, A.
Format:	Journal Article
Published:	2011
Online Access:	http://hdl.handle.net/20.500.11937/29425

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author	Abbasi, R. Abdou, Y. Abu-Zayyad, T. Adams, J. Aguilar, J. Ahlers, M. Altmann, D. Andeen, K. Auffenberg, J. Bai, X. Baker, M. Barwick, S. Bay, R. Bazo Alba, J. Beattie, K. Beatty, J. Bechet, S. Becker, J. Becker, K. Benabderrahmane, M. BenZvi, S. Berdermann, J. Berghaus, P. Berley, D. Bernardini, E. Bertrand, D. Besson, D. Bindig, D. Bissok, M. Blaufuss, E. Blumenthal, J. Boersma, D. Bohm, C. Bose, D. Böser, S. Botner, O. Brown, A. Buitink, S. Caballero-Mora, K. Carson, Michael Chirkin, D. Christy, B. Clem, J. Clevermann, F. Cohen, S. Colnard, C. Cowen, D. D'Agostino, M. Danninger, M. Daughhetee, J. Davis, J. De Clercq, C. Demirörs, L. Denger, T. Depaepe, O. Descamps, F. Desiati, P. De Vries-Uiterweerd, G. DeYoung, T. Díaz-Vélez, J. Dierckxsens, M. Dreyer, J. Dumm, J. Ehrlich, R. Eisch, J. Ellsworth, R. Engdegård, O. Euler, S. Evenson, P. Fadiran, O. Fazely, A. Fedynitch, A. Feintzeig, J. Feusels, T. Filimonov, K. Finley, C. Fischer-Wasels, T. Foerster, M. Fox, B. Franckowiak, A. Franke, R. Gaisser, T. Gallagher, J. Gerhardt, L. Gladstone, L. Gl¨usenkamp, T. Goldschmidt, A. Goodman, J. Gora, D. Grant, D. Griesel, T. Groß, A. Grullon, S. Gurtner, M. Ha, C. Hajismail, A.
author_facet	Abbasi, R. Abdou, Y. Abu-Zayyad, T. Adams, J. Aguilar, J. Ahlers, M. Altmann, D. Andeen, K. Auffenberg, J. Bai, X. Baker, M. Barwick, S. Bay, R. Bazo Alba, J. Beattie, K. Beatty, J. Bechet, S. Becker, J. Becker, K. Benabderrahmane, M. BenZvi, S. Berdermann, J. Berghaus, P. Berley, D. Bernardini, E. Bertrand, D. Besson, D. Bindig, D. Bissok, M. Blaufuss, E. Blumenthal, J. Boersma, D. Bohm, C. Bose, D. Böser, S. Botner, O. Brown, A. Buitink, S. Caballero-Mora, K. Carson, Michael Chirkin, D. Christy, B. Clem, J. Clevermann, F. Cohen, S. Colnard, C. Cowen, D. D'Agostino, M. Danninger, M. Daughhetee, J. Davis, J. De Clercq, C. Demirörs, L. Denger, T. Depaepe, O. Descamps, F. Desiati, P. De Vries-Uiterweerd, G. DeYoung, T. Díaz-Vélez, J. Dierckxsens, M. Dreyer, J. Dumm, J. Ehrlich, R. Eisch, J. Ellsworth, R. Engdegård, O. Euler, S. Evenson, P. Fadiran, O. Fazely, A. Fedynitch, A. Feintzeig, J. Feusels, T. Filimonov, K. Finley, C. Fischer-Wasels, T. Foerster, M. Fox, B. Franckowiak, A. Franke, R. Gaisser, T. Gallagher, J. Gerhardt, L. Gladstone, L. Gl¨usenkamp, T. Goldschmidt, A. Goodman, J. Gora, D. Grant, D. Griesel, T. Groß, A. Grullon, S. Gurtner, M. Ha, C. Hajismail, A.
author_sort	Abbasi, R.
building	Curtin Institutional Repository
collection	Online Access
description	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 20 TeV. 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 = 122fdg4 and declination δ = –47fdg4), 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.
first_indexed	2025-11-14T08:14:22Z
format	Journal Article
id	curtin-20.500.11937-29425
institution	Curtin University Malaysia
institution_category	Local University
last_indexed	2025-11-14T08:14:22Z
publishDate	2011
recordtype	eprints
repository_type	Digital Repository
spelling	curtin-20.500.11937-294252023-02-22T06:24:17Z 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. Ahlers, M. Altmann, D. Andeen, K. Auffenberg, J. Bai, X. Baker, M. Barwick, S. Bay, R. Bazo Alba, J. Beattie, K. Beatty, J. Bechet, S. Becker, J. Becker, K. Benabderrahmane, M. BenZvi, S. Berdermann, J. Berghaus, P. Berley, D. Bernardini, E. Bertrand, D. Besson, D. Bindig, D. Bissok, M. Blaufuss, E. Blumenthal, J. Boersma, D. Bohm, C. Bose, D. Böser, S. Botner, O. Brown, A. Buitink, S. Caballero-Mora, K. Carson, Michael Chirkin, D. Christy, B. Clem, J. Clevermann, F. Cohen, S. Colnard, C. Cowen, D. D'Agostino, M. Danninger, M. Daughhetee, J. Davis, J. De Clercq, C. Demirörs, L. Denger, T. Depaepe, O. Descamps, F. Desiati, P. De Vries-Uiterweerd, G. DeYoung, T. Díaz-Vélez, J. Dierckxsens, M. Dreyer, J. Dumm, J. Ehrlich, R. Eisch, J. Ellsworth, R. Engdegård, O. Euler, S. Evenson, P. Fadiran, O. Fazely, A. Fedynitch, A. Feintzeig, J. Feusels, T. Filimonov, K. Finley, C. Fischer-Wasels, T. Foerster, M. Fox, B. Franckowiak, A. Franke, R. Gaisser, T. Gallagher, J. Gerhardt, L. Gladstone, L. Gl¨usenkamp, T. Goldschmidt, A. Goodman, J. Gora, D. Grant, D. Griesel, T. Groß, A. Grullon, S. Gurtner, M. Ha, C. Hajismail, A. 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 20 TeV. 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 = 122fdg4 and declination δ = –47fdg4), 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. 2011 Journal Article http://hdl.handle.net/20.500.11937/29425 10.1088/0004-637X/740/1/16 unknown
spellingShingle	Abbasi, R. Abdou, Y. Abu-Zayyad, T. Adams, J. Aguilar, J. Ahlers, M. Altmann, D. Andeen, K. Auffenberg, J. Bai, X. Baker, M. Barwick, S. Bay, R. Bazo Alba, J. Beattie, K. Beatty, J. Bechet, S. Becker, J. Becker, K. Benabderrahmane, M. BenZvi, S. Berdermann, J. Berghaus, P. Berley, D. Bernardini, E. Bertrand, D. Besson, D. Bindig, D. Bissok, M. Blaufuss, E. Blumenthal, J. Boersma, D. Bohm, C. Bose, D. Böser, S. Botner, O. Brown, A. Buitink, S. Caballero-Mora, K. Carson, Michael Chirkin, D. Christy, B. Clem, J. Clevermann, F. Cohen, S. Colnard, C. Cowen, D. D'Agostino, M. Danninger, M. Daughhetee, J. Davis, J. De Clercq, C. Demirörs, L. Denger, T. Depaepe, O. Descamps, F. Desiati, P. De Vries-Uiterweerd, G. DeYoung, T. Díaz-Vélez, J. Dierckxsens, M. Dreyer, J. Dumm, J. Ehrlich, R. Eisch, J. Ellsworth, R. Engdegård, O. Euler, S. Evenson, P. Fadiran, O. Fazely, A. Fedynitch, A. Feintzeig, J. Feusels, T. Filimonov, K. Finley, C. Fischer-Wasels, T. Foerster, M. Fox, B. Franckowiak, A. Franke, R. Gaisser, T. Gallagher, J. Gerhardt, L. Gladstone, L. Gl¨usenkamp, T. Goldschmidt, A. Goodman, J. Gora, D. Grant, D. Griesel, T. Groß, A. Grullon, S. Gurtner, M. Ha, C. Hajismail, A. Observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with icecube
title	Observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with icecube
title_full	Observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with icecube
title_fullStr	Observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with icecube
title_full_unstemmed	Observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with icecube
title_short	Observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with icecube
title_sort	observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with icecube
url	http://hdl.handle.net/20.500.11937/29425

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

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