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 20TeV. With a data set of this size, it is possible to probe the southern sky for per-mil anisotropy on all angular scales...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/118354 2023-05-15T18:22:55+02:00 Observation of Anisotropy in the Arrival Directions of Galactic Cosmic Rays at Multiple Angular Scales with IceCube Aguilar Sanchez, Juan Antonio Bechet, Sabrina Bertrand, Daniel Dierckxsens, Mark Hanson, Kael Meures, Thomas Petrovic, Jéléna Toscano, Simona 2011 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/118354 https://dipot.ulb.ac.be/dspace/bitstream/2013/118354/3/doi_99196.pdf en eng uri/info:doi/10.1088/0004-637X/740/1/16 uri/info:scp/80053532674 https://dipot.ulb.ac.be/dspace/bitstream/2013/118354/3/doi_99196.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/118354 1 full-text file(s): info:eu-repo/semantics/restrictedAccess The Astrophysical journal, 740 Physique des particules élémentaires astroparticle physics cosmic rays info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2011 ftunivbruxelles 2022-06-12T21:20:30Z 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. © 2011. The American Astronomical Society. All rights reserved. 0 SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper South pole DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) South Pole |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Physique des particules élémentaires astroparticle physics cosmic rays |
spellingShingle |
Physique des particules élémentaires astroparticle physics cosmic rays Aguilar Sanchez, Juan Antonio Bechet, Sabrina Bertrand, Daniel Dierckxsens, Mark Hanson, Kael Meures, Thomas Petrovic, Jéléna Toscano, Simona Observation of Anisotropy in the Arrival Directions of Galactic Cosmic Rays at Multiple Angular Scales with IceCube |
topic_facet |
Physique des particules élémentaires astroparticle physics cosmic rays |
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 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. © 2011. The American Astronomical Society. All rights reserved. 0 SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Aguilar Sanchez, Juan Antonio Bechet, Sabrina Bertrand, Daniel Dierckxsens, Mark Hanson, Kael Meures, Thomas Petrovic, Jéléna Toscano, Simona |
author_facet |
Aguilar Sanchez, Juan Antonio Bechet, Sabrina Bertrand, Daniel Dierckxsens, Mark Hanson, Kael Meures, Thomas Petrovic, Jéléna Toscano, Simona |
author_sort |
Aguilar Sanchez, Juan Antonio |
title |
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_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_sort |
observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with icecube |
publishDate |
2011 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/118354 https://dipot.ulb.ac.be/dspace/bitstream/2013/118354/3/doi_99196.pdf |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
The Astrophysical journal, 740 |
op_relation |
uri/info:doi/10.1088/0004-637X/740/1/16 uri/info:scp/80053532674 https://dipot.ulb.ac.be/dspace/bitstream/2013/118354/3/doi_99196.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/118354 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/restrictedAccess |
_version_ |
1766202331229061120 |