par Aguilar Sanchez, Juan Antonio 
;Hanson, Kael ;Bertrand, Daniel ;O'Murchadha, Aongus ;Bechet, Sabrina ;Heereman von Zuydtwyck, David ;Verhagen, Erik ;Meures, Thomas ;Toscano, Simona ; [et al.]
Référence The Astrophysical journal, 746, 1, page (33)
Publication Publié, 2012
;Hanson, Kael ;Bertrand, Daniel ;O'Murchadha, Aongus ;Bechet, Sabrina ;Heereman von Zuydtwyck, David ;Verhagen, Erik ;Meures, Thomas ;Toscano, Simona ; [et al.]Référence The Astrophysical journal, 746, 1, page (33)
Publication Publié, 2012
Article révisé par les pairs
| Résumé : | In this paper we report the first observation in the Southern hemisphere of an energy dependence in the Galactic cosmic-ray anisotropy up to a few hundredTeV. This measurement was performed using cosmic-ray-induced muons recorded by the partially deployed IceCube observatory between 2009 May and 2010 May. The data include a total of 33 × 109 muon events with a median angular resolution of 3°. A sky map of the relative intensity in arrival direction over the Southern celestial sky is presented for cosmic-ray median energies of 20 and 400TeV. The same large-scale anisotropy observed at median energies around 20TeV is not present at 400TeV. Instead, the high-energy sky map shows a different anisotropy structure including a deficit with a post-trial significance of -6.3σ. This anisotropy reveals a new feature of the Galactic cosmic-ray distribution, which must be incorporated into theories of the origin and propagation of cosmic rays. © 2012. The American Astronomical Society. All rights reserved. |
