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|Title:||Observation of anisotropy in the galactic cosmic-ray arrival directions at 400 TeV with IceCube|
Bazo Alba, J.L.
|Citation:||The Astrophysical Journal: an international review of astronomy and astronomical physics, 2012; 746(1):1-11|
|Publisher:||IOP Publishing Ltd|
|R. Abbasi ... G.C. Hill, et al., IceCube Collaboration|
|Abstract:||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 hundred TeV. 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 400 TeV. The same large-scale anisotropy observed at median energies around 20 TeV is not present at 400 TeV. 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.|
|Keywords:||astroparticle physics; cosmic rays; neutrinos|
|Rights:||© 2012. The American Astronomical Society. All rights reserved. Printed in the U.S.A.|
|Appears in Collections:||Aurora harvest 3|
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