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https://hdl.handle.net/2440/101963
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Type: | Journal article |
Title: | Observation of anisotropy in the galactic cosmic-ray arrival directions at 400 TeV with IceCube |
Author: | Abbasi, R. Abdou, Y. Abu-Zayyad, T. Ackermann, M. Adams, J. Aguilar, J.A. Ahlers, M. Allen, M.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. et al. |
Citation: | The Astrophysical Journal: an international review of astronomy and astronomical physics, 2012; 746(1):1-11 |
Publisher: | IOP Publishing Ltd |
Issue Date: | 2012 |
ISSN: | 0004-637X 1538-4357 |
Statement of Responsibility: | 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. |
DOI: | 10.1088/0004-637X/746/1/33 |
Published version: | http://dx.doi.org/10.1088/0004-637x/746/1/33 |
Appears in Collections: | Aurora harvest 3 Physics publications |
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