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Observation of anisotropy in the galactic cosmic-ray arrival directions at 400 TeV with IceCube
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2012 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 746, no 1, 33- p.Article in journal (Refereed) Published
Abstract [en]

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 x 10(9) muon events with a median angular resolution of similar to 3 degrees. 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 -6.3 sigma. 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.

Place, publisher, year, edition, pages
2012. Vol. 746, no 1, 33- p.
Keyword [en]
astroparticle physics, cosmic rays, neutrinos
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-174790DOI: 10.1088/0004-637X/746/1/33ISI: 000302861300033OAI: oai:DiVA.org:uu-174790DiVA: diva2:529144
Available from: 2012-05-29 Created: 2012-05-28 Last updated: 2015-06-24Bibliographically approved

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Botner, OlgaEngdegård, OlleHallgren, AllanPérez de los Heros, CarlosStröm, RickardTaavola, Henric
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