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      Observation of High-Energy Astrophysical Neutrinos in Three Years of IceCube Data

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          Abstract

          A search for high-energy neutrinos interacting within the IceCube detector between 2010 and 2012 provided the first evidence for a high-energy neutrino flux of extraterrestrial origin. Results from an analysis using the same methods with a third year (2012-2013) of data from the complete IceCube detector are consistent with the previously reported astrophysical flux in the 100 TeV - PeV range at the level of \(10^{-8}\, \mathrm{GeV}\, \mathrm{cm}^{-2}\, \mathrm{s}^{-1}\, \mathrm{sr}^{-1}\) per flavor and reject a purely atmospheric explanation for the combined 3-year data at \(5.7 \sigma\). The data are consistent with expectations for equal fluxes of all three neutrino flavors and with isotropic arrival directions, suggesting either numerous or spatially extended sources. The three-year dataset, with a livetime of 988 days, contains a total of 37 neutrino candidate events with deposited energies ranging from 30 to 2000 TeV. The 2000 TeV event is the highest-energy neutrino interaction ever observed.

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          Author and article information

          Journal
          2014-05-21
          2014-07-02
          Article
          10.1103/PhysRevLett.113.101101
          1405.5303
          332ff6ee-a983-4e2d-823e-788e0646cf1a

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
          Custom metadata
          Phys. Rev. Lett. 113, 101101 (2014)
          8 pages, 5 figures. Accepted by PRL. The event catalog, event displays, and other data tables are included after the final page of the article. Changed from the initial submission to reflect referee comments, expanding the section on atmospheric backgrounds, and fixes offsets of up to 0.9 seconds in reported event times. Address correspondence to: J. Feintzeig, C. Kopper, N. Whitehorn
          astro-ph.HE astro-ph.CO hep-ex

          Cosmology & Extragalactic astrophysics,High energy & Particle physics,High energy astrophysical phenomena

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