Evidence for Astrophysical Muon Neutrinos from the Northern Sky with IceCube

M.G. Aartsen; Abraham Kalikstein; M. Ackermann; J. Adams; J.A. Aguilar; M. Ahlers; M. Ahrens; D. Altmann; T. Anderson; M. Archinger; David Jason Koskinen; Michael James Larson; Michael Marc Wolf; Morten Ankersen Medici; Subir Sarkar; J. Sandroos

doi:10.1103/physrevlett.115.081102

Evidence for Astrophysical Muon Neutrinos from the Northern Sky with IceCube

M.G. Aartsen, Abraham Kalikstein, M. Ackermann, J. Adams, J.A. Aguilar, M. Ahlers, M. Ahrens, D. Altmann, T. Anderson, M. Archinger, David Jason Koskinen, Michael James Larson, Michael Marc Wolf, Morten Ankersen Medici, Subir Sarkar, J. Sandroos

226 Citationer (Scopus)

Abstract

Results from the IceCube Neutrino Observatory have recently provided compelling evidence for the existence of a high energy astrophysical neutrino flux utilizing a dominantly Southern Hemisphere data set consisting primarily of νe and ντ charged-current and neutral-current (cascade) neutrino interactions. In the analysis presented here, a data sample of approximately 35000 muon neutrinos from the Northern sky is extracted from data taken during 659.5 days of live time recorded between May 2010 and May 2012. While this sample is composed primarily of neutrinos produced by cosmic ray interactions in Earth's atmosphere, the highest energy events are inconsistent with a hypothesis of solely terrestrial origin at 3.7σ significance. These neutrinos can, however, be explained by an astrophysical flux per neutrino flavor at a level of Φ(Eν)=9.9-3.4+3.9×10-19GeV-1cm-2sr-1s-1(Eν/100TeV)-2, consistent with IceCube's Southern-Hemisphere-dominated result. Additionally, a fit for an astrophysical flux with an arbitrary spectral index is performed. We find a spectral index of 2.2-0.2+0.2, which is also in good agreement with the Southern Hemisphere result.

Originalsprog	Engelsk
Artikelnummer	081102
Tidsskrift	Physical Review Letters
Vol/bind	115
Udgave nummer	8
ISSN	0031-9007
DOI	https://doi.org/10.1103/physrevlett.115.081102
Status	Udgivet - 20 aug. 2015

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10.1103/physrevlett.115.081102

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Aartsen, M. G., Kalikstein, A., Ackermann, M., Adams, J., Aguilar, J. A., Ahlers, M., Ahrens, M., Altmann, D., Anderson, T., Archinger, M., Koskinen, D. J., Larson, M. J., Wolf, M. M., Medici, M. A., Sarkar, S., & Sandroos, J. (2015). Evidence for Astrophysical Muon Neutrinos from the Northern Sky with IceCube. Physical Review Letters, 115(8), [081102]. https://doi.org/10.1103/physrevlett.115.081102

Aartsen, MG, Kalikstein, A, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Altmann, D, Anderson, T, Archinger, M, Koskinen, DJ, Larson, MJ, Wolf, MM, Medici, MA, Sarkar, S & Sandroos, J 2015, 'Evidence for Astrophysical Muon Neutrinos from the Northern Sky with IceCube', Physical Review Letters, bind 115, nr. 8, 081102. https://doi.org/10.1103/physrevlett.115.081102

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abstract = "Results from the IceCube Neutrino Observatory have recently provided compelling evidence for the existence of a high energy astrophysical neutrino flux utilizing a dominantly Southern Hemisphere data set consisting primarily of νe and ντ charged-current and neutral-current (cascade) neutrino interactions. In the analysis presented here, a data sample of approximately 35000 muon neutrinos from the Northern sky is extracted from data taken during 659.5 days of live time recorded between May 2010 and May 2012. While this sample is composed primarily of neutrinos produced by cosmic ray interactions in Earth's atmosphere, the highest energy events are inconsistent with a hypothesis of solely terrestrial origin at 3.7σ significance. These neutrinos can, however, be explained by an astrophysical flux per neutrino flavor at a level of Φ(Eν)=9.9-3.4+3.9×10-19GeV-1cm-2sr-1s-1(Eν/100TeV)-2, consistent with IceCube's Southern-Hemisphere-dominated result. Additionally, a fit for an astrophysical flux with an arbitrary spectral index is performed. We find a spectral index of 2.2-0.2+0.2, which is also in good agreement with the Southern Hemisphere result.",

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AU - Aartsen, M.G.

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AU - Aguilar, J.A.

AU - Ahlers, M.

AU - Ahrens, M.

AU - Altmann, D.

AU - Anderson, T.

AU - Archinger, M.

AU - Koskinen, David Jason

AU - Larson, Michael James

AU - Wolf, Michael Marc

AU - Medici, Morten Ankersen

AU - Sarkar, Subir

AU - Sandroos, J.

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AB - Results from the IceCube Neutrino Observatory have recently provided compelling evidence for the existence of a high energy astrophysical neutrino flux utilizing a dominantly Southern Hemisphere data set consisting primarily of νe and ντ charged-current and neutral-current (cascade) neutrino interactions. In the analysis presented here, a data sample of approximately 35000 muon neutrinos from the Northern sky is extracted from data taken during 659.5 days of live time recorded between May 2010 and May 2012. While this sample is composed primarily of neutrinos produced by cosmic ray interactions in Earth's atmosphere, the highest energy events are inconsistent with a hypothesis of solely terrestrial origin at 3.7σ significance. These neutrinos can, however, be explained by an astrophysical flux per neutrino flavor at a level of Φ(Eν)=9.9-3.4+3.9×10-19GeV-1cm-2sr-1s-1(Eν/100TeV)-2, consistent with IceCube's Southern-Hemisphere-dominated result. Additionally, a fit for an astrophysical flux with an arbitrary spectral index is performed. We find a spectral index of 2.2-0.2+0.2, which is also in good agreement with the Southern Hemisphere result.

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Evidence for Astrophysical Muon Neutrinos from the Northern Sky with IceCube

Abstract

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