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Search for steady point-like sources in the astrophysical muon neutrino flux with 8 years of IceCube data

CollaborationWith : Barbano, Anastasia / Bron, Stéphanie / Carver, Tessa / Montaruli, Teresa
Published in The European Physical Journal. C, Particles and Fields. 2019, vol. 79, no. 3, p. 234
Collection Open Access - SCOAP3
Abstract The IceCube Collaboration has observed a high-energy astrophysical neutrino flux and recently found evidence for neutrino emission from the blazar TXS 0506 + 056. These results open a new window into the high-energy universe. However, the source or sources of most of the observed flux of astrophysical neutrinos remains uncertain. Here, a search for steady point-like neutrino sources is performed using an unbinned likelihood analysis. The method searches for a spatial accumulation of muon-neutrino events using the very high-statistics sample of about 497,000 neutrinos recorded by IceCube between 2009 and 2017. The median angular resolution is ∼1∘ at 1 TeV and improves to ∼0.3∘ for neutrinos with an energy of 1 PeV. Compared to previous analyses, this search is optimized for point-like neutrino emission with the same flux-characteristics as the observed astrophysical muon-neutrino flux and introduces an improved event-reconstruction and parametrization of the background. The result is an improvement in sensitivity to the muon-neutrino flux compared to the previous analysis of ∼35% assuming an E-2 spectrum. The sensitivity on the muon-neutrino flux is at a level of E2dN/dE=3·10-13TeVcm-2s-1 . No new evidence for neutrino sources is found in a full sky scan and in an a priori candidate source list that is motivated by gamma-ray observations. Furthermore, no significant excesses above background are found from populations of sub-threshold sources. The implications of the non-observation for potential source classes are discussed.
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ICECUBE COLLABORATION. Search for steady point-like sources in the astrophysical muon neutrino flux with 8 years of IceCube data. In: The European Physical Journal. C, Particles and Fields, 2019, vol. 79, n° 3, p. 234. doi: 10.1140/epjc/s10052-019-6680-0 https://archive-ouverte.unige.ch/unige:115525

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Deposited on : 2019-04-01

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