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Type: Journal article
Title: Search for steady point-like sources in the astrophysical muon neutrino flux with 8 years of IceCube data
Author: Aartsen, M.G.
Ackermann, M.
Adams, J.
Aguilar, J.A.
Ahlers, M.
Ahrens, M.
Altmann, D.
Andeen, K.
Anderson, T.
Ansseau, I.
Anton, G.
Argüelles, C.
Auffenberg, J.
Axani, S.
Backes, P.
Bagherpour, H.
Bai, X.
Barbano, A.
Barron, J.P.
Barwick, S.W.
et al.
Citation: European Physical Journal C, 2019; 79(3):234-1-234-19
Publisher: Springer Nature
Issue Date: 2019
ISSN: 1434-6044
Statement of
M.G. Aartsen … G.C. Hill … A. Kyriacou … A. Wallace … B.J. Whelan … [et al.]
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.
Rights: © The Author(s) 2019
RMID: 0030112061
DOI: 10.1140/epjc/s10052-019-6680-0
Appears in Collections:Physics publications

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