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1.	Aartsen, M. G., et al. (author) Search for steady point-like sources in the astrophysical muon neutrino flux with 8 years of IceCube data 2019 In: European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 79:3 Journal article (peer-reviewed)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 approximate to 1 degrees at 1 TeV and improves to approximate to 0.3 degrees 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 approximate to 35% assuming an E-2 spectrum. The sensitivity on the muon-neutrino flux is at a level of E2dN/dE=310-13s-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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Type of publication: journal article (1)

Type of content: peer-reviewed (1)

Author/Editor: Bohm, Christian (1); Chen, C. (1); Kolanoski, H. (1); Moore, R. W. (1); Nagai, R. (1); Koepke, L. (1); show more...; Boeser, S. (1); Bai, X. (1); Rauch, L. (1); Terliuk, A. (1); Kim, J. (1); Kowalski, M. (1); Song, M. (1); Van Eijndhoven, N. (1); Aartsen, M. G. (1); Ackermann, M. (1); Adams, J. (1); Aguilar, J. A. (1); Ahrens, Maryon (1); Ahrens, M. (1); Altmann, D. (1); Anderson, T. (1); Arguelles, C. (1); Auffenberg, J. (1); Barwick, S. W. (1); Baum, V. (1); Bay, R. (1); Beatty, J. J. (1); Tjus, J. Becker (1); Hultqvist, Klas (1); BenZvi, S. (1); Berley, D. (1); Bernardini, E. (1); Besson, D. Z. (1); Binder, G. (1); Bindig, D. (1); Blaufuss, E. (1); Boerner, M. (1); Bos, F. (1); Botner, Olga (1); Braun, J. (1); Bretz, H. -P (1); Cheung, E. (1); Chirkin, D. (1); Clark, K. (1); Classen, L. (1); Cowen, D. F. (1); Day, M. (1); de Andre, J. P. A. M ... (1); De Clercq, C. (1); show less...

University: Uppsala University (1); Stockholm University (1)

Language: English (1)

Research subject (UKÄ/SCB): Natural sciences (1)

Year: 2019 (1)

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