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Andeen, K.; Bagherpour, H.; Barbano, A.; Barron, J. P.; Beatty, J. J.; Binder, G.; Bourbeau, E.; Bretz, H.-P.; Collin, G. H.; Conrad, J. M.; Coppin, P.; Cowen, D. F.; Day, M.; De Clercq, C.; Deoskar, K.; De Ridder, S.; DeYoung, T.; Dunkman, M.; Eichmann, B.; Fahey, S.; Fazely, A. R.; Felde, J.; Gaisser, T. K.; Ganster, E.; Glauch, T.; Gonzalez, J. G.; Grant, D.; Hallgren, A.; Halve, L.; Hanson, K.; Hokanson-Fasig, B.; Huang, F.; Iovine, N.; Ishihara, A.; Kang, W.; Kappesser, D.; Kelley, J. L.; Kheirandish, A.; Kolanoski, H.; Kopper, S.; Krings, K.; Krückl, G.; Kunwar, S.; Kurahashi, N.; Labare, M.; Lanfranchi, J. L.; Larson, M. J.; Lauber, F.; Lohfink, E.; Lu, L.; Mahn, K. B. M.; Makino, Y.; Mariş, I. C.; Mase, K.; Merino, G.; Miarecki, S.; Montaruli, T.; Naumann, U.; Neer, G.; Nowicki, S. C.; Nygren, D. R.; Pandya, H.; Pankova, D. V.; Peiffer, P.; Pérez de los Heros, C.; Pinat, E.; Pizzuto, A.; Raab, C.; Rauch, L.; Rea, I. C.; Reimann, R.; Robertson, S.; Rysewyk, D.; Sanchez Herrera, S. E.; Schmidt, T.; Schneider, A.; Schöneberg, S.; Soedingrekso, J.; Song, M.; Stanev, T.; Stokstad, R. G.; Stößl, A.; Stuttard, T.; Sutherland, M.; Toscano, S.; Tselengidou, M.; Turley, C. F.; van Eijk, D.; van Eijndhoven, N.; van Santen, J.; Walck, C.; Weiss, M. J.; Wendt, C.; Werthebach, J.; Whitehorn, N.; Wiebe, K.; Wood, T. R.; Woolsey, E.; Xu, D. L.; Yodh, G.
The European physical journal. C, Particles and fields, 03/2019, Letnik: 79, Številka: 3Journal Article
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 E 2 d N / d E = 3 · 10 - 13 TeV cm - 2 s - 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.
