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Evidence for astrophysical muon neutrinos from the Northern Sky with IceCube

Author
Organization
Project
IceCube
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 nu(e) and nu(tau) charged-current and neutral-current ( cascade) neutrino interactions. In the analysis presented here, a data sample of approximately 35 000 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 3.7 sigma significance. These neutrinos can, however, be explained by an astrophysical flux per neutrino flavor at a level of Phi(E-nu) = 9.9(-3.4)(+3.9) x 10(-19) GeV-1 cm(-2) sr(-1) s(-1) (E-nu/100 TeV)(-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.
Keywords
GAMMA-RAY BURSTS, HIGH-ENERGY NEUTRINOS, ATMOSPHERIC MUON, SPECTRUM, FLUXES, RATIO

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Citation

Please use this url to cite or link to this publication:

Chicago
Aartsen, MG, K Abraham, M Ackermann, J Adams, JA Aguilar, M Ahlers, M Ahrens, et al. 2015. “Evidence for Astrophysical Muon Neutrinos from the Northern Sky with IceCube.” Physical Review Letters 115 (8).
APA
Aartsen, M., Abraham, K., Ackermann, M., Adams, J., Aguilar, J., Ahlers, M., Ahrens, M., et al. (2015). Evidence for astrophysical muon neutrinos from the Northern Sky with IceCube. PHYSICAL REVIEW LETTERS, 115(8).
Vancouver
1.
Aartsen M, Abraham K, Ackermann M, Adams J, Aguilar J, Ahlers M, et al. Evidence for astrophysical muon neutrinos from the Northern Sky with IceCube. PHYSICAL REVIEW LETTERS. 2015;115(8).
MLA
Aartsen, MG, K Abraham, M Ackermann, et al. “Evidence for Astrophysical Muon Neutrinos from the Northern Sky with IceCube.” PHYSICAL REVIEW LETTERS 115.8 (2015): n. pag. Print.
@article{7132887,
  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 nu(e) and nu(tau) charged-current and neutral-current ( cascade) neutrino interactions. In the analysis presented here, a data sample of approximately 35 000 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 3.7 sigma significance. These neutrinos can, however, be explained by an astrophysical flux per neutrino flavor at a level of Phi(E-nu) = 9.9(-3.4)(+3.9) x 10(-19) GeV-1 cm(-2) sr(-1) s(-1) (E-nu/100 TeV)(-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.},
  articleno    = {081102},
  author       = {Aartsen, MG and Abraham, K and Ackermann, M and Adams, J and Aguilar, JA and Ahlers, M and Ahrens, M and Altmann, D and Anderson, T and Archinger, M and Arguelles, C and Arlen, TC and Auffenberg, J and Bai, X and Barwick, SW and Baum, V and Bay, R and Beatty, JJ and Becker Tjus, J and Becker, K-H and Beiser, E and BenZvi, S and Berghaus, P and Berley, D and Bernardini, E and Bernhard, A and Besson, DZ and Binder, G and Bindig, D and Bissok, M and Blaufuss, E and Blumenthal, J and Boersma, DJ and Bohm, C and Boerner, M and Bos, F and Bose, D and Boeser, S and Botner, O and Braun, J and Brayeur, L and Bretz, H-P and Brown, AM and Buzinsky, N and Casey, J and Casier, M and Cheung, E and Chirkin, D and Christov, A and Christy, B and Clark, K and Classen, L and Coenders, S and Cowen, DF and Cruz Silva, AH and Daughhetee, J and Davis, JC and Day, M and de Andre, JPAM and De Clercq, C and Dembinski, H and De Ridder, Sam and Desiati, P and de Vries, KD and de Wasseige, G and de With, M and deYoung, T and Diaz-Velez, JC and Dumm, JP and Dunkman, M and Eagan, R and Eberhardt, B and Ehrhardt, T and Eichmann, B and Euler, S and Evenson, PA and Fadiran, O and Fahey, S and Fazely, AR and Fedynitch, A and Feintzeig, J and Felde, J and Filimonov, K and Finley, C and Fischer-Wasels, T and Flis, S and Fuchs, T and Glagla, M and Gaisser, TK and Gaior, R and Gallagher, J and Gerhardt, L and Ghorbani, K and Gier, D and Gladstone, L and Gluesenkamp, T and Goldschmidt, A and Golup, G and Gonzalez, JG and Goodman, JA and Gora, D and Grant, D and Gretskov, P and Groh, JC and Gross, A and Ha, C and Haack, C and Haj Ismail, Abd Al Karim and Hallgren, A and Halzen, F and Hansmann, B and Hanson, K and Hebecker, D and Heereman, D and Helbing, K and Hellauer, R and Hellwig, D and Hickford, S and Hignight, J and Hill, GC and Hoffman, KD and Hoffmann, R and Holzapfe, K and Homeier, A and Hoshina, K and Huang, F and Huber, M and Huelsnitz, W and Hulth, PO and Hultqvist, K and In, S and Ishihara, A and Jacobi, E and Japaridze, GS and Jero, K and Jurkovic, M and Kaminsky, B and Kappes, A and Karg, T and Karle, A and Kauer, M and Keivani, A and Kelley, JL and Kemp, J and Kheirandish, A and Kiryluk, J and Klaes, J and Klein, SR and Kohnen, G and Kolanoski, H and Konietz, R and Koob, A and Koepke, L and Kopper, C and Kopper, S and Koskinen, DJ and Kowalski, M and Krings, K and Kroll, G and Kroll, M and Kunnen, J and Kurahashi, N and Kuwabara, T and Labare, Mathieu and Lanfranchi, JL and Larson, MJ and Lesiak-Bzdak, M and Leuermann, M and Leuner, J and Luenemann, J and Madsen, J and Maggi, G and Mahn, KBM and Maruyama, R and Mase, K and Matis, HS and Maunu, R and McNally, F and Meagher, K and Medici, M and Meli, Athina and Menne, T and Merino, G and Meures, T and Miarecki, S and Middell, E and Middlemas, E and Miller, J and Mohrmann, L and Montaruli, T and Morse, R and Nahnhauer, R and Naumann, U and Niederhausen, H and Nowicki, SC and Nygren, DR and Obertacke, A and Olivas, A and Omairat, A and O'Murchadha, A and Palczewski, T and Paul, L and Pepper, JA and Perez de los Heros, C and Pfendner, C and Pieloth, D and Pinat, E and Posselt, J and Price, PB and Przybylski, GT and Puetz, J and Quinnan, M and Raedel, L and Rameez, M and Rawlins, K and Redl, P and Reimann, R and Relich, M and Resconi, E and Rhode, W and Richman, M and Richter, S and Riedel, B and Robertson, S and Rongen, M and Rott, C and Ruhe, T and Ruzybayev, B and Ryckbosch, Dirk and Saba, SM and Sabbatini, L and Sander, H-G and Sandrock, A and Sandroos, J and Sarkar, S and Schatto, K and Scheriau, F and Schimp, M and Schmidt, T and Schmitz, M and Schoenen, S and Schoeneberg, S and Schoenwald, A and Schukraft, A and Schulte, L and Seckel, D and Seunarine, S and Shanidze, R and Smith, MWE and Soldin, D and Spiczak, GM and Spiering, C and Stahlberg, M and Stamatikos, M and Stanev, T and Stanisha, NA and Stasik, A and Stezelberger, T and Stokstad, RG and Stoessl, A and Strahler, EA and Stroem, R and Strotjohann, NL and Sullivan, GW and Sutherland, M and Taavola, H and Taboada, I and Ter-Antonyan, S and Terliuk, A and Tesic, G and Tilav, S and Toale, PA and Tobin, MN and Tosi, D and Tselengidou, M and Unger, E and Usner, M and Vallecorsa, S and van Eijndhoven, N and Vandenbroucke, J and van Santen, J and Vanheule, Sander and Veenkamp, J and Vehring, M and Voge, M and Vraeghe, Matthias and Walck, C and Wallraff, M and Wandkowsky, N and Weaver, C and Wendt, C and Westerhoff, S and Whelan, BJ and Whitehorn, N and Wichary, C and Wiebe, K and Wiebusch, CH and Wille, L and Williams, DR and Wissing, H and Wolf, M and Wood, TR and Woschnagg, K and Xu, DL and Xu, XW and Xu, Y and Yanez, JP and Yodh, G and Yoshida, S and Zarzhitsky, P and Zoll, M},
  issn         = {0031-9007},
  journal      = {PHYSICAL REVIEW LETTERS},
  language     = {eng},
  number       = {8},
  pages        = {7},
  title        = {Evidence for astrophysical muon neutrinos from the Northern Sky with IceCube},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.115.081102},
  volume       = {115},
  year         = {2015},
}

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