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LOWERING ICECUBE'S ENERGY THRESHOLD for POINT SOURCE SEARCHES in the SOUTHERN SKY

  • M. G. Aartsen
  • , K. Abraham
  • , M. Ackermann
  • , J. Adams
  • , J. A. Aguilar
  • , M. Ahlers
  • , M. Ahrens
  • , D. Altmann
  • , K. Andeen
  • , T. Anderson
  • , I. Ansseau
  • , G. Anton
  • , M. Archinger
  • , C. Arguelles
  • , T. C. Arlen
  • , J. Auffenberg
  • , X. Bai
  • , S. W. Barwick
  • , V. Baum
  • , R. Bay
  • J. J. Beatty, J. Becker Tjus, K. H. Becker, S. Benzvi, P. Berghaus, D. Berley, E. Bernardini, A. Bernhard, D. Z. Besson, G. Binder, D. Bindig, M. Bissok, E. Blaufuss, S. Blot, D. J. Boersma, C. Bohm, M. Börner, F. Bos, D. Bose, S. Böser, O. Botner, J. Braun, L. Brayeur, H. P. Bretz, A. Burgman, N. Buzinsky, J. Casey, M. Casier, E. Cheung, D. Chirkin, A. Christov, K. Clark, L. Classen, S. Coenders, G. H. Collin, J. M. Conrad, D. F. Cowen, A. H.Cruz Silva, J. Daughhetee, J. C. Davis, M. Day, J. P.A.M.De André, C. De Clercq, E. Del Pino Rosendo, H. Dembinski, S. De Ridder, P. Desiati, K. D.De Vries, G. De Wasseige, M. De With, T. Deyoung, J. C. Daz-Vélez, V. Di Lorenzo, H. Dujmovic, J. P. Dumm, M. Dunkman, B. Eberhardt, T. Ehrhardt, B. Eichmann, S. Euler, P. A. Evenson, S. Fahey, A. R. Fazely, J. Feintzeig, J. Felde, K. Filimonov, C. Finley, S. Flis, C. C. Fösig, T. Fuchs, T. K. Gaisser, R. Gaior, J. Gallagher, L. Gerhardt, K. Ghorbani, L. Gladstone, M. Glagla, T. Glüsenkamp, A. Goldschmidt, G. Golup, J. G. Gonzalez, D. Góra, D. Grant, Z. Griffith, C. Ha, C. Haack, A. Haj Ismail, A. Hallgren, F. Halzen, E. Hansen, B. Hansmann, T. Hansmann, K. Hanson, D. Hebecker, D. Heereman, K. Helbing, R. Hellauer, S. Hickford, J. Hignight, G. C. Hill, K. D. Hoffman, R. Hoffmann, K. Holzapfel, A. Homeier, K. Hoshina, F. Huang, M. Huber, W. Huelsnitz, K. Hultqvist, S. In, A. Ishihara, E. Jacobi, G. S. Japaridze, M. Jeong, K. Jero, B. J.P. Jones, M. Jurkovic, A. Kappes, T. Karg, A. Karle, U. Katz, M. Kauer, A. Keivani, J. L. Kelley, J. Kemp, A. Kheirandish, M. Kim, T. Kintscher, J. Kiryluk, S. R. Klein, G. Kohnen, R. Koirala, H. Kolanoski, R. Konietz, L. Köpke, C. Kopper, S. Kopper, D. J. Koskinen, M. Kowalski, K. Krings, M. Kroll, G. Krückl, C. Krüger, J. Kunnen, S. Kunwar, N. Kurahashi, T. Kuwabara, M. Labare, J. L. Lanfranchi, M. J. Larson, D. Lennarz, M. Lesiak-Bzdak, M. Leuermann, J. Leuner, L. Lu, J. Lünemann, J. Madsen, G. Maggi, K. B.M. Mahn, S. Mancina, M. Mandelartz, R. Maruyama, K. Mase, H. S. Matis, R. Maunu, F. McNally, K. Meagher, M. Medici, M. Meier, A. Meli, T. Menne, G. Merino, T. Meures, S. Miarecki, E. Middell, L. Mohrmann, T. Montaruli, R. Nahnhauer, U. Naumann, G. Neer, H. Niederhausen, S. C. Nowicki, D. R. Nygren, A. Obertacke Pollmann, A. Olivas, A. Omairat, A. O'Murchadha, T. Palczewski, H. Pandya, D. V. Pankova, O. Penek, J. A. Pepper, C. Pérez De Los Heros, C. Pfendner, D. Pieloth, E. Pinat, J. Posselt, P. B. Price, G. T. Przybylski, M. Quinnan, C. Raab, L. Rädel, M. Rameez, K. Rawlins, R. Reimann, M. Relich, E. Resconi, W. Rhode, M. Richman, B. Riedel, S. Robertson, M. Rongen, C. Rott, T. Ruhe, D. Ryckbosch, L. Sabbatini, A. Sandrock, J. Sandroos, S. Sarkar, K. Satalecka, M. Schimp, P. Schlunder, T. Schmidt, S. Schoenen, S. Schöneberg, A. Schönwald, L. Schumacher, D. Seckel, S. Seunarine, D. Soldin, M. Song, G. M. Spiczak, C. Spiering, M. Stahlberg, M. Stamatikos, T. Stanev, A. Stasik, A. Steuer, T. Stezelberger, R. G. Stokstad, A. Stößl, R. Ström, N. L. Strotjohann, G. W. Sullivan, M. Sutherland, H. Taavola, I. Taboada, J. Tatar, S. Ter-Antonyan, A. Terliuk, G. Tešić, S. Tilav, P. A. Toale, M. N. Tobin, S. Toscano, D. Tosi, M. Tselengidou, A. Turcati, E. Unger, M. Usner, S. Vallecorsa, J. Vandenbroucke, N. Van Eijndhoven, S. Vanheule, M. Van Rossem, J. Van Santen, J. Veenkamp, M. Vehring, M. Voge, M. Vraeghe, C. Walck, A. Wallace, M. Wallraff, N. Wandkowsky, Ch Weaver, C. Wendt, S. Westerhoff, B. J. Whelan, N. Whitehorn, S. Wickmann, K. Wiebe, C. H. Wiebusch, L. Wille, D. R. Williams, L. Wills, H. Wissing, M. Wolf, T. R. Wood, K. Woschnagg, D. L. Xu, X. W. Xu, Y. Xu, J. P. Yanez, G. Yodh, S. Yoshida, M. Zoll
  • University of Adelaide
  • Technical University of Munich
  • German Electron Synchrotron
  • University of Canterbury
  • Université libre de Bruxelles
  • University of Wisconsin-Madison
  • Stockholm University
  • Friedrich-Alexander University Erlangen-Nürnberg
  • Marquette University
  • Pennsylvania State University
  • Johannes Gutenberg University Mainz
  • Massachusetts Institute of Technology
  • RWTH Aachen University
  • South Dakota School of Mines & Technology
  • University of California at Irvine
  • University of California at Berkeley
  • Ohio State University
  • Ruhr University Bochum
  • University of Wuppertal
  • University of Rochester
  • University of Maryland, College Park
  • University of Kansas
  • Lawrence Berkeley National Laboratory
  • Uppsala University
  • TU Dortmund University
  • Sungkyunkwan University
  • Vrije Universiteit Brussel
  • University of Alberta
  • Georgia Institute of Technology
  • University of Geneva
  • University of Toronto
  • Michigan State University
  • University of Delaware
  • Ghent University
  • Humboldt University of Berlin
  • Southern University and A&M College
  • Chiba University
  • University of Copenhagen
  • University of Bonn
  • The University of Tokyo
  • Clark Atlanta University
  • Yale University
  • Universite de Mons
  • Drexel University
  • Stony Brook University
  • University of Wisconsin-River Falls
  • University of Alabama
  • University of Alaska Anchorage
  • University of Oxford
  • NASA Goddard Space Flight Center

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

Observation of a point source of astrophysical neutrinos would be a "smoking gun" signature of a cosmic-ray accelerator. While IceCube has recently discovered a diffuse flux of astrophysical neutrinos, no localized point source has been observed. Previous IceCube searches for point sources in the southern sky were restricted by either an energy threshold above a few hundred TeV or poor neutrino angular resolution. Here we present a search for southern sky point sources with greatly improved sensitivities to neutrinos with energies below 100 TeV. By selecting charged-current ν μ interacting inside the detector, we reduce the atmospheric background while retaining efficiency for astrophysical neutrino-induced events reconstructed with sub-degree angular resolution. The new event sample covers three years of detector data and leads to a factor of 10 improvement in sensitivity to point sources emitting below 100 TeV in the southern sky. No statistically significant evidence of point sources was found, and upper limits are set on neutrino emission from individual sources. A posteriori analysis of the highest-energy (∼100 TeV) starting event in the sample found that this event alone represents a 2.8σ deviation from the hypothesis that the data consists only of atmospheric background.

Original languageEnglish
Article numberL28
JournalAstrophysical Journal Letters
Volume824
Issue number2
DOIs
StatePublished - Jun 20 2016

Keywords

  • astroparticle physics
  • neutrinos

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