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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, et al. (2016) ASTROPHYSICAL JOURNAL LETTERS. 824(2).
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 nu(mu) 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 (similar to 100 TeV) starting event in the sample found that this event alone represents a 2.8 sigma deviation from the hypothesis that the data consists only of atmospheric background.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
astroparticle physics, neutrinos, COSMIC-RAYS, GAMMA-RAY, NEUTRINO TELESCOPE, ASTROPHYSICS
journal title
ASTROPHYSICAL JOURNAL LETTERS
Astrophys. J. Lett.
volume
824
issue
2
article number
L28
pages
8 pages
Web of Science type
Article
Web of Science id
000378168200012
JCR category
ASTRONOMY & ASTROPHYSICS
JCR impact factor
5.522 (2016)
JCR rank
8/63 (2016)
JCR quartile
1 (2016)
ISSN
2041-8205
2041-8213
DOI
10.3847/2041-8205/824/2/l28
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
8522123
handle
http://hdl.handle.net/1854/LU-8522123
date created
2017-06-02 08:41:06
date last changed
2017-06-26 13:34:33
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  abstract     = {Observation of a point source of astrophysical neutrinos would be a {\textacutedbl}smoking gun{\textacutedbl} 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 nu(mu) 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 (similar to 100 TeV) starting event in the sample found that this event alone represents a 2.8 sigma deviation from the hypothesis that the data consists only of atmospheric background.},
  articleno    = {L28},
  author       = {Aartsen, M. G. and Abraham, K. and Ackermann, M. and Adams, J. and Aguilar, J. A. and Ahlers, M. and Ahrens, M. and Altmann, D. and Andeen, K. and Anderson, T. and Ansseau, I. and Anton, G. and Archinger, M. and Arguelles, C. and Arlen, T. C. and Auffenberg, J. and Bai, X. and Barwick, S. W. and Baum, V. and Bay, R. and Beatty, J. J. and Tjus, J. Becker and Becker, K.-H. and BenZvi, S. and Berghaus, P. and Berley, D. and Bernardini, E. and Bernhard, A. and Besson, D. Z. and Binder, G. and Bindig, D. and Bissok, M. and Blaufuss, E. and Blot, S. and Boersma, D. J. and Bohm, C. and B{\"o}rner, M. and Bos, F. and Bose, D. and B{\"o}ser, S. and Botner, O. and Braun, J. and Brayeur, L. and Bretz, H.-P. and Burgman, A. and Buzinsky, N. and Casey, J. and Casier, M. and Cheung, E. and Chirkin, D. and Christov, A. and Clark, K. and Classen, L. and Coenders, S. and Collin, G. H. and Conrad, J. M. and Cowen, D. F. and Silva, A. H. Cruz and Daughhetee, J. and Davis, J. C. and Day, M. and Andr{\'e}, J. P. A. M. de and Clercq, C. De and Rosendo, E. del Pino and Dembinski, H. and De Ridder, Sam and Desiati, P. and Vries, K. D. de and Wasseige, G. de and With, M. de and DeYoung, T. and D{\'i}az-V{\'e}lez, J. C. and Lorenzo, V. di and Dujmovic, H. and Dumm, J. P. and Dunkman, M. and Eberhardt, B. and Ehrhardt, T. and Eichmann, B. and Euler, S. and Evenson, P. A. and Fahey, S. and Fazely, A. R. and Feintzeig, J. and Felde, J. and Filimonov, K. and Finley, C. and Flis, S. and F{\"o}sig, C.-C. and Fuchs, T. and Gaisser, T. K. and Gaior, R. and Gallagher, J. and Gerhardt, L. and Ghorbani, K. and Gladstone, L. and Glagla, M. and Gl{\"u}senkamp, T. and Goldschmidt, A. and Golup, G. and Gonzalez, J. G. and G{\'o}ra, D. and Grant, D. and Griffith, Z. and Ha, C. and Haack, C. and Ismail, A. 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J. and Kowalski, M. and Krings, K. and Kroll, M. and Kr{\"u}ckl, G. and Kr{\"u}ger, C. and Kunnen, J. and Kunwar, S. and Kurahashi, N. and Kuwabara, T. and Labare, Mathieu and Lanfranchi, J. L. and Larson, M. J. and Lennarz, D. and Lesiak-Bzdak, M. and Leuermann, M. and Leuner, J. and Lu, L. and L{\"u}nemann, J. and Madsen, J. and Maggi, G. and Mahn, K. B. M. and Mancina, S. and Mandelartz, M. and Maruyama, R. and Mase, K. and Matis, H. S. and Maunu, R. and McNally, F. and Meagher, K. and Medici, M. and Meier, M. and Meli, A. and Menne, T. and Merino, G. and Meures, T. and Miarecki, S. and Middell, E. and Mohrmann, L. and Montaruli, T. and Nahnhauer, R. and Naumann, U. and Neer, G. and Niederhausen, H. and Nowicki, S. C. and Nygren, D. R. and Pollmann, A. Obertacke and Olivas, A. and Omairat, A. and O{\textquoteright}Murchadha, A. and Palczewski, T. and Pandya, H. and Pankova, D. V. and Penek, {\"O}. and Pepper, J. A. and Heros, C. P{\'e}rez de los and Pfendner, C. and Pieloth, D. and Pinat, E. and Posselt, J. and Price, P. B. and Przybylski, G. T. and Quinnan, M. and Raab, C. and R{\"a}del, L. and Rameez, M. and Rawlins, K. and Reimann, R. and Relich, M. and Resconi, E. and Rhode, W. and Richman, M. and Riedel, B. and Robertson, S. and Rongen, M. and Rott, C. and Ruhe, T. and Ryckbosch, Dirk and Sabbatini, L. and Sandrock, A. and Sandroos, J. and Sarkar, S. and Satalecka, K. and Schimp, M. and Schlunder, P. and Schmidt, T. and Schoenen, S. and Sch{\"o}neberg, S. and Sch{\"o}nwald, A. and Schumacher, L. and Seckel, D. and Seunarine, S. and Soldin, D. and Song, M. and Spiczak, G. M. and Spiering, C. and Stahlberg, M. and Stamatikos, M. and Stanev, T. and Stasik, A. and Steuer, A. and Stezelberger, T. and Stokstad, R. G. and St{\"o}{\ss}l, A. and Str{\"o}m, R. and Strotjohann, N. L. and Sullivan, G. W. and Sutherland, M. and Taavola, H. and Taboada, I. and Tatar, J. and Ter-Antonyan, S. and Terliuk, A. and Te\v{s}i\'{c}, G. and Tilav, S. and Toale, P. A. and Tobin, M. N. and Toscano, S. and Tosi, D. and Tselengidou, M. and Turcati, A. and Unger, E. and Usner, M. and Vallecorsa, S. and Vandenbroucke, J. and Eijndhoven, N. van and Vanheule, Sander and Rossem, M. van and Santen, J. van and Veenkamp, J. and Vehring, M. and Voge, M. and Vraeghe, Matthias and Walck, C. and Wallace, A. and Wallraff, M. and Wandkowsky, N. and Weaver, Ch. and Wendt, C. and Westerhoff, S. and Whelan, B. J. and Whitehorn, N. and Wickmann, S. and Wiebe, K. and Wiebusch, C. H. and Wille, L. and Williams, D. R. and Wills, L. and Wissing, H. and Wolf, M. and Wood, T. R. and Woschnagg, K. and Xu, D. L. and Xu, X. W. and Xu, Y. and Yanez, J. P. and Yodh, G. and Yoshida, S. and Zoll, M.},
  issn         = {2041-8205},
  journal      = {ASTROPHYSICAL JOURNAL LETTERS},
  keyword      = {astroparticle physics,neutrinos,COSMIC-RAYS,GAMMA-RAY,NEUTRINO TELESCOPE,ASTROPHYSICS},
  language     = {eng},
  number       = {2},
  pages        = {8},
  title        = {Lowering IceCube{\textquoteright}s energy threshold for point source searches in the southern sky},
  url          = {http://dx.doi.org/10.3847/2041-8205/824/2/l28},
  volume       = {824},
  year         = {2016},
}

Chicago
Aartsen, M. G., K. Abraham, M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens, et al. 2016. “Lowering IceCube’s Energy Threshold for Point Source Searches in the Southern Sky.” Astrophysical Journal Letters 824 (2).
APA
Aartsen, M. G., Abraham, K., Ackermann, M., Adams, J., Aguilar, J. A., Ahlers, M., Ahrens, M., et al. (2016). Lowering IceCube’s energy threshold for point source searches in the southern sky. ASTROPHYSICAL JOURNAL LETTERS, 824(2).
Vancouver
1.
Aartsen MG, Abraham K, Ackermann M, Adams J, Aguilar JA, Ahlers M, et al. Lowering IceCube’s energy threshold for point source searches in the southern sky. ASTROPHYSICAL JOURNAL LETTERS. 2016;824(2).
MLA
Aartsen, M. G., K. Abraham, M. Ackermann, et al. “Lowering IceCube’s Energy Threshold for Point Source Searches in the Southern Sky.” ASTROPHYSICAL JOURNAL LETTERS 824.2 (2016): n. pag. Print.