Time-Integrated Searches for Sub-TeV Neutrino Sources with IceCube-DeepCore
Abstract
We have developed techniques for a competitive sub-TeV time-integrated neutrino search and applied it to 11.1 years of IceCube-DeepCore data. The DeepCore subarray lowers the sensitivity of IceCube down to sub-TeV energies and is especially interesting for objects with soft spectra. Three studies were performed: a search for neutrino emission from AGN exhibiting high intrinsic X-ray flux, including NGC 1068, as identified by SWIFT/BAT; a search for neutrino emission from Galactic objects identified by Fermi-LAT as exhibiting a spectral shape consistent with neutral pion decay; and an all-sky search for neutrino point sources. Objects for this study were selected given their prospects for sub-TeV neutrino emission. No evidence for sub-TeV neutrino emission is found in any of the searches performed. Finally, for each catalog of objects, we use a statistical combination of the p-values via a binomial test to search for aggregated neutrino emission from a subset of the objects. Neither of the binomial tests yields significant results. For NGC 1068, assuming a power law spectrum with index 3.4, the 90% confidence level upper limit on per-flavor neutrino emission in the 30--400 GeV range is $Φ_{ν+\barν}|_{\mathrm{1 TeV}} < 9.5 \times 10^{-11}$ TeV$^{-1}$ cm$^{-2}$ s$^{-1}$, a factor of two higher than the extrapolation of IceCube's measurement at higher energies. We additionally provide neutrino flux upper limits for a variety of spectra.
Authors 100
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Department of Physics , Loyola University Chicago , Chicago , IL 60660 , USA
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Dept. of Physics and Astronomy , University of Canterbury , Private Bag 4800 , Christchurch , New Zealand
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Université Libre de Bruxelles , Science Faculty CP230 , B-1050 Brussels , Belgium
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Niels Bohr Institute , University of Copenhagen , DK-2100 Copenhagen , Denmark
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Dept. of Physics , TU Dortmund University , D-44221 Dortmund , Germany
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Dept. of Physics and Astronomy , University of Kansas , Lawrence , KS 66045 , USA
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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Department of Physics and Laboratory for Particle Physics and Cosmology , Harvard University , Cambridge , MA 02138 , USA
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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University of California, Berkeley
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Dept. of Physics , University of California , Berkeley , CA 94720 , USA
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Dept. of Astronomy , Ohio State University , Columbus , OH 43210 , USA
Dept. of Physics and Center for Cosmology and Astro-Particle Physics , Ohio State University , Columbus , OH 43210 , USA
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Fakultät für Physik & Astronomie , Ruhr-Universität Bochum , D-44780 Bochum , Germany
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III. Physikalisches Institut , RWTH Aachen University , D-52056 Aachen , Germany
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Technical University of Munich
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Physik-department , Technische Universität München , D-85748 Garching , Germany
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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Dept. of Physics and Astronomy , University of Kansas , Lawrence , KS 66045 , USA
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University of Maryland, College Park
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Dept. of Physics , University of Maryland , College Park , MD 20742 , USA
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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Karlsruhe Institute of Technology
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Karlsruhe Institute of Technology , Institute for Astroparticle Physics , D-76021 Karlsruhe , Germany
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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III. Physikalisches Institut , RWTH Aachen University , D-52056 Aachen , Germany
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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University of Maryland, College Park
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Dept. of Physics , University of Maryland , College Park , MD 20742 , USA
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Friedrich-Alexander-Universität Erlangen-Nürnberg
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Erlangen Centre for Astroparticle Physics , Friedrich-Alexander-Universität Erlangen-Nürnberg , D-91058 Erlangen , Germany
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Department of Physics , University of Adelaide , Adelaide , 5005 , Australia
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University of Nevada, Las Vegas
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Department of Physics & Astronomy , University of Nevada , Las Vegas , NV 89154 , USA
Nevada Center for Astrophysics , University of Nevada , Las Vegas , NV 89154 , USA
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Université Libre de Bruxelles , Science Faculty CP230 , B-1050 Brussels , Belgium
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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III. Physikalisches Institut , RWTH Aachen University , D-52056 Aachen , Germany
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Vrije Universiteit Brussel (VUB) , Dienst ELEM , B-1050 Brussels , Belgium
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UCLouvain , Centre for
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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Dept. of Physics and Astronomy , Michigan State University , East Lansing , MI 48824 , USA
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University of Nevada, Las Vegas
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Department of Physics & Astronomy , University of Nevada , Las Vegas , NV 89154 , USA
Nevada Center for Astrophysics , University of Nevada , Las Vegas , NV 89154 , USA
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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Friedrich-Alexander-Universität Erlangen-Nürnberg
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Erlangen Centre for Astroparticle Physics , Friedrich-Alexander-Universität Erlangen-Nürnberg , D-91058 Erlangen , Germany
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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Affiliation as printed
III. Physikalisches Institut , RWTH Aachen University , D-52056 Aachen , Germany
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Technical University of Munich
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Physik-department , Technische Universität München , D-85748 Garching , Germany
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Friedrich-Alexander-Universität Erlangen-Nürnberg
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Erlangen Centre for Astroparticle Physics , Friedrich-Alexander-Universität Erlangen-Nürnberg , D-91058 Erlangen , Germany
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Technical University of Munich
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Physik-department , Technische Universität München , D-85748 Garching , Germany
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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Dept. of Physics , TU Dortmund University , D-44221 Dortmund , Germany
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Karlsruhe Institute of Technology
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Karlsruhe Institute of Technology , Institute for Astroparticle Physics , D-76021 Karlsruhe , Germany
Karlsruhe Institute of Technology , Institute of Experimental Particle Physics , D-76021 Karlsruhe , Germany
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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University of Maryland, College Park
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Dept. of Physics , University of Maryland , College Park , MD 20742 , USA
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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University of Maryland, College Park
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Dept. of Physics , University of Maryland , College Park , MD 20742 , USA
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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Dept. of Physics and
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Dept. of Physics , TU Dortmund University , D-44221 Dortmund , Germany
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Southern University and Agricultural and Mechanical College
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Dept. of Physics , Southern University , Baton Rouge , LA 70813 , USA
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Humboldt-Universität zu Berlin
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Institut für Physik , Humboldt-Universität zu Berlin , D-12489 Berlin , Germany
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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Fakultät für Physik & Astronomie , Ruhr-Universität Bochum , D-44780 Bochum , Germany
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The International Center for Hadron Astrophysics , Chiba University , Chiba 263-8522 , Japan
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III. Physikalisches Institut , RWTH Aachen University , D-52056 Aachen , Germany
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