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Title: Search for Astrophysical Sources of Neutrinos Using Cascade Events in IceCube

Abstract

The IceCube neutrino observatory has established the existence of a flux of high-energy astrophysical neutrinos, which is inconsistent with the expectation from atmospheric backgrounds at a significance greater than 5 σ . This flux has been observed in analyses of both track events from muon neutrino interactions and cascade events from interactions of all neutrino flavors. Searches for astrophysical neutrino sources have focused on track events due to the significantly better angular resolution of track reconstructions. To date, no such sources have been confirmed. Here we present the first search for astrophysical neutrino sources using cascades interacting in IceCube with deposited energies as small as 1 TeV. No significant clustering was observed in a selection of 263 cascades collected from 2010 May to 2012 May. We show that compared to the classic approach using tracks, this statistically independent search offers improved sensitivity to sources in the southern sky, especially if the emission is spatially extended or follows a soft energy spectrum. This enhancement is due to the low background from atmospheric neutrinos forming cascade events and the additional veto of atmospheric neutrinos at declinations ≲−30°.

Authors:
 [1];  [2]; ;  [3]; ;  [4];  [5];  [6];  [7]; ;  [8];  [9];  [10]; ;  [11];  [12];  [13];  [14];  [15];
  1. Department of Physics, University of Adelaide, Adelaide, 5005 (Australia)
  2. DESY, D-15735 Zeuthen (Germany)
  3. Dept. of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch (New Zealand)
  4. Université Libre de Bruxelles, Science Faculty CP230, B-1050 Brussels (Belgium)
  5. Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen (Denmark)
  6. Oskar Klein Centre and Dept. of Physics, Stockholm University, SE-10691 Stockholm (Sweden)
  7. Département de physique nucléaire et corpusculaire, Université de Genève, CH-1211 Genève (Switzerland)
  8. Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91058 Erlangen (Germany)
  9. Department of Physics, Marquette University, Milwaukee, WI, 53201 (United States)
  10. Dept. of Physics, Pennsylvania State University, University Park, PA 16802 (United States)
  11. Dept. of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139 (United States)
  12. III. Physikalisches Institut, RWTH Aachen University, D-52056 Aachen (Germany)
  13. Physics Department, South Dakota School of Mines and Technology, Rapid City, SD 57701 (United States)
  14. Dept. of Physics and Astronomy, University of California, Irvine, CA 92697 (United States)
  15. Institute of Physics, University of Mainz, Staudinger Weg 7, D-55099 Mainz (Germany)
Publication Date:
OSTI Identifier:
22679860
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 846; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; COMPARATIVE EVALUATIONS; COSMIC NEUTRINOS; EMISSION; ENERGY SPECTRA; FLAVOR MODEL; ICECUBE NEUTRINO DETECTOR; MUON NEUTRINOS; MUONS; NEUTRINO-MUON INTERACTIONS; PARTICLE TRACKS; RESOLUTION; SENSITIVITY; TEV RANGE

Citation Formats

Aartsen, M. G., Ackermann, M., Adams, J., Bagherpour, H., Aguilar, J. A., Ansseau, I., Ahlers, M., Ahrens, M., Al Samarai, I., Altmann, D., Anton, G., Andeen, K., Anderson, T., Argüelles, C., Axani, S., Auffenberg, J., Bai, X., Barwick, S. W., Baum, V., Collaboration: IceCube Collaboration, and others, and. Search for Astrophysical Sources of Neutrinos Using Cascade Events in IceCube. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA8508.
Aartsen, M. G., Ackermann, M., Adams, J., Bagherpour, H., Aguilar, J. A., Ansseau, I., Ahlers, M., Ahrens, M., Al Samarai, I., Altmann, D., Anton, G., Andeen, K., Anderson, T., Argüelles, C., Axani, S., Auffenberg, J., Bai, X., Barwick, S. W., Baum, V., Collaboration: IceCube Collaboration, & others, and. Search for Astrophysical Sources of Neutrinos Using Cascade Events in IceCube. United States. doi:10.3847/1538-4357/AA8508.
Aartsen, M. G., Ackermann, M., Adams, J., Bagherpour, H., Aguilar, J. A., Ansseau, I., Ahlers, M., Ahrens, M., Al Samarai, I., Altmann, D., Anton, G., Andeen, K., Anderson, T., Argüelles, C., Axani, S., Auffenberg, J., Bai, X., Barwick, S. W., Baum, V., Collaboration: IceCube Collaboration, and others, and. Sun . "Search for Astrophysical Sources of Neutrinos Using Cascade Events in IceCube". United States. doi:10.3847/1538-4357/AA8508.
@article{osti_22679860,
title = {Search for Astrophysical Sources of Neutrinos Using Cascade Events in IceCube},
author = {Aartsen, M. G. and Ackermann, M. and Adams, J. and Bagherpour, H. and Aguilar, J. A. and Ansseau, I. and Ahlers, M. and Ahrens, M. and Al Samarai, I. and Altmann, D. and Anton, G. and Andeen, K. and Anderson, T. and Argüelles, C. and Axani, S. and Auffenberg, J. and Bai, X. and Barwick, S. W. and Baum, V. and Collaboration: IceCube Collaboration and others, and},
abstractNote = {The IceCube neutrino observatory has established the existence of a flux of high-energy astrophysical neutrinos, which is inconsistent with the expectation from atmospheric backgrounds at a significance greater than 5 σ . This flux has been observed in analyses of both track events from muon neutrino interactions and cascade events from interactions of all neutrino flavors. Searches for astrophysical neutrino sources have focused on track events due to the significantly better angular resolution of track reconstructions. To date, no such sources have been confirmed. Here we present the first search for astrophysical neutrino sources using cascades interacting in IceCube with deposited energies as small as 1 TeV. No significant clustering was observed in a selection of 263 cascades collected from 2010 May to 2012 May. We show that compared to the classic approach using tracks, this statistically independent search offers improved sensitivity to sources in the southern sky, especially if the emission is spatially extended or follows a soft energy spectrum. This enhancement is due to the low background from atmospheric neutrinos forming cascade events and the additional veto of atmospheric neutrinos at declinations ≲−30°.},
doi = {10.3847/1538-4357/AA8508},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 846,
place = {United States},
year = {2017},
month = {9}
}

Works referencing / citing this record:

Search for Astrophysical Sources of Neutrinos Using Cascade Events in IceCube
text, January 2017

  • Aartsen, M. G.; Ackermann, M.; Adams, J.
  • Deutsches Elektronen-Synchrotron, DESY, Hamburg
  • DOI: 10.3204/pubdb-2017-11452

Search for neutrinos from decaying dark matter with IceCube: IceCube Collaboration
journal, October 2018


Monitoring and Multi-Messenger Astronomy with IceCube
journal, March 2019