Constraints on the neutrino emission from the Galactic Ridge with the ANTARES telescope

S. Adrián-Martínez (Institut d'Investigació per a la Gestió Integrada de les Zones Costaneres (IGIC), Universitat Politècnica de València, C/ Paranimf 1, Gandia, 46730, Spain) ; A. Albert (GRPHE, Université de Haute Alsace, Institut universitaire de technologie de Colmar, 34 rue du Grillenbreit, BP 50568, Colmar, 68008, France) ; M. André (Technical University of Catalonia, Laboratory of Applied Bioacoustics, Rambla Exposició, Vilanova i la Geltrú, Barcelona, 08800, Spain) ; M. Anghinolfi (INFN – Sezione di Genova, Via Dodecaneso 33, Genova, 16146, Italy) ; G. Anton (Friedrich–Alexander-Universität Erlangen–Nürnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, Erlangen, 91058, Germany) ; et al. - Show all 119 authors

A highly significant excess of high-energy astrophysical neutrinos has been reported by the IceCube Collaboration. Some features of the energy and declination distributions of IceCube events hint at a North/South asymmetry of the neutrino flux. This could be due to the presence of the bulk of our Galaxy in the Southern hemisphere. The ANTARES neutrino telescope, located in the Mediterranean Sea, has been taking data since 2007. It offers the best sensitivity to muon neutrinos produced by galactic cosmic ray interactions in this region of the sky. In this letter a search for an extended neutrino flux from the Galactic Ridge region is presented. Different models of neutrino production by cosmic ray propagation are tested. No excess of events is observed and upper limits for different neutrino flux spectral indices Γ are set. For Γ=2.4 the 90% confidence level flux upper limit at 100 TeV for one neutrino flavour corresponds to Φ01f(100 TeV)=2.0⋠10−17 GeV−1cm−2s−1sr−1 . Under this assumption, at most two events of the IceCube cosmic candidates can originate from the Galactic Ridge. A simple power-law extrapolation of the Fermi-LAT flux to account for IceCube High Energy Starting Events is excluded at 90% confidence level.

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      "title": "Constraints on the neutrino emission from the Galactic Ridge with the ANTARES telescope"
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      "value": "A highly significant excess of high-energy astrophysical neutrinos has been reported by the IceCube Collaboration. Some features of the energy and declination distributions of IceCube events hint at a North/South asymmetry of the neutrino flux. This could be due to the presence of the bulk of our Galaxy in the Southern hemisphere. The ANTARES neutrino telescope, located in the Mediterranean Sea, has been taking data since 2007. It offers the best sensitivity to muon neutrinos produced by galactic cosmic ray interactions in this region of the sky. In this letter a search for an extended neutrino flux from the Galactic Ridge region is presented. Different models of neutrino production by cosmic ray propagation are tested. No excess of events is observed and upper limits for different neutrino flux spectral indices \u00ce\u0093 are set. For \u00ce\u0093=2.4 the 90% confidence level flux upper limit at 100 TeV for one neutrino flavour corresponds to \u00ce\u00a601f(100\u00c2 TeV)=2.0\u00e2\u008b 10\u00e2\u0088\u009217\u00c2 GeV\u00e2\u0088\u00921cm\u00e2\u0088\u00922s\u00e2\u0088\u00921sr\u00e2\u0088\u00921 . Under this assumption, at most two events of the IceCube cosmic candidates can originate from the Galactic Ridge. A simple power-law extrapolation of the Fermi-LAT flux to account for IceCube High Energy Starting Events is excluded at 90% confidence level."
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Published on:
29 June 2016
Publisher:
Elsevier
Published in:
Physics Letters B (2016)

DOI:
https://doi.org/10.1016/j.physletb.2016.06.051
Copyrights:
The Authors
Licence:
CC-BY-3.0

Fulltext files: