Constraints on the neutrino emission from the Galactic Ridge with the ANTARES telescope
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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 class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303112&_mathId=si1.gif&_user=111111111&_pii=S0370269316303112&_rdoc=1&_issn=03702693&md5=6588a7a55b14186b6156577610f6e996" title="Click to view the MathML source">Γ=2.4class="mathContainer hidden">class="mathCode">Γ=2.4 the 90% confidence level flux upper limit at 100 TeV for one neutrino flavour corresponds to class="mathmlsrc">title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303112&_mathId=si2.gif&_user=111111111&_pii=S0370269316303112&_rdoc=1&_issn=03702693&md5=eca3981f064cd7c0fc1f1d2832b717e6">class="imgLazyJSB inlineImage" height="21" width="294" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316303112-si2.gif">class="mathContainer hidden">class="mathCode">Φ01f(100 TeV)=2.01017 GeV1cm2s1sr1. 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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