New Constraints on all flavour Galactic diffuse neutrino emission with the ANTARES telescope
August 16, 2017
August 03, 2018
The characterization of the high energy neutrino flux from interaction of galactic Cosmic Rays with interstellar matter during their diffusion could shed a new light on Galactic accelerator features, gas distribution morphology and Galactic cosmic ray transport. The central Galactic plane can host an enhanced neutrino production, thus leading to anisotropies in the extraterrestrial neutrino signal as measured by the IceCube Collaboration. The ANTARES neutrino telescope, located in the Mediterranean Sea, offers a favourable view on this part of the sky, thereby allowing for a contribution to the determination of this flux. The expected diffuse Galactic neutrino emission can be obtained linking a model of generation and propagation of cosmic rays with
the morphology of the gas distribution in the Milky Way. In this paper, the newly introduced so-called “Gamma model” is assumed as reference. Considering a radially-dependent diffusion coefficient, this model accounts for local cosmic ray measurements, as well as Galactic gamma ray observations. Nine years of ANTARES data are used in this work to search for a possible Galactic contribution to the IceCube neutrino signal. All flavour neutrino interactions are consid-
ered, using events with either a track or shower signature. No excess of events is observed and an upper limit is set on the neutrino flux of 1.2 − 1.1 times the prediction of the “Gamma model” depending on the cosmic ray spectrum cut-off. This limit excludes the diffuse Galactic neutrino emission as the major cause of the “spectral anomaly” between the two hemispheres measured by IceCube.
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