Abstract
The last IceCube catalog of High Energy Starting Events (HESE) obtained with a livetime of 1347 days comprises 54 neutrino events equally-distributed between the three families with energies between 25 TeV and few PeVs. Considering the homogeneous flavors distribution (1:1:1) and the spectral features of these neutrinos the IceCube collaboration claims the astrophysical origin of these events with more than $5\sigma$. The spatial distribution of cited events does not show a clear correlation with known astrophysical accelerators leaving opened both the Galactic and the extra-Galactic origin interpretations. Here, we compute the neutrino diffuse emission of our Galaxy on the basis of a recently proposed phenomenological model characterized by radially-dependent cosmic-ray (CR) transport properties. We show that the astrophysical spectrum measured by IceCube experiment can be well explained adding to the diffuse Galactic neutrino flux (obtained with this new model) a extra-Galactic component derived from the astrophysical muonic neutrinos reconstructed in the Northern hemisphere. A good agreement between the expected astrophysical neutrino flux and the IceCube data is found for the full sky as well as for the Galactic plane region.
Highlights
We show that the astrophysical spectrum measured by IceCube experiment can be well explained adding to the diffuse Galactic neutrino flux a extra-Galactic component derived from the astrophysical muonic neutrinos reconstructed in the Northern hemisphere
We show that the measured full sky neutrino spectrum as well as the derived neutrino spectrum of the Galactic plane region ( 1< 7.5◦) are well described by the sum of Galactic (KRA ) and EG selected ν spectra
Since the inner Galactic plane is positioned in the South hemisphere, we took the ν flux reconstructed in the Northern hemisphere as a good estimate of the isotropic EG neutrino component
Summary
In this work we present the expected Galactic diffuse neutrino flux, computed with a recently introduced scenario (KRA ) considering a radially-dependent diffusion coefficient [5], for different regions of the sky. To explain the spectra obtained with IceCube measurements for these regions it is necessary to account for a extra-Galactic (EG) component We assume this EG component to be isotropic and use the astrophysical muonic neutrino IceCube measurements from the Northern hemisphere [6] to obtain an estimation of this flux. We show that the measured full sky neutrino spectrum as well as the derived neutrino spectrum of the Galactic plane region ( 1< 7.5◦) are well described by the sum of Galactic (KRA ) and EG (best-fit of ν from Northern hemisphere) selected ν spectra
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