Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-30
JCAP 0706:003,2007
Astronomy and Astrophysics
Astrophysics
27 pages, 13 figures. Several figures have been added or replaced. A new model for the ISM distribution has been considered. A
Scientific paper
10.1088/1475-7516/2007/06/003
We simulate the neutrino and $\gamma$-ray emissions of the Galaxy which are originated from the hadronic scattering of cosmic rays (CR) with the interstellar medium (ISM). Rather than assuming a uniform CR density, we estimate the spatial distribution of CR nuclei by means of numerical simulations. We consider several models of the galactic magnetic field and of the ISM distribution finding only a weak dependence of our results on their choice. We found that by extrapolating the predicted $\gamma$-ray spectra down to few GeV we get a good agreement with EGRET measurements. Then, we can reliably compare our predictions with available observations above the TeV both for the $\gamma$-rays and the neutrinos. We confirm that the excesses observed by MILAGRO in the Cygnus region and by HESS in the Galactic Centre Ridge cannot be explained without invoking significant CR over-densities in those regions. Finally, we discuss the perspectives that a km$^3$ neutrino telescope based in the North hemisphere has to measure the diffuse emission from the inner Galaxy.
Evoli Carmelo
Grasso Dario
Maccione Luca
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