Speaker
Dr
Dario Grasso
(INFN, Pisa)
Description
As recently shown, Fermi-LAT measurements of the diffuse gamma-ray emission of the Galaxy favor the presence of a smooth softening of the primary cosmic-ray spectrum with the Galactocentric distance. This result can be interpreted in terms of a spatial dependent rigidity scaling of the diffusion coefficient. The DRAGON code has been used to build a model which implements such feature reproducing latest Fermi-LAT results as well as local cosmic-ray measurements including PAMELA, AMS-02 and CREAM ones.
Here we show that if extrapolated at larger energies the model grasps the gamma-ray flux measured by MILAGRO at 15 TeV from the inner Galactic plane region as well as that measured by H.E.S.S. from the Galactic ridge. Furthermore, considering the presence of a large reservoir of gas in a very extended halo around the Galaxy, recently inferred from X–ray observations, we show as our model also predicts a neutrino emission which may account for a significant fraction, as well as for the spectral shape, of the astrophysical flux measured by IceCube above 25 TeV.
| Registration number following "ICRC2015-I/" | 343 |
|---|---|
| Collaboration | -- not specified -- |
Primary authors
Dr
Alfredo Urbano
(SISSA, Trieste, Italy)
Antonio Marinelli
(I.N.F.N. and Università Pisa)
Daniele Gaggero
Dr
Dario Grasso
(INFN, Pisa)
Dr
Mauro Valli
(SISSA, Trieste, Italy)
