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Accueil > Séminaires > Séminaires passés > Séminaires de 2010 > Gamma ray astronomy and the origin of galactic cosmic rays

Stefano Gabici (APC)

Gamma ray astronomy and the origin of galactic cosmic rays

Jeudi 4 Novembre 2010, 14h15

Diffusive shock acceleration operating at expanding supernova remnant shells is by far the most popular model for the origin of galactic cosmic rays. Despite the general consensus received by the model, an unambiguous and conclusive proof of the supernova remnant hypothesis is still missing. In this context, the recent developments in gamma ray astronomy provide us with precious insights into the problem of the origin of galactic cosmic rays, since production of gamma rays is expected both during the acceleration of cosmic rays at supernova remnant shocks and during their subsequent propagation in the interstellar medium. In particular, the recent detection of a number of supernova remnants at TeV energies nicely fits with the model, but it still does not constitute a conclusive proof of it, mainly due to the difficulty of disentangling the hadronic and leptonic contributions to the observed gamma ray emission. In this talk, the most relevant cosmic-ray-related results of gamma ray astronomy will be briefly summarized, and the foreseeable contribution of future gamma ray observations to the final solution of the problem of cosmic ray origin will be discussed.