Galaxias con formación estelar activa como emisores de radiación gamma

Star-forming galaxies are the first extragalactic sources whose total emission, or at least a large amount of it, comes from the cosmic rays interactions accelerated by shock fronts in a young stellar population environment but not from the active galactic nuclei. A strong evidence of this fact is the quasi-linear correlation between the -ray luminosity of these galaxies and different indicators of their star formation rate. In this work, we report a detailed analysis of this correlation, by quantifying its nonlinearity in the different energy bands provided by the Fermi catalog. We discarded the linearity with a high level of confidence and we observed possibles variation with the energy. These results raise the question of the origin of the correlation, which answer required the development of theoretical models that describe the cosmic rays production inside these galaxies and the -ray emission due to the cosmic rays interacting with their matter and radiation fields.