Abstract
The current generation of high-energy and very-high-energy telescopes made it possible to probe a new class of gamma-ray emitters: star-forming galaxies. A very likely process for the generation of a significant fraction of the observed gamma-rays is the interaction of cosmic rays with the interstellar medium. Thanks to Fermi/LAT observations, a population study was recently performed over a sample of more than 60 luminous infrared galaxies. This revealed an unexpected, almost linear correlation between star formation tracers and 100 MeV-100 GeV luminosity. I present a model for the non-thermal emissions from steady-state cosmic-ray populations interacting with the interstellar medium in star-forming galaxies, with the goal of establishing whether the current experimental data in the GeV range can constrain theories on cosmic ray acceleration and transport. I then discuss the extension of such a work to non-thermal emissions in other wavebands.
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