Colafrancesco, SergioSergioColafrancesco2020-09-172020-09-172009-01-01https://hdl.handle.net/20.500.13025/1515International Journal of Modern Physics D, Volume 18, Issue 10, pp. 1541-1544 (2009).We discuss the relevance of gamma-ray observations of galaxy clusters, to unveil several issues that are relevant for Cosmology and Astro-Particle Physics of cosmic structures the nature of Dark Matter, the origin of cosmic rays and the impact of black holes.Galaxy clustershigh-energy sourcescosmic raysdark matterblack holes10.1142/S0218271809015394http://adsabs.harvard.edu/abs/2009IJMPD..18.1541C2009IJMPD..18.1541C