February 20, 16:00 Aula Magna
Stefano Gabici (APC, Universite Paris Diderot)
One of the most important questions still unsolved in high energy astrophysics is: where do cosmic rays come from? Cos- mic rays can interact with matter and radiation and generate gamma rays. For this reason gamma ray astronomy is believed to be one of the most powerful tools to study cosmic rays and solve the problem of their origin. I will briefly discuss the ac- celeration of cosmic rays and the related gamma ray emission in different astrophysical systems, from galactic supernova rem- nants, believed to be the main sources of cosmic rays, to clusters of galaxies, which are possibly the largest cosmic ray accelera- tors in the Universe.