Luigi Tibaldo (KIPAC/SLAC): "A tale of cosmic rays narrated in gamma rays by Fermi"

lundi 14 avr. 2014, 14:00 → 15:00 Europe/Paris

1222-RC/SB-08 (LPNHE)

Because cosmic rays are charged particles scrambled by magnetic fields, combining direct measurements with other observations is crucial to understanding their origin and propagation. As energetic particles traverse matter and electromagnetic fields, they leave marks in the form of neutral interaction products. Among those, gamma rays trace interactions of nuclei that inelastically collide with interstellar gas, as well as of leptons that undergo bremsstrahlung and inverse-Compton scattering. Data being collected by the Fermi Gamma-ray Space Telescope are therefore telling us the story of cosmic rays. They are shedding new light on the many facets of particle acceleration in supernova remnants, on the early propagation of cosmic rays in massive-star forming regions, and on the large-scale propagation in the parent galaxies, hence bringing us ever closer to solving the cosmic-ray mystery.

Transparents tibaldo_LPNHE2014_v1.pdf