Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sf2a.conf..177m&link_type=abstract
SF2A-2010: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics. Eds.: S. Boissier, M. Heydari-
Astronomy and Astrophysics
Astrophysics
Cosmic Rays, Galaxies: Milky Way, Lmc, Smc, M82, Ngc253, Gamma Rays: Galaxies
Scientific paper
Every star-forming galaxy is thought to host a large-scale population of cosmic rays accelerated in the various astrophysical shocks that accompany the evolution of massive stars from the main sequence to the compact remnant. As they propagate in the interstellar medium, these non-thermal particles radiate in the radio and gamma-ray bands through interactions with matter and radiation fields. The resulting diffuse glow bears the marks of the cosmic-ray acceleration and transport processes, and the comparison of the emissions from different galactic systems thus can provide insights into both aspects of the cosmic-ray phenomenon. Such a study was however not possible before the LAT gamma-ray telescope onboard the Fermi satellite came into operation about two years ago. In this paper, we review the detections of some external star-forming systems achieved by the Fermi/LAT so far, and we emphasise how these observations hold potential for improving our understanding of galactic cosmic rays.
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