Dynamical effects of Cosmic Rays in the interstellar medium

Details Dynamical effects of Cosmic Rays in the interstellar medium Dynamical effects of Cosmic Rays in the interstellar medium

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf..323m&link_type=abstract

"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes

Astronomy and Astrophysics

Astrophysics

Scientific paper

We give a short review of the connection between cosmic-rays (CRs) and the macroscopic structures in the interstellar medium (ISM). Two complementary energy regimes provide information on the interaction of CRs with the interstellar matter. The low energy CR (LECRs) with E ≤ GeV usually dominate the energy density of the CR spectrum. The LECRs are of prime importance in the chemistry of diffuse and dark clouds. They can be investigated in the X and gamma-ray wavebands through the spallation reactions and iron fluorescence radiation. The highest energies (HECRs) with E ≫ GeV probe the ISM medium over larger scales. The recent detection of gamma radiation from the galactic ridge by the telescope Tcherenkov H.E.S.S. shows a non uniform CR distribution with respect to the local measurements. Some sites where the CRs should have a dynamical effect are finally briefly discussed.

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