Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21713003h&link_type=abstract
American Astronomical Society, AAS Meeting #217, #130.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Since their discovery in 1912, it has been a problem to identify the main sources of Galactic cosmic rays. This is an important issue, as accelerating these particles requires an enormous amount of energy: they contribute one third to the energy density of the inter stellar medium. For decades, the main candidates for accelerating Galactic cosmic rays have been the shocks of supernova remnants. There is plenty evidence for highly energetic cosmic-ray electrons at the shock fronts of supernova remnants. However, 99% of the cosmic-ray energy is contained in cosmic-ray protons.
We measured the total cosmic-ray acceleration efficiency by combining shock velocities with proton temperatures behind the shock fronts of the young supernova remnants RCW 86 and SNR 0509-67.5. We show that the temperatures are lower than expected from the shock velocities. From this study, we conclude that over 10% of the pressure behind the shock is contributed by cosmic rays.
Helder Eveline A.
Vink Jacco
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