Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-10-20
Astronomy and Astrophysics
Astrophysics
Invited review, to appear in the proceedings of "4th Heidelberg International Symposium on High Energy Gamma-Ray Astronomy 200
Scientific paper
10.1063/1.3076632
An overview is given of multiwavelength observations of young supernova remnants, with a focus on the observational signatures of efficient cosmic ray acceleration. Some of the effects that may be attributed to efficient cosmic ray acceleration are the radial magnetic fields in young supernova remnants, magnetic field amplification as determined with X-ray imaging spectroscopy, evidence for large post-shock compression factors, and low plasma temperatures, as measured with high resolution optical/UV/X-ray spectroscopy. Special emphasis is given to spectroscopy of post-shock plasma's, which offers an opportunity to directly measure the post-shock temperature. In the presence of efficient cosmic ray acceleration the post-shock temperatures are expected to be lower than according to standard equations for a strong shock. For a number of supernova remnants this seems indeed to be the case.
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