Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.1504h&link_type=abstract
American Astronomical Society Meeting 210, #15.04; Bulletin of the American Astronomical Society, Vol. 39, p.113
Other
Scientific paper
We present preliminary results of our research on the non-thermal continuum emission of Cassiopeia A. Chandra discovered in 2001 thin non-thermal rims at a distance of 150'' to the center of Cas A. These rims can be associated with the forward shock and contain a surprisingly high magnetic field 0.1 - 0.5 mG. This feeds the thought that forward shocks of young shell-type supernova remnants are able to accelerate cosmic rays at least up to the knee, at 1015 keV. The Chandra image shows that not all non-thermal filaments are associated with the forward shock.
A natural question is whether these filaments are due to forward shock filaments projected to the interior of the remnant, or whether the filaments have another origin. We investigated this issue by employing a deprojection technique. Assuming spherical symmetry, we deproject the surface brightness into the intrinsic emissivity as a function of the radius. A suprising result of this deprojection is that we see the reverse shock coming up in the (deprojected) emissivity. This might indicate cosmic ray acceleration in the reverse shock.
Helder Eveline
Vink Jacco
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