Physics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991anpcs..16..375b&link_type=abstract
Ann. Phys. (Paris) Colloq., Vol. 16, No. 4, p. 375 - 395
Physics
Supernovae: Shock Waves, Supernovae: Hydrodynamics, Supernova Remnants: Interstellar Matter
Scientific paper
The interactions of a supernova blast wave with the inhomogeneities of the interstellar medium have been observed both in the young supernova remnants, with ages ≡102yr, and in the middle-aged supernova remnants older than ≡104yr. Low mass supernovae produce remnants interacting with an interstellar medium unaffected by the prognitor star, in which the density inhomogeneities mainly appear in the form of clouds. The encounter of the supernova shock with a cloud affects the propagation of the main shock and compresses and accelerates the cloud itself. Massive stars, such as progenitors of the supernovae, reprocess the interstellar medium, either ionizing the interstellar gas or by adding mass and kinetic energy via stellar winds. The supernova shock will move in a stratified medium and the remnant may be "muffled" by the circumstellar material disposed around the progenitor. The author reviews the results of two-dimensional numerical hydrodynamics both in a cloudy and in a stratified medium comparing them with the observations in optical and X-ray bands for young (Cas A) and evolved remnants (Cygnus Loop).
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