Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....67..409s&link_type=abstract
Astronomy and Astrophysics, vol. 67, no. 3, July 1978, p. 409-420.
Astronomy and Astrophysics
Astrophysics
10
Magnetohydrodynamic Waves, Supernova Remnants, Wave Fronts, Wave Interaction, Clouds, Filaments, Interstellar Matter, Propagation Modes, Reflected Waves, Topology
Scientific paper
Expanding shells of old supernova remnants (SNR) are simulated by magnetohydrodynamic (MHD) wave fronts. We examine the three-dimensional behavior of the shells interacting with the inhomogeneous interstellar medium and clouds. The wave front undergoes strong refraction and reflection by the clouds. Subsequent focusing of the waves produces filamentary structures and bright patches, when the cloud size is much smaller than the shell radius. If the cloud size is comparable with or greater than the shell radius, the SNR becomes greatly deformed from a sphere. Morphological features of a typical old SNR, S 147, are fit reasonably well by a model which postulates interaction with several interstellar clouds of radii 8-12 pc.
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