Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..272s&link_type=abstract
Astrophysical Journal, Part 1, vol. 265, Feb. 1, 1983, p. 272-280. Research supported by the University of Maryland;
Astronomy and Astrophysics
Astrophysics
16
Density Wave Model, Magnetohydrodynamic Stability, Plasma Cooling, Shock Heating, Stellar Evolution, Supernova Remnants, Cygnus Constellation, Cylindrical Plasmas, Filaments, Galactic Structure, Plasma Jets, Plasma Layers, Radiative Heat Transfer, Thermal Instability
Scientific paper
The evolution of a filament in an old supernova remnant is investigated in two dimensions using analytical methods to determine its structure and stability and to show whether it collapses into a sheet or a cylinder. All parameters are assumed constant along the length of the feature. The cross section of the filament is found to flatten as it cools, and to degenerate into a thin sheet which is unstable to asymmetric warping disturbances. This probably leads to a number of parallel striations as the filament splits up, consistent with observations in the Cygnus Loop. The ratio of depth to width is typically 10:1, and so the feature may appear to be tubelike or a sheet, depending on perspective. The application to Vela and Puppis, IC 443, S 147, and CTB 1 is pointed out.
Dickel John R.
Smith Masson D.
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