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Title:
The shape of cooling filaments in old supernova remnants
Authors:
Smith, M. D.; Dickel, J. R.
Affiliation:
AA(Maryland, University, College Park, MD), AB(Illinois, University, Urbana, IL)
Publication:
Astrophysical Journal, Part 1, vol. 265, Feb. 1, 1983, p. 272-280. Research supported by the University of Maryland; (ApJ Homepage)
Publication Date:
02/1983
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
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
DOI:
10.1086/160672
Bibliographic Code:
1983ApJ...265..272S

Abstract

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.

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