Other
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...269..218s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 269, June 1, 1983, p. 218-228.
Other
8
Astronomical Spectroscopy, Supernova Remnants, Velocity Distribution, High Resolution, Image Processing, Microdensitometers, Nitrogen Ions, Oxygen Spectra, Radial Velocity, Shock Waves, Sulfur, Temperature Measurement, Turbulence
Scientific paper
Very high resolution spectroscopy of optical emission lines indicates that the velocity dispersions of knots in Vela X and Puppis A result primarily from turbulence within the emitting regions. Line-of-sight velocity dispersions (half-widths at half-maximum) for the observed knots in both remnants are about 20-30 km/s. In Vela X, these include thermal velocity dispersions of roughly 16 km/s for hydrogen and 4 km/s for nitrogen. The knots themselves move randomly relative to each other, with speeds up to 30 km/s in Vela X and between 30-80 km/s in Puppis A. Occasionally, diffuse components of the filaments are observed in Puppis A. These diffuse components have velocity dispersions between 55 and 80 km/s, but the relative contributions of turbulent and thermal motions to the dispersions are unknown. The results are compared with theory and previous observations. Direct photographs may be able to show if the forbidden O III knots are less spatially dispersed than the forbidden N II, forbidden S II, forbidden O II, and H I knots.
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