Velocity dispersions of knots in the Cygnus Loop and IC 443

Details Velocity dispersions of knots in the Cygnus Loop and IC 443 Velocity dispersions of knots in the Cygnus Loop and IC 443

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...253..682s&link_type=abstract

Astrophysical Journal, Part 1, vol. 253, Feb. 15, 1982, p. 682-695.

Other

16

Astronomical Spectroscopy, Nebulae, Shock Wave Profiles, Supernova Remnants, Velocity Distribution, Astronomical Maps, Cygnus Constellation, Emission Spectra, Forbidden Bands, Hydrogen, Nitrogen, Oxygen, Turbulence

Scientific paper

Very high resolution spectroscopy of optical emission lines indicates that the velocity dispersions of knots in Cygnus Loop and IC 443 filaments result primarily from turbulence within the emitting regions. Line-of-sight velocity dispersions (half-widths at half-maximum) for the observed knots are on the order of 10-30 km/s, including associated thermal velocity dispersions of roughly 15 km/s for hydrogen, 6 km/s for oxygen, and 4 km/s for nitrogen. The knots themselves move randomly relative to each other with speeds of 10-30 km/s. Occasionally, diffuse components of the filaments are observed. These diffuse components have velocity dispersions between 60 and 85 km/s, but the relative contributions of turbulent and thermal motion to the dispersions are unkown.

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