Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...288..142r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 288, Jan. 1, 1985, p. 142-147. Research supported by the Natural Sciences a
Astronomy and Astrophysics
Astrophysics
30
H Ii Regions, Nebulae, Radial Velocity, Turbulence, Energy Transfer, H Alpha Line, Histograms, Velocity Distribution
Scientific paper
Close to 41,000 H-alpha radial velocities have been measured across most of the evolved H II region S142 (theta = 25 arcmin), allowing a systematic study of velocity fluctuations. Using grids of different mesh size to subdivide the H II region, the mean velocity dispersion, sigma, is found to be dependent on mesh size L. A well-defined correlation in the form of a power law sigma = L exp 0.30 is found. Because of ambiguous interpretation of this result in terms of turbulence, the structure function, B, which tests for velocity correlation at all scales has also been calculated. The structure function does not approach zero for r = 3 arcsec-90 arcsec. A brief qualitative analysis is attempted in terms of a turbulent energy cascade in a supersonic and compressible fluid. Kelvin-Helmholtz instabilities are suggested for the generation and maintenance of nebular turbulence.
Joncas Gilles
ROY Jean-Rene
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