Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...307..649j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 307, Aug. 15, 1986, p. 649-658. Research supported by the Ministere de l'Ed
Astronomy and Astrophysics
Astrophysics
23
H Alpha Line, Molecular Clouds, Nebulae, Radial Velocity, Velocity Distribution, Astronomical Maps, Gas Dynamics, H Ii Regions, Histograms, Ionized Gases
Scientific paper
Using a Fabry-Perot camera, 9054 H-alpha radial velocities were measured across the H II region M 17. The mean v(LSR) = 18.6 + or - 0.1 km/s, which is 1.4 km/s blueshifted with respect to the mean velocity of the associated molecular cloud M 17 SW. The dispersion of the velocity histogram is slightly skewed to the blue. A gradient in radial velocity is observed from west to east, with the most blueshifted velocities appearing closest to the molecular cloud. The velocity field can be explained as a flow of ionized gas approximatively in the plane of the sky. There is a relation between random velocity and size, with velocity fluctuations increasing as some power of size; the power index depends on the sampling method of the velocity field. An interpretation of the relation is suggested in terms of turbulence, and a brief discussion of mechanisms for turbulent kinetic energy input is presented.
Joncas Gilles
ROY Jean-Rene
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