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Turbulent and Ordered Motions in HII Regions

Published online by Cambridge University Press:  12 April 2016

G. Courtès
G. Courtès*
Affiliation:
Laboratoire d’Astronomie Spatiale, CNRS - Trav. du Siphon - 13012 Marseille Observatoire de Marseille - 2, Place Le Verrier - 13004 Marseille (France)

Summary

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The Fill regions morphology have suggested, from the beginning of this century, the evidence of internal motions, very few gas radial velocities (RV) on the brightest “nebulae” had been obtained, because of obvious technical difficulties. The modern Fabry-Perot interferometers and the new integral Field Spectrograph provide abundant RV fields at various scales in the interstellar gas. New ways in imagery, owing to these new instruments, lead to a better analyse of both, the velocities field and their precise morphology free of stellar, dusty, and non thermal continua. The richness and the guallty of RV data, a better understanding of the expansion phenomena authorize again a rebirth of the turbulence observations of the ionized interstellar gas.

Keywords

Hll regionsIonized gas kinematicsturbulenceImaging spectrography
Type
I. Molecular Clouds, Star Formation And HII Regions
Information
International Astronomical Union Colloquium , Volume 120: Structure and Dynamics of the Interstellar Medium , 1989 , pp. 80 - 95
Copyright
Copyright © Springer-Verlag 1989

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