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imaging spectrography

International Astronomical Union Colloquium (1)

International Astronomical Union (1)

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Turbulent and Ordered Motions in HII Regions
G. Courtès
Journal:

International Astronomical Union Colloquium / Volume 120 / 1989

Published online by Cambridge University Press:

12 April 2016, pp. 80-95

Print publication:

1989
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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.