Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...171..252r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 171, no. 1-2, Jan. 1987, p. 252-260. MOESC-supported research.
Astronomy and Astrophysics
Astrophysics
27
Carbon Monoxide, Emission Spectra, Molecular Clouds, Shock Fronts, Astronomical Maps, Astronomical Models, Astronomical Spectroscopy, H Ii Regions, Line Shape, Star Formation, Velocity Distribution
Scientific paper
A study is reported of M 17 (the Omega Nebula, NGC 6618), which is a bright H II region and area of active star formation. An area extending over about 9 x 12 arcmin of the molecular cloud has been mapped in the J=3-2 transition of CO. The CO emission is observed to come mainly from two bars which lie just outside the area of ionized gas. The most intense emission is from the area around the M 17 SW cloud core in the southwest bar. The spectra observed are complex, often showing considerable variation in line shape over small distances. The velocity structure of this region is interpreted as arising from an ensemble of molecular cloud fragments in addition to extended emission. There is an area of star formation to the east of the M 17 SW cloud core, close to the interface between the ionized gas and the molecular cloud.
Cronin T. S.
Gatley Ian
Griffin Matt J.
Hayashi Saeko Suzuki
Kaifu Norio
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