Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100.1915h&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 100, Dec. 1990, p. 1915-1926, 2067-2078.
Astronomy and Astrophysics
Astronomy
15
H Ii Regions, Infrared Imagery, Milky Way Galaxy, Molecular Clouds, Star Formation, Carbon Monoxide, Infrared Astronomy Satellite, Millimeter Waves
Scientific paper
CO maps of molecular clouds associated with 11 small Galactic H II regions are presented and compared with IR images obtained by IRAS. The molecular masses of the clouds are computed and compared with the masses of the stellar content. The mapped clouds have masses of 1000-60,000 solar and are typical of the more numerous, smaller Galactic molecular clouds. All of the clouds have recently made massive OB stars, and many have complex spatial and kinematic structures. The coincidence of IRAS sources and CO peaks suggests that many of the clouds have sites of star formation other than the optically visible H II region. Star-formation efficiencies are uncertain, with values for the clouds ranging from 0.02 to 0.6 with an average value of 0.2. There is no trend of the upper stellar mass limit with Galactic radius and with molecular cloud mass.
Hunter Deidre Ann
Thronson Harley A. Jr.
Wilton Charles
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