Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294..231m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 294, July 1, 1985, p. 231-237.
Astronomy and Astrophysics
Astrophysics
64
Astronomical Spectroscopy, Molecular Clouds, Carbon Monoxide, H Ii Regions, Molecular Spectra, Radio Spectra, Stellar Evolution
Scientific paper
Observations of the J = 1 tends to 0 rotational transition of CO near the galactic plane in Monoceros (1 is approximately equal to 216 deg) reveal a molecular cloud with unusually low peak CO temperatures (less than 2 K) but wide lines (about 7 km/s) typical of much warmer clouds. At the assumed distance of 3 kpc, the cloud is large (250 x 100 pc), has a mass of 7-11 x 10 to the 5th solar masses, and is well removed from the galactic midplane (130 pc). Except for a possible H II region, all the signs of star formation usually shown by clouds of comparable mass are missing. The cloud, unlike cloud complexes of similar size, is a single, continuous object that apparently has not been torn apart by star formation. Clouds with such properties are rare in the Galaxy; only one or two similar objects have been found. The possibility that the cloud is young and not yet forming stars but will evolve into a typical cloud complex once star formation begins is discussed.
Maddalena Ronald J.
Thaddeus Patrick
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