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Title:
CO observations around galactic longitude l=45 deg
Authors:
Israel, F. P.
Affiliation:
AA(NASA, Goddard Institute for Space Studies, New York, NY; European Space Research and Technology Centre, Noordwijk, Netherlands)
Publication:
Astrophysical Journal, Part 1, vol. 255, Apr. 15, 1982, p. 475-488. (ApJ Homepage)
Publication Date:
04/1982
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Carbon Monoxide, Galactic Structure, Molecular Clouds, Star Clusters, Astronomical Maps, B Stars, H Ii Regions, Milky Way Galaxy, Molecular Spectra, Noise Temperature, O Stars, Stellar Evolution
DOI:
10.1086/159848
Bibliographic Code:
1982ApJ...255..475I

Abstract

An area of about 1.5 deg x 2.0 deg, centered on l=45.5 deg and b=0.0 deg, was mapped in the (C-12)O line at intervals of one beamwidth. A total of 22 individual CO cloud complexes was identified; the brightest of these is associated with a massive H I cloud and the H II region complex G45.5+0.1. This object most likely represents a small OB star cluster in its early stages of development. All other H II regions in the area mapped are likewise associated with CO maxima. The survey results indicate a structure of the Sagittarius arm generally in agreement with that derived in earlier studies; they also indicate that the Galaxy as a whole contains of the order of 3500 molecular clouds larger than 10 pc in diameter.

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