The Massachusetts Stony Brook galactic plane CO survey - Disk and spiral arm molecular cloud populations

Details The Massachusetts Stony Brook galactic plane CO survey - Disk and spiral arm molecular cloud populations The Massachusetts Stony Brook galactic plane CO survey - Disk and spiral arm molecular cloud populations

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...292l..19s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 292, May 1, 1985, p. L19-L24.

Astronomy and Astrophysics

Astrophysics

78

Carbon Monoxide, Interstellar Gas, Line Spectra, Milky Way Galaxy, Molecular Clouds, Molecular Spectra, Disk Galaxies, H Ii Regions, Histograms, Signal To Noise Ratios, Spiral Galaxies

Scientific paper

A preliminary analysis of a new high-resolution CO survey of the galactic disk is presented, which can detect and measure essentially all molecular clouds and cloud components in the inner Galaxy with size greater than 10 pc. In the region of l between 20 and 50 deg approximately 2000 emission centers are identified. Two populations which separate according to temperature are found. The disk population of cold molecular cores contains about three-quarters of the total number of cores, is not confined to any large-scale pattern in longitude-velocity space, and must be widespread in the Galaxy both in and out of spiral arms. The spiral arm population of warm molecular cores contains about one-quarter of the population with one-half of the emission and is very closely associated with radio H II regions. Between longitudes 20 and 50 deg their radial distribution shows two peaks at R = 5 and 7.5 kpc. The warm molecular cloud cores have a nonaxisymmetric galactic distribution, occur in clusters, and are confined to restricted regions and patterns in longitude-velocity space and in the galactic disk.

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