Other
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...240..455e&link_type=abstract
Astrophysical Journal, Part 1, vol. 240, Sept. 1, 1980, p. 455-463.
Other
68
Abundance, Carbon Monoxide, Galactic Structure, Magellanic Clouds, Spiral Galaxies, Brightness, Galactic Nuclei, Galactic Radiation, H Ii Regions, Interstellar Gas
Scientific paper
CO emission has been sought in 52 directions toward six irregular, Magellanic-type galaxies, with null results at a typical detection limit of 0.04 K for a line width of 10 km/s. The positions searched correspond to those of bright OB star clusters, H II regions, H I peaks, and dark clouds. In two cases, one-third of the optical galaxy was covered by the observations. CO has been detected at 2.6 mm toward the nucleus of the low-mass SA(s)dm galaxy NGC 7793. The results imply that the mean surface brightness of CO emission in Magellanic irregulars is less than that of the Galaxy and other spirals which have been studied. Two categories of explanations for this are discussed, including (1) those based on a lower heating rate for interstellar clouds in irregulars, and thus a lower CO temperature, and (2) those based on a lower CO abundance.
Elmegreen Bruce G.
Elmegreen Debra Meloy
Morris Marita
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