Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...205...41a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 205, no. 1-2, Oct. 1988, p. 41-46.
Astronomy and Astrophysics
Astrophysics
53
Carbon Monoxide, Compact Galaxies, Irregular Galaxies, Metallicity, Molecular Spectra, Spiral Galaxies, Dwarf Galaxies, H I Regions, Interstellar Matter, Magellanic Clouds
Scientific paper
The results of a search for CO emission in twelve blue compact galaxies made with the IRAM 30 m telescope are presented. None of them was detected; the upper limits to the CO luminosities of these objects are about eight times lower than what was previously achieved. For an ensemble of spiral galaxies and giant irregulars detected in CO, a correlation is found between the ratio of the CO luminosity over the H I mass and the average metallicity of the galaxy. Thus, metal-poor galaxies are expected to be less bright in CO. It is suggested that the low CO brightness of dwarf galaxies is mainly due to a CO abundance deficiency, combined to optically thin CO emission.
Arnault Philippe
Casoli Fabienne
Combes François
Kunth Daniel
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