Other
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105..374h&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 686, p. 374-378.
Other
16
Carbon Monoxide, Galactic Structure, Irregular Galaxies, Astronomical Spectroscopy, Emission Spectra, Star Formation
Scientific paper
We report upper limits on the (C-12)O J = 1 - 0 and 2 - 1 line emission for several positions in five Magellanic irregular and amorphous galaxies. The positions in three of the galaxies were chosen because they were peaks in H I interferometer maps. The galactic centers were observed for the other two. The upper limits on the emission are below (sometimes far below) what was expected based upon the empirical relationship between CO and IRAS 100-micron flux, suggesting that one or more of the following is (are) true: (1) much of the molecular gas has been used up during the star formation process, (2) the H2 has been dissociated by the intense UV radiation produced by the massive stars, (3) that the CO emitting surfaces of the molecular clouds are smaller due to the effects of dissociation of the intense UV radiation, or (4) that CO is not tracing the H2. These results, when combined with other work, suggest that molecular gas is a relatively transient phenomenon in dwarf galaxies, unlike spirals.
Hunter Deidre Ann
Sage Leslie
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