Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...420l..21w&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 420, no. 1, p. L21-L24
Astronomy and Astrophysics
Astronomy
18
Carbon Monoxide, Dwarf Galaxies, Hydrogen, Molecular Clouds, Radio Astronomy, Radio Spectra, Ring Galaxies, Spiral Galaxies, Transition, Infrared Astronomy Satellite, Interstellar Gas, Radio Telescopes, Spectrometers
Scientific paper
We report the detection of the J = 2 goes to 1 (230 GHz) line of carbon monoxide in the polar rings of the galaxies NGC 2685 and NGC 4650A, and we use the results in a simple analysis of the composition of the neutral interstellar medium therein. Only 17%-35% of the gas mass of the NGC 4650A ring is provided by molecular clouds, perhaps consistent with the conventional picture of the origin of polar rings in the capture of a dwarf galaxy or tidal mass transfer from a spiral galaxy. The polar ring of NGC 2685, however, is quite rich in molecular matter, with an H2 mass greater than the neutral atomic hydrogen mass. Such a composition may be difficult to explain with the picture that applies to NGC 4650A.
Buchholz Leah M.
Guptill Matthew T.
Watson Dan M.
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