Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..743w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 15, 1989, p. 743-749.
Astronomy and Astrophysics
Astrophysics
48
Carbon Monoxide, Galactic Nuclei, Gas Composition, Interstellar Gas, Molecular Gases, Spiral Galaxies, Hydrogen, Milky Way Galaxy, Molecular Clouds, Spectral Emission
Scientific paper
The nearby Sc galaxy M33 has been mapped at half-beamwidth spacing out to a 3.5 arcmin radius in the CO J = 1-0 line using the NRAO 12 m telescope. The map reveals seven large-scale features with sizes of 200-400 pc, and in several cases they are associated with spiral arms. The masses of these structures are insufficient to gravitationally or tidally bind them given their measured sizes and velocity dispersions, and distances from the center of M33. The total mass of molecular hydrogen in the region mapped is 3.4 x 10 to the 7th solar, roughly twice the mass in atomic hydrogen. Within a radius of 800 pc, no evidence is seen for an exponential decrease in the azimuthally averaged molecular hydrogen column density. The rotation curve obtained from the molecular gas agrees well with previous observations, yielding a disk mass of 5 x 10 to the 8th solar, out to a radius of 800 pc and a molecular gas mass total mass ratio of 4 percent.
Scoville Nick
Wilson Christine Diana
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