Other
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...427..770w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 427, no. 2, p. 770-776
Other
2
Astronomical Models, Astronomical Spectroscopy, Electron Transitions, Interstellar Gas, Molecular Clouds, Molecular Gases, Molecular Spectra, Spiral Galaxies, Elliptical Galaxies, Gas Temperature, Kinematics, Velocity, Virgo Galactic Cluster
Scientific paper
This paper discusses observations of the J = 2-1 transition of (12)CO and (13)CO in the center of the Virgo Cluster SO galaxy NGC 4710. We use a simple model suggested by Wrobel & Kenney (1992) for the distribution of molecular gas to obtain a value for the intensity ratio of the transitions J = 2-1 and J = 1-0 which is similar to that in other SO galaxies and in spirals. Available information on the intensity ratio (12)CO/(13)CO suggests that the molecular gas is optically thick. This assumption is used to set limits on the gas temperature which are consistent with values typical of the Milky Way. The line profile observed at the center of the galaxy is complex, indicating the presence of significant structure within the source. This profile is well reproduced by adding a small number of clouds to the model. Although present data do not constrain the cloud properties, those clouds we employ are analogs of large Milky Way giant molecular clouds and contribute approximately 25% of the total mass of the molecular disk in the center of this galaxy. The model closely constrains the locations of clouds which produce structure at the red and blue ends of our line profile. Differences in the shapes of the profiles in the J = 1-0 and J = 2-1 transitions can be qualitatively explained by the lack of cloudy structure within part of the molecular disk northeast of the nucleus.
Mitchell George F.
Welch Gary A.
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