Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309..326d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 309, Oct. 1, 1986, p. 326-330.
Astronomy and Astrophysics
Astrophysics
206
Carbon Monoxide, Interstellar Matter, Mass Distribution, Molecular Clouds, Emission Spectra, Extragalactic Radio Sources, Galactic Structure
Scientific paper
The validity of integrated CO emission intensity as a tracer of molecular cloud mass in external galaxies is examined critically. By modeling extragalactic CO emission with an ensemble of independently emitting clouds, each of which obeys the virial theorem, it is demonstrated that, on average, there exists a linear relationship between integral CO intensity and the mass surface density of emitting cloud material lying within a radio telescope's antenna beam. Using molecular cloud parameters typical of the Milky Way, a ratio of mass surface density to integrated CO intensity is found which is within a factor of 2 of those frequently used to interpret extragalactic carbon monoxide observations.
Dickman Robert L.
Schloerb Peter F.
Snell Ronald L.
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