Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ap%26ss.295..143a&link_type=abstract
Astrophysics and Space Science, Volume 295, Issue 1-2, pp. 143-153
Astronomy and Astrophysics
Astrophysics
1
Galaxies: Evolution, Galaxies: Ism, Galaxies: Starburst, Radio Lines: Galaxies, Radio Lines: Ism
Scientific paper
The molecular phase of the ISM constitutes the main source of fuel for the activity in starburst and AGNs. The physical conditions and chemical constitution of the molecular gas will change with, and respond to, the evolution of the activity. This paper includes a short discussion of the 12CO/13CO 1-0 line intensity ratio as a diagnostic tool of the molecular gas properties of luminous galaxies - paired with examples of high-resolution studies of how the line ratio varies within galaxies. A possible connection between the OH megamasers and galaxies with unusually high 12CO/13CO 1-0 line intensity ratios are also briefly discussed.
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