The CO(2-1) to CO(1-0) line ratio drops by about 20 percent within 40 percent of the optical radius in barred galaxies while remaining roughly flat in unbarred galaxies.
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ALMA FACTS. II. Large Scale Variations in the 12CO(J=2-1) to 12CO(J=1-0) Line Ratio in Nearby Galaxies
The CO(2-1) to CO(1-0) line ratio drops by about 20 percent within 40 percent of the optical radius in barred galaxies while remaining roughly flat in unbarred galaxies.