Abstract
We have extensively mapped the nuclear molecular bar of the nearby, face-on galaxy, IC 342, in 12 CO(J=3→2) using the JCMT. The emission is centrally peaked with a weaker maximum to the north, and there is evidence for both circular and noncircular motions in this region. A comparison of the CO(J=3→2)/CO(J=2→1) and CO(J=2→1)/CO(J=1→0) line ratios from both the JCMT and IRAM telescopes, together with a large velocity gradient model, shows that the emission is generally due to warm gas of mean density 2×10 3 cm −3 , and moderate optical thickness
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