Abstract

We have searched for the CO(2..-->..1) line at 230 GHz in four galaxies and have detected it in two, IC 342 and M82. Comparison with data for the CO(1..-->..0) line in these galaxies shows that the molecular gas in IC 342 appears to be optically thick; that in M82, however, is of low optical depth. A comparison of the gas and stellar content of the central region of M82 suggests that much of the current star formation is taking place as high-mass stars.

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