Abstract
The IRAM 30 m telescope has been used to detect CS(3-2) and (C-13)O(2-1) emission from Arp 220, the prototype infrared luminous galaxy. The CS luminosity of Arp 220 is half the (C-12)O luminosity of the Milky Way. Since CS emission traces gas 100 times denser than that traced by CO emission, Arp 220 contains much more molecular gas at high densities than normal galaxies. It is estimated that there are about 10 to the 10th solar masses of molecular gas at the high densities characteristic of star-forming molecular cloud cores. The existence of these clouds supports a starburst rather than an accretion disk-black hole origin for the 10 to the 12th solar luminosities emitted in the far-infrared. 26 refs.
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