We present the first detection of CS in the Antennae galaxies toward the NGC 4038 nucleus, as well as the first detections of two high- J (5-4 and 7-6) CS lines in the center of M82. The CS(7-6) line in M82 shows a profile that is surprisingly different from those of other low- J CS transitions we observed. This implies the presence of a separate, denser and warmer molecular gas component. The derived physical properties and the likely location of the CS(7-6) emission suggest an association with the supershell in the center of M82.
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Bayet et al. (2008) studied this question.
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