What Lurks in ULIRGs ? — Probing the Chemistry and Excitation of Molecular Gas in the Nuclei of Arp 220 and NGC 6240


We have imaged the dense star-forming regions of Arp 220 and NGC 6240 in the 3 mm band transitions of CO, HCN, HCO, HNC, and CS at 0 5–0 8 resolution using CARMA. Our data set images all these lines at similar resolutions and high sensitivity, and can be used to derive line ratios of faint high excitation lines. In both the nuclei of Arp 220, the HCN/HNC… (More)

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