Herschel/PACS spectroscopy of NGC 4418 and Arp 220: H2O, H218O, OH, 18OH, O I, HCN, and NH3

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Fig. 8

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Spectra around the wavelengths of relevant ¹⁸OH lines in NGC 4418 (upper profiles) and Arp 220 (lower profiles). Model predictions for NGC 4418 (C_core) with , and for Arp 220 with are also shown. For the ¹⁸OH 120 μm doublet, the contributions by the different components in Arp 220 (see Fig. 6) are indicated; red denotes the total of all components.

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