Carbon and oxygen isotope ratios in starburst galaxies: New data from NGC 253 and Mrk 231 and their implications

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Fig. 3

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C¹⁸O and ¹³CO J = 1 → 0 spectra from NGC 253 (lower panel) and Mrk 231 (upper panel) on a LSR V_LSR = 0 km s^-1 frequency scale. The spectra were smoothed to channel spacings of ~4.26 and ~60.0 km s^-1 (1.53 and 21.0 MHz), respectively. In the lower panel, the features at 109.8 and 110.27 GHz belong to HNCO J = 5 → 4 and CH₃CN J = 6 → 5.

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