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We used the Nobeyama 45-m telescope to conduct a spectral line survey in the3-mm band (85.1-98.4 GHz) toward one of the nearest galaxies with activegalactic nucleus NGC 1068 and the prototypical starburst galaxy NGC 253. Thebeam size of this telescope is ~18", which was sufficient to spatially separatethe nuclear molecular emission from the emission of the circumnuclear starburstregion in NGC 1068. We detected rotational transitions of C2H, cyclic-C3H2, andH13CN in NGC 1068. These are detections of carbon-chain and carbon-ringmolecules in NGC 1068. In addition, the C2H N = 1-0 lines were detected in NGC253. The column densities of C2H were determined to be 3.4 x 10^15 cm^-2 in NGC1068 and 1.8 x 10^15 cm^-2 in NGC 253. The column densities of cyclic-C3H2 weredetermined to be 1.7 x 10^13 cm^-2 in NGC 1068 and 4.4 x 10^13 cm^-2 in NGC253. We calculated the abundances of these molecules relative to CS for bothNGC 1068 and NGC 253, and found that there were no significant differences inthe abundances between the two galaxies. This result suggests that the basiccarbon-containing molecules are either insusceptible to AGN, or are tracingcold (T_rot ~10 K) molecular gas rather than X-ray irradiated hot gas.

Detections of C2H, cyclic-C3H2, and H13CN in NGC 1068