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We have conducted a spectral line survey in the 3 mm and 2 mm bands towardtwo positions in a spiral arm of M51 (NGC 5194) with the IRAM 30 m telescope.In this survey, we have identified 13 molecular species, including CN, CCH,N2H+, HNCO, and CH3OH. Furthermore, 6 isotopologues of the major species havebeen detected. On the other hand, SiO, HC3N, CH3CN, and the deuterated speciessuch as DCN and DCO+ are not detected. The deuterium fractionation ratios areevaluated to be less than 0.8 % and 1.2 % for DCN/HCN and DCO+/HCO+,respectively. By comparing the results of the two positions with different starformation activities, we have found that the observed chemical compositions donot strongly depend on star formation activities. They seem to reflect achemical composition averaged over the 1-kpc scale region including many giantmolecular clouds. Among the detected molecules CN, CCH, and CH3OH are found tobe abundant. High abundances of CN, and CCH are consistent with the abovepicture of a wide spread distribution of molecules, because they can beproduced by photodissociation. On the other hand, it seems likely that CH3OH isliberated into the gas phase by shocks associated with large scale phenomenasuch as cloud-cloud collisions and/or by non-thermal desorption processes suchas photoevaporation due to cosmic-ray induced UV photons. The present resultdemonstrates a characteristic chemical composition of a giant molecular cloudcomplex in the spiral arm, which can be used as a standard reference forstudying chemistry in AGNs and starbursts.

Spectral Line Survey toward Spiral Arm of M51 in the 3 mm and 2 mm Bands