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We present the results of 12CO(J = 1-0) mapping observations toward fourinteracting galaxies in early and mid stages of the interaction to understandthe behavior of molecular gas in galaxy-galaxy interaction. The observationswere carried out using the 45-m telescope at Nobeyama Radio Observatory (NRO).We compared our CO total flux to those previously obtained with single-dishobservations and found that there are no discrepancy between them. Applying atypical CO-H2 conversion factor, all constituent galaxies have molecular gasmass more than 10^9 M_sun. Comparisons to HI, Ks and tracers of SF such asHalpha, FUV, 8 um and 24 um revealed that the distribution of molecular gas ininteracting galaxies in the early stage of the interaction differs from atomicgas, stars and star-forming regions. These differences are not explainedwithout the result of the interaction. Central concentration of molecular gasof interacting galaxies in the early stage of the interaction is lower thanthat of isolated galaxies, which suggests molecular gas is distributedoff-centre and/or extends in the beginning of the interaction.

Properties of Molecular Gas in Galaxies in Early and Mid Stage of the Interaction: I. Distribution of Molecular Gas