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We report an observational study of the giant molecular cloud (GMC)associated with the Galactic infrared ring-like structure N35 and two nearbyHII regions G024.392+00.072 (HII region A) and G024.510-00.060 (HII region B),using the new CO J=1-0 data obtained as a part of the FOREST Unbiased GalacticPlane Imaging survey with the Nobeyama 45-m telescope (FUGIN) project at aspatial resolution of 21". Our CO data revealed that the GMC, with a totalmolecular mass of 2.1x10^6Mo, has two velocity components over ~10-15km/s. Themajority of molecular gas in the GMC is included in the lower-velocitycomponent (LVC) at ~110-114km/s, while the higher-velocity components (HVCs) at~118-126km/s consist of three smaller molecular clouds which are located nearthe three HII regions. The LVC and HVCs show spatially complementarydistributions along the line-of-sight, despite large velocity separations of~5-15km/s, and are connected in velocity by the CO emission with intermediateintensities. By comparing the observations with simulations, we discuss ascenario where collisions of the three HVCs with LVC at velocities of~10-15km/s can provide an interpretation of these two observational signatures.The intermediate velocity features between the LVC and HVCs can be understoodas broad bridge features, which indicate the turbulent motion of the gas at thecollision interfaces, while the spatially complementary distributions representthe cavities created in the LVC by the HVCs through the collisions. Our modelindicates that the three HII regions were formed after the onset of thecollisions, and it is therefore suggested that the high-mass star formation inthe GMC was triggered by the collisions.

Large-scale CO J=1-0 observations of the giant molecular cloud associated with the infrared ring N35 with the Nobeyama 45-m telescope