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We present the results of NH3 (1,1), (2,2) and (3,3) and H2O masersimultaneous mapping observations toward the high-mass star-forming region W33with the Nobeyama 45-m radio telescope. W33 has six dust clumps and one ofwhich, W33 Main, is associated with a compact HII region. To investigatestar-forming feedback activity on its surroundings, the spatial distribution ofthe physical parameters was established. The distribution of the rotationaltemperature shows a systematic change from west to east in our observed region.The high-temperature region obtained in the region near W33 Main is consistentwith interaction between the compact HII region and the periphery moleculargas. The size of the interaction area is estimated to be approximately 1.25 pc.NH3 absorption features are detected toward the centre of the HII region.Interestingly, the absorption feature was detected only in the NH3 (1,1) and(2,2) transitions, with no absorption feature seen in the (3,3) transition.These complex profiles in NH3 are difficult to explain by a simple model andmay suggest that the gas distribution around the HII region is highlycomplicated.

monthly notices of the royal astronomical society

KAgoshima Galactic Object survey with Nobeyama 45-metre telescope by  Mapping in Ammonia lines (KAGONMA): Star formation feedback on dense  molecular gas in the W33 complex