Abstract

G24.78+0.08 is a massive star-forming region where three large massive rotating structures (toroids), have been found around massive (proto)stars. We have carried out a detailed infrared and radio investigation of one of the toroidal candidates, G24-A2, using observations from VISIR-VLT and VLA and we speculate the scenario of the environment in the vicinity of the central exciting object(s). Compact mid-infrared emission is observed only from one source in the G24.78+0.08 region and this is likely to be associated with G24-A2. The radio spectral index (~1) points towards the possibility of this emission being from an ionised jet or an HII region with a density gradient. The NH3(2,2) emission from the main component is optically thick and appears self-absorbed at blue-shifted velocities. The velocity distributions of the NH3 lines can be explained by a motion which is a combination of rotation and expansion.