Multi-wavelength investigation of a massive toroidal candidate G24.78+0.08-A2

S. Vig1,2*, R. Cesaroni2, L. Testi2,3, M.T. Beltran2,4and C. Codella5
1Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India
2INAF-Osservatorio Astrofisico de Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
3ESO, Karl Schwarzschild str. 2, D-85748 Garching, Germany
4Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Spain
5INAF-Istituto di Radioastronomia, Sezione di Firenze, Largo E. Fermi 5, I-50125 Firenze, Italy

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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.

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