Zinchenko, I. I.I. I.ZinchenkoDewangan, L. K.L. K.DewanganBaug, T.T.BaugOjha, D. K.D. K.OjhaBhadari, N. K.N. K.Bhadari2025-08-312025-08-312021-09-0110.1093/mnrasl/slab0702-s2.0-85112194795http://repository.iitgn.ac.in/handle/IITG2025/25326We report the discovery of a very dense jet-like fast molecular outflow surrounded by a wide-angle wind in a massive young stellar object (MYSO) G18.88MME (stellar mass ∼8 M⊙) powering an extended green object G18.89-0.47. Four cores MM1-4 are identified in the Atacama Large Millimeter/submillimeter Array (ALMA) 1.3 mm continuum map (resolution ${\sim} 0.8\, \mathrm { arcsec}$) towards G18.88MME, and are seen at the centre of the emission structure (extent ∼0.3 pc × 0.2 pc) detected in the ALMA map. G18.88MME is embedded in the core MM1 (mass ∼13-18 M⊙), where no radio continuum emission is detected. The molecular outflow centred at MM1 is investigated in the SiO(5-4), HC3N(24-23) and 13CO(2-1) lines. The detection of HC3N in the outflow is rare in MYSOs and indicates its very high density. The position-velocity diagrams display a fast narrow outflow (extent ∼28 000 AU) and a slower wide-angle more extended outflow towards MM1, and both of these components show a transverse velocity gradient indicative of a possible rotation. All these observed features together make G18.88MME as a unique object for studying the unification of the jet-driven and wind-driven scenarios of molecular outflows in MYSOs.falseH ii regions | individual object: SDC18.888-0.476 | ISM: clouds | ISM: jets and outflows | stars: formation | stars: pre-main-sequenceArticlehttps://arxiv.org/pdf/2106.0962617453933L45-L491 September 202142WOS:000709445900010