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We present the results of a new study of the molecular gas associated with the ‘extended green object’ (EGO) G35.03+0.35. This object, very likely a massive young stellar object, is embedded in a molecular cloud at the border of an H  ii  region. The observations were performed with the Atacama Submillimeter Telescope Experiment in the  12 CO and  13 CO  J = 3–2, HCO +   J = 4–3 and CS  J = 7–6 lines with an angular resolution of about 22 arcsec. From the  12 CO  J = 3–2 line, we discovered outflowing activity of the massive young stellar object. We obtained a total mass and kinetic energy for the outflows of 30 and 3000 M ⊙  (km s −1 ) 2  (6 × 10 46  erg), respectively. We discovered an HCO +  and CS clump towards the EGO G35.03+0.35. The detection of these molecular species supports the presence of molecular outflows and a dense molecular envelope with temperatures and densities above 40 K and 6 × 10 6  cm −3 , respectively. Using public near‐ and mid‐infrared and submillimetre data, we investigated the spectral energy distribution confirming that EGO G35.03+0.35 is a massive young stellar object at its earliest evolutionary stage (i.e. a class I young stellar object). By analysing radio‐continuum archival data, we found three radio sources towards the object, suggesting the presence of several young stellar objects in the region. Our radio‐continuum analysis is consistent with the presence of at least one ultracompact H  ii  region and a hypercompact H  ii  region or a constant‐velocity ionized wind source.

Study of the dense molecular gas surrounding the ‘extended green object’ G35.03+0.35