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We present a multiwavelength study of the extended green object, G12.42+0.50in this paper. The associated ionized, dust, and molecular components of thissource are studied in detail employing various observations at near-, mid- andfar-infrared, submillimeter and radio wavelengths. Radio continuum emissionmapped at 610 and 1390 MHz, using the Giant Meterwave Radio Telescope, India,advocates for a scenario of coexistence of an UC H II region and an ionizedthermal jet possibly powered by the massive young stellar object, IRAS18079-1756 with an estimated spectral type of B1 - B0.5. Shock-excited lines ofH2 and [FeII], as seen in the near-infrared spectra obtained with UKIRT-UIST,lend support to this picture. Cold dust emission shows a massive clump of mass1375 M{\sun} enveloping G12.42+0.50. Study of the molecular gas kinematicsusing the MALT90 and JCMT archival data unravels the presence of both infallactivity and large-scale outflow suggesting an early stage of massive starformation in G12.42+0.50. A network of filamentary features are also revealedmerging with the massive clump mimicking a hub-filament layout. Velocitystructure along these indicate bulk inflow motion.

Initial phases of high-mass star formation: A multiwavelength study towards the extended green object G12.42+0.50