A search for ionized jets towards massive young stellar objects
S. J. D. Purser, S. L. Lumsden, M. G. Hoare, J. S. Urquhart, N., Cunningham, C. R. Purcell, K. J. Brooks, G. Garay, A. E. G\'uzman, M. A., Voronkov

TL;DR
This study uses radio observations to identify and analyze ionized jets in massive young stellar objects, revealing similarities with low-mass jets and supporting disc-mediated accretion in massive star formation.
Contribution
It provides the first comprehensive radio survey of ionized jets in massive young stellar objects, demonstrating their properties and scaling relations with bolometric luminosity.
Findings
26 sources classified as ionized jets
Non-thermal lobes observed in 13 jets
Jet properties scale with bolometric luminosity
Abstract
Radio continuum observations using the Australia telescope compact array at 5.5, 9.0, 17.0 and 22.8 GHz have detected free-free emission associated with 45 of 49 massive young stellar objects and HII regions. Of these, 26 sources are classified as ionized jets (12 of which are candidates), 2 as ambiguous jets or disc winds, 1 as a disc-wind, 14 as HII regions and 2 were unable to be categorised. Classification as ionized jets is based upon morphology, radio flux and spectral index, in conjunction with previous observational results at other wavelengths. Radio-luminosity and momentum are found to scale with bolometric luminosity in the same way as low-mass jets, indicating a common mechanism for jet production across all masses. In 13 of the jets, we see associated non-thermal/optically-thin lobes resulting from shocks either internal to the jet and/or at working surfaces. Ten jets…
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