  Massive young stellar objects (MYSOs) have recently been shown to drive jets
whose particles can interact with either the magnetic fields of the jet or
ambient medium to emit non-thermal radiation. We report a search for
non-thermal radio emission from a sample of 15 MYSOs to establish the
prevalence of the emission in the objects. We used their spectra across the L-,
C- and Q-bands along with spectral index maps to characterise their emission.
We find that about 50% of the sources show evidence for non-thermal emission
with 40% showing clear non-thermal lobes, especially sources of higher
bolometric luminosity. The common or IRAS names of the sources that manifest
non-thermal lobes are; V645Cyg, IRAS 22134+5834, NGC 7538 IRS 9, IRAS
23262+640, AFGL 402d and AFGL 490. All the central cores of the sources are
thermal with corresponding mass-loss rates that lie in the range 3X10^{-7} to
7X10^{-6} solar masses per year. Given the presence of non-thermal lobes in
some of the sources and the evidence of non-thermal emission from some spectral
index maps, it seems that magnetic fields play a significant role in the jets
of massive protostars. Also noted is that some of the sources show evidence of
binarity and variability.
