We present sensitive 1.3 cm radio continuum observations of the region OMC1 South ( OMC-1S ) in Orion using the Very Large Array in its B configuration .
We detect eleven radio sources clustered in a 30 { { } ^ { \prime \prime } } \times 30 { { } ^ { \prime \prime } } region , of which only three had been detected previously at radio wavelengths in deep 3.6 cm observations .
The eight new radio sources are compact ( \theta _ { s } \leq 0 \hbox to 0.0 pt { . } { { } ^ { \prime \prime } } 1 ) and we set lower limits to their spectral indices , \alpha > 0.8 \pm 0.3 ( with S _ { \nu } \propto \nu ^ { \alpha } ) , that suggest that they may be optically-thick H II regions .
However , one of the new sources exhibits significant circular polarization , indicating that gyrosynchrotron emission with large positive spectral indices may be an alternative explanation .
Furthermore , we find that four other sources are associated with infrared sources of low bolometric luminosity that can not drive an H II region .
Finally , two of the sources previously detected at 3.6-cm are angularly resolved in the 1.3 cm image and their major axes have position angles that align well with large scale outflows emanating from OMC-1S .
The radio source 143-353 has a major axis with a position angle consistent with those of the HH 202 and HH 528 flows , while the radio source 134-411 has a major axis with a position angle consistent with that of the low-velocity molecular outflow associated with the far-infrared source FIR 4 .