VIBRATIONAL GROUND-STATE SIO J=1-0 EMISSION IN ORION IRC2 IMAGED WITHTHE VLA

We have used the VLA to observe SiO(upsilon = 0, J = 1-0) at 43.4 GHz in the IRc2 region of Orion with 2'' resolution. Both a thermal compon ent and a maser component are detected, making IRc2 the only known sta r-forming region with an SiO vibrational ground-state maser. The maser emission is double peaked and is extended over similar to 900 AU with the same position angle as that observed for the upsilon = 1 masers. The velocity extent of the upsilon = 0 masers (30 km s(-1)) is similar to the upsilon = 1 SiO, OH, and H2O masers; we suggest that their mot ions are dominated by the outflow from IRc2 rather than a rotating dis k. The gradient in the thermal component is in the same sense as the C O outflow from IRc2 and appears to trace the interaction region betwee n the IRc2 wind and nearby dense molecular material to the south. The thermal SiO emission is clearly centered on IRc2 and not the hot core.