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We report observations of 6cm, 3.6cm, 1.3cm, and 7mm radio continuum,conducted with the Very Large Array towards IRAS18566+0408, one of the fewsources known to harbor H2CO 6cm maser emission. Our observations reveal thatthe emission is dominated by an ionized jet at cm wavelengths. Spitzer/IRACimages from GLIMPSE support this interpretation, given the presence of 4.5umexcess emission at approximately the same orientation as the cm continuum. The7mm emission is dominated by thermal dust from a flattened structure almostperpendicular to the ionized jet, thus, the 7mm emission appears to trace atorus associated with a young massive stellar object. The H2CO 6cm maser iscoincident with the center of the torus-like structure. Our observations ruleout radiative pumping via radio continuum as the excitation mechanism for theH2CO 6cm maser in IRAS18566+0408.

An H2CO 6cm Maser Pinpointing a Possible Circumstellar Torus in IRAS18566+0408