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We present Submillimeter Array (SMA) observations toward the high-massstar-forming region IRAS 18566+0408. Observations at 1.3 mm continuum and inseveral molecular line transitions were performed in the compact (2."4 angularresolution) and very-extended (~0."4 angular resolution) configurations. Thecontinuum emission from the compact configuration shows a dust core of 150Msun, while the very-extended configuration reveals a dense (2.6 x 10^7 cm^-3)and compact (~4,000 AU) condensation of 8 Msun. We detect 31 moleculartransitions from 14 species including CO isotopologues, SO, CH3OH, OCS, andCH3CN. Using the different k-ladders of the CH3CN line, we derive a rotationaltemperature at the location of the continuum peak of 240 K. The 12CO(2-1),13CO(2-1), and SO(6_5-5_4) lines reveal a molecular outflow at PA ~135^ocentered at the continuum peak. The extended 12CO(2-1) emission has beenrecovered with the IRAM 30 m telescope observations. Using the combined dataset, we derive an outflow mass of 16.8 Msun. The chemically rich spectrum andthe high rotational temperature confirm that IRAS 18566+0408 is harboring a hotmolecular core. We find no clear velocity gradient that could suggest thepresence of a rotational disk-like structure, even at the high resolutionobservations obtained with the very-extended configuration.

SMA Observations of the Hot Molecular Core IRAS 18566+0408