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We present Submillimeter Array observations of the massive star-formingregion IRAS 20126+4104 in the millimeter continuum and in several molecularline transitions. With the SMA data, we have detected nine moleculartransitions, including DCN, CH3OH, H2CO, and HC3N molecules, and imaged eachmolecular line. From the 1.3 mm continuum emission a compact millimeter sourceis revealed, which is also associated with H2O, OH, and CH3OH masers. Using arotation temperature diagram (RTD), we derive that the rotational temperatureand the column density of CH3OH are 200 K and 3.7\times 1017 cm-2,respectively. The calculated results and analysis further indicate that a hotcore coincides with IRAS 20126+4104. The position-velocity diagrams of H2CO3(0,3)-2(0,2) and HC3N 25-24 clearly present Keplerian rotation. Moreover, H2CO3(0,3)-2(0,2) is found to trace the disk rotation for the first time.

Properties and Keplerian Rotation of the Hot Core IRAS 20126+4104