A Disk/outflow System around the High-mass Protostar IRAS 20126+4104

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Disk, Outflow, Protostar, High-Mass, Iras 20126+4104

Scientific paper

We present images of a disk/outflow system around a high-mass protostar IRAS 20126+4104. In the NH3 (1,1) and (2,2) lines, we have resolved a flattened disk-like structure (6'' x 3'' or 10000 x 5000 AU). The disk rotates faster toward the center, consistent with the Keplerian motion. In the direction roughly perpendicular to the disk, there exists a warm bipolar CO (7-6) outflow and the shock excited NH3 (3,3). The CO (7-6) outflow is much more compact and appears in a different orientation from the arcminute-scale north-south flow seen in the CO (2-1). Since most of the high-mass stars are formed in cluster environment and are located at kiloparsec distances, sensitive and high resolution observations of high density and highly excited molecular transitions are crucial to pinpoint the massive objects. Designed to have those capabilities, ALMA will make a significant contribution to the understanding of the protostellar environment of high-mass stars.

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