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Accepted for the ApJ Letters, June 24th 2004 Sub-arcsecond sub-mm continuum observations of Orion-KL

By H. Beuther, Q. Zhang, L. J. Greenhill, M. G. Reid, D. Wilner, E. Keto, D. Marrone, P. T. P. Ho, J. M. Moran, R. Rao, H. Shinnaga and S. -y. Liu


We present the first 865 µm continuum image with sub-arcsecond resolution obtained with the Submillimeter Array. These data resolve the Orion-KL region into the hot core, the nearby radio source I, the sub-mm counterpart to the infrared source n (radio source L), and new sub-mm continuum sources. The radio to submillimeter emission from source I may be modeled as either the result of proton-electron free-free emission that is optically thick to ∼ 100GHz plus dust emission that accounts for the majority of the submillimeter flux, or H − free-free emission that gives rise to a power-law spectrum with power-law index of ∼ 1.6. The latter model would indicate similar physical conditions as found in the inner circumstellar environment of Mira variable stars. Future sub-arcsecond observations at shorter sub-mm wavelengths should easily discriminate between these two possibilities. The sub-mm continuum emission toward source n can be interpreted in the framework of emission from an accretion disk

Year: 2004
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