Sub-arcsecond sub-mm continuum observations of Orion-KL

Abstract

We present the first 865 mu 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 ~100 GHz 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.

4 pages, 2 figures, 1 table, accepted for the Astrophysical Journal Letters

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• Resolving the Structure and Kinematics of the BN Object at $0\text{.}"2$ Resolution
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• An Infalling Torus of Molecular Gas Around the Ultra-Compact HII Region G28.20-0.05
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• The Small-Scale Physical Structure and Fragmentation Difference of Two Embedded Intermediate Mass Protostars in Orion
• Evolutionary Status of Brightest and Youngest Source in the Orion Molecular Cloud-3 Region
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• The Ionized Circumstellar Envelopes of Orion Source I and the Becklin Neugebauer Object
• Disk and outflow signatures in Orion-KL: The power of high-resolution thermal infrared spectroscopy
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• Evidence for dense gas heated by the explosion in Orion KL
• ALMA band 8 continuum emission from Orion Source I
• Mapping physical parameters in Orion KL at high spatial resolution
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