Sub-Arcsecond Sub-MM Continuum Observations of Orion-KL.

Beuther, H. ; Zhang, Q. ; Green hill, L. J. ; Reid, M. G.

Technical Information Center Oak Ridge Tennessee

关键词: Imaging technique;    Stars;    Early stars;    Star formation;    Image resolution;   

RP-ID  :  DE2004827013

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

We present the first 865 (micro)m 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 (approx) 100 GHz plus dust emission that accounts for the majority of the submillimeter flux, or H(sup -) free-free emission that gives rise to a power-law spectrum with power-law index of (approx) 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.