期刊
ASTROPHYSICAL JOURNAL
卷 607, 期 1, 页码 361-368出版社
IOP PUBLISHING LTD
DOI: 10.1086/383220
关键词
ISM : individual (Orion Kleinmann-Low); ISM : jets and outflows; masers; stars : formation; stars : winds, outflows
We present the first contemporaneous 43 and 86 GHz VLBI images of the v = 1, J = 2 --> 1 and J = 1 --> 0 SiO masers in the Orion KL nebula. Both maser species exhibit the same general morphology of earlier J = 1 --> 0 maser images, which appear to trace the edges of a bipolar conical outflow. Surprisingly, the J = 2 --> 1 masers form farther from the central protostar than the J = 1 --> 0 masers, a fact not readily explained by current SiO maser pumping models. The average magnitude of offsets between corresponding regions of the two masing transitions is approximately 14% of the total radial extent of the SiO maser emission. This offset indicates that each transition must trace different physical conditions.
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