Using VLBI to Probe the Orion KL Outflow on AU Scales

We present the first contemporaneous 43 and 86 GHz VLBI images of the v = 1, J = 2 right arrow 1 and J = 1 right arrow 0 SiO masers in the Orion KL nebula. Both maser species exhibit the same general morphology of earlier J = 1 right arrow 0 maser images, which appear to trace the edges of a bipolar...

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Published in:The Astrophysical journal 2004-05, Vol.607 (1), p.361-368
Main Authors: Doeleman, Sheperd S, Lonsdale, Colin J, Kondratko, Paul T, Predmore, C. Read
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Language:English
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description We present the first contemporaneous 43 and 86 GHz VLBI images of the v = 1, J = 2 right arrow 1 and J = 1 right arrow 0 SiO masers in the Orion KL nebula. Both maser species exhibit the same general morphology of earlier J = 1 right arrow 0 maser images, which appear to trace the edges of a bipolar conical outflow. Surprisingly, the J = 2 right arrow 1 masers form farther from the central protostar than the J = 1 right arrow 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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