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VLBI observations of H2O masers towards high-mass Young Stellar Objects

Date Issued
2004
Author(s)
Goddi, C.
•
Abstract
We have conducted multi-epoch VLBI observations of the 22.2 GHz water masers towards three massive star forming regions (Sh 2-255 IR, WB89-234, AFGL 5142). For the maser fetures persistent in time, accurate values of the proper motions are derived. The comparison of the VLBI 22.2 GHz maps with the highest-resolution images of the sources Sh 2-255 IR and WB89-234 in several thermal tracers, may suggest that the water masers are most likely tracing the inner portion of the molecular outflows detected at much larger-scales. This interpretation is also confirmed by the results obtained by fitting to the data two different kinematical models, a Keplerian disk and a conical outflow.

Towards AFGL 5142 the water maser features are distributed in two different structures, whose axes are nearly perpendicular to each other. A possible interpretation is that the maser emission is tracing the disk/jet system nearby the forming YSO.

Coverage
Proceedings of the 7th VLBI Network on New Developments in VLBI Science and Technology
All editors
Bachiller, R.; Colomer, F.; Desmurs, J.-F.; de Vicente, P.
Start page
191
Conferenece
7th Symposium of the European VLBI Network on New Developments in VLBI Science and Technology.
Conferenece place
Toledo (Spain)
Conferenece date
October 12-15, 2004.
Uri
Ads BibCode
2004evn..conf..191G
Rights
open.access
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