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http://hdl.handle.net/20.500.12386/32827
Title: | VLBI observations of H2O masers towards high-mass Young Stellar Objects | Authors: | Goddi, C. MOSCADELLI, Luca |
Issue Date: | 2004 | Volume: | Proceedings of the 7th VLBI Network on New Developments in VLBI Science and Technology | Editors: | Bachiller, R.; Colomer, F.; Desmurs, J.-F.; de Vicente, P. | First Page: | 191 | 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. <P />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. | Conference Name: | 7th Symposium of the European VLBI Network on New Developments in VLBI Science and Technology. | Conference Place: | Toledo (Spain) | Conference Date: | October 12-15, 2004. | URI: | http://hdl.handle.net/20.500.12386/32827 | Bibcode ADS: | 2004evn..conf..191G | Fulltext: | open |
Appears in Collections: | 3.01 Contributi in Atti di convegno |
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Goddi_2004.pdf | PDF editoriale | 407.84 kB | Adobe PDF | View/Open |
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