Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...360..663m&link_type=abstract
Astronomy and Astrophysics, Vol. 360, p.663-670
Astronomy and Astrophysics
Astrophysics
35
Masers, Ism: Individual Objects: Iras 20126+4104, Ism: Jets And Outflows, Radio Lines: Ism
Scientific paper
We present VLBA observations of the H2O masers towards IRAS 20126+4104, a high-mass young stellar object which is believed to be associated with a rotating disk and a bipolar outflow/jet system collimated along the disk axis. A model fit to the positions and velocities of the maser spots demonstrates that these could arise on a conical surface at the interface between the jet and the surrounding molecular gas. The masers expand from a common centre which coincides, within the uncertainties, with the position of the embedded young stellar object: the expansion velocity is less than that measured on a much larger scale in the SiO(2-1) line and this indicates that the jet is sensitively braked close to its origin by the interaction with the surrounding medium. Based on observations carried out with the Very Large Baseline Array. The VLBA is a facility of the NRAO, which is operated by Associated Universities, Inc., under contract with the NSF.
Cesaroni Riccardo
Moscadelli Luca
Rioja Maria J.
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