Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21115408g&link_type=abstract
American Astronomical Society, AAS Meeting #211, #154.08; Bulletin of the American Astronomical Society, Vol. 39, p.1007
Astronomy and Astrophysics
Astronomy
Scientific paper
Phase-reference VLBI observations of 22 GHz water and 6.7 GHz methanol masers were conducted toward two high-mass SFRs, AFGL 5142 and G24.78+0.08. In both sources, water and methanol masers emerge at similar positions and line-of-sight velocities, which suggests that a same YSO is responsible for the excitation of the two types of emission. Although associated with the same YSO, the two maser species appear to originate in different environments. In AFGL 5142 water masers trace expansion at the base of a protostellar jet, whilst methanol masers are more probably tracing infalling than outflowing gas. In G24.78+0.08, water masers trace a fast expanding shell surrounding a HC HII region driven by a strong stellar wind. Methanol masers are most likely emerging in a rotating toroid surrounding the HC HII region. These results give support to models of accretion and jet ejection related to the formation of high-mass stars.
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