Other
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..256m&link_type=abstract
Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at
Other
Scientific paper
With the advent of new correlators and dedicated arrays, spectral line VLBI is entering its ascendancy as a probe of a variety of interesting astrophysical environments. One of the most interesting environments where spectroscopic VLBI techniques are valuable is the regions directly coincident with forming stars. In these sources water maser emission is observed when the outflowing jets of material interact with the surrounding medium. Observations of these water masers dramatically reveal the innermost regions of the star formation process at or below the 1-AU scale. We have found that the water masers clearly trace the jets at these scales. The masers show proper motions on the order of 60 to 100 km/s and form within a few AU of the exciting protostar. By observing the distributions and motions of the water masers associated with these objects we may be able to address in greater detail the collimation mechanism of the jets seen in these objects. We will provide an overview of multi-epoch observations obtained so far by our group and other researchers on the water masers in the sources IRAS16293-2422, IRAS05413-0104 (HH212) and S106FIR. New observations of three sources associated with the NGC 1333 star forming region; IRAS4A, 4B and SVS13 will also be presented.
Alwyn Wootten H.
Claussen Mark
Marvel Kevin B.
Wilking Burkhard
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