Proper motions and distances of H2O maser sources. I - The outflow in Orion-KL

Details Proper motions and distances of H2O maser sources. I - The outflow in Orion-KL Proper motions and distances of H2O maser sources. I - The outflow in Orion-KL

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244..884g&link_type=abstract

Astrophysical Journal, Part 1, vol. 244, Mar. 15, 1981, p. 884-902. NSF-supported research.

Astronomy and Astrophysics

Astrophysics

394

Interstellar Gas, Interstellar Masers, Molecular Clouds, Orion Nebula, Very Long Base Interferometry, Water Masers, Distance, Infrared Radiation, Spectrum Analysis, Stellar Evolution, Stellar Mass Ejection

Scientific paper

The measurement of relative proper motions of H2O maser features at 22 GHz with VLBI methods is reported. In the H2O source in Orion-KL, the transverse motions are typically a few milli-arcsec per year; these motions are interpreted as kinematic motions of compact cloudlets of masing gas. The data from Orion show a large-scale outflow of maser features at 18 km/s from a common origin located within 5 arcsec of the compact infrared source IRc2. It is suggested that all outflow phenomena observed in molecular lines with a velocity spread of about plus or minus 20 km/s are associated with the luminuous heavily obscured infrared source IRc2 and not with the BN object.

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