Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.5315m&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #53.15; Bulletin of the American Astronomical Society, Vol. 31, p.1456
Astronomy and Astrophysics
Astronomy
Scientific paper
We present observations from the Very Large Array (VLA) in A and B configuration at 43 GHz and 22 GHz of the energetic star forming region W49N. Maser features in this source extend between velocities -260 km/s and +270 km/s. Positions and fluxes were calculated for 312 H2O masers with resolutions between 0.045" and 0.30". The weak continuum was cross calibrated with a strong maser feature that appears at v=170.7 km/s in the line data. The masers were then aligned to the continuum by using this reference line at v=170.7 km/s. Alignment errors are at the level of 0.01" (5.6x10-4 pc, or 115 AU at a distance of 11.4 kpc as determined by proper motion studies of Gwinn, Moran, & Reid 1992), which is a factor of ten better than previous observations. The center of outflow of these maser features appears to be located between two ultra-compact (UC) HII regions, within 0.2" of the bright source G2. This work was supported by the NSF sponsored REU program. The National Radio Astronomy Observatory is facility of the National Science Foundation operated under a cooperative agreement by Associated Universities, Inc.
de Pree Chris G.
Goss William Miller
McGrath Elizabeth J.
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