Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20910518f&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #105.18; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We present Very Long Baseline Array (VLBA) observations of the 1665 and 1667 MHz OH masers in the massive star forming region W75 N. Magnetic field strengths as large as 40 mG are deduced from Zeeman splitting and multi-transition overlap near continuum source VLA 2. Comparison of the maser positions with similar VLBA data taken four years previously allows for analysis of maser proper motions. Most masers are moving at an average speed of 3-5 km/s. However, the brightest (> 400 Jy) maser, located near VLA 2, is moving at over 50 km/s with respect to the rest of the masers in W75 N. Most bright maser spots are recovered between the two epochs, except near VLA 2. These characteristics suggest that the masers near VLA 2 may be tracing an energetic outflow. Motions in the southeasternmost cluster of maser spots may be indicating expansion around a small unseen exciting source.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
Fish Vincent Louis
Reid Mark J.
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