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Accurate OH maser positions II. the Galactic Center region
Hai-Hua Qiao, Andrew J. Walsh, Shari L. Breen +6
We present high spatial resolution observations of ground-state OH masers, achieved using the Australia Telescope Compact Array (ATCA). These observations were conducted towards 17…
Astrometrically registered maps of H2O and SiO masers toward VX Sagittarii
Dong-Hwan Yoon, Se-Hyung Cho, Youngjoo Yun +8
The supergiant VX Sagittarii is a strong emitter of both H2O and SiO masers. However, previous VLBI observations have been performed separately, which makes it difficult to spatial…
MultiView phase corrections at low frequencies for precise astrometry
Gabor Orosz, Maria J. Rioja, Richard Dodson +2
We present a multi-calibrator solution, i.e. MultiView, to achieve accurate astrometry on the level of the thermal noise at low VLBI frequencies dominated by ionospheric residuals.…
Bow shocks in water fountain jets
Gabor Orosz, José F. Gómez, Daniel Tafoya +4
We briefly introduce the VLBI maser astrometric analysis of IRAS 18043-2116 and IRAS 18113-2503, two remarkable and unusual water fountains with spectacular bipolar bow shocks in t…
H2O MegaMasers: a RadioAstron success story
Willem Baan, Alexey Alakoz, Tao An +8
The RadioAstron space-VLBI mission has successfully detected extragalactic H2O MegaMaser emission regions at very long Earth to space baselines ranging between 1.4 and 26.7 Earth D…