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arxiv: astro-ph/0512226 · v2 · submitted 2005-12-08 · 🌌 astro-ph

Water maser motions in W3(OH) and a determination of its distance

K. Hachisuka (MPIfR , University of Valencia) , A. Brunthaler (MPIfR , JIVE) , K. M. Menten (MPIfR) , M. J. Reid (CfA) , H. Imai (Kagoshima University) , Y. Hagiwara (NAOJ
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ASTRON) M. Miyoshi (NAOJ) S. Horiuchi (Swinburne University of Technology) T. Sasao (Ajou University)
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classification 🌌 astro-ph
keywords distancemasermotionsobservationsparallaxregionabsoluteannual
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We report phase-referencing VLBA observations of H2O masers near the star-forming region W3(OH) to measure their parallax and absolute proper motions. The measured annual parallax is 0.489 +/- 0.017 milli-arcseconds (2.04 +/- 0.07 kpc), where the error is dominated by a systematic atmospheric contribution. This distance is consistent with photometric distances from previous observations and with the distance determined from CH3OH maser astrometry presented in a related paper. We also find that the source driving the H2O outflow, the ``TW-object'', moves with a 3-dimensional velocity of > 7 km/s relative to the ultracompact HII region W3(OH).

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