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Distance of W3(OH) by VLBI annual parallax measurement

K. Hachisuka·A. Brunthaler·Y. Hagiwara·K. M. Menten·H. Imai·M. Miyoshi·T. Sasao
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Abstract

The most powerful tool for measuring distances within our Galaxy is the annual parallax. We carried out phase-referencing VLBI observations of H$_{2}$O masers in the star forming region W3(OH) with respect to the extragalactic continuum source ICRF 0244+624 to measure their absolute proper motions. The measured annual parallax is 0.484 $\pm$ 0.004 milli-arcseconds which corresponds to a distance of 2.07^{+0.01}_{-0.02}$ kpc from the sun. This distance is consistent with photometric and kinematic distances from previous observations.

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K. Hachisuka, A. Brunthaler, Y. Hagiwara, K. M. Menten, H. Imai, M. Miyoshi, T. Sasao. 2004-09-14. Distance of W3(OH) by VLBI annual parallax measurement. https://arxiv.org/abs/astro-ph/0409343

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