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28 March 2024
 
  » arxiv » astro-ph/0409343

 Article overview


Distance of W3(OH) by VLBI annual parallax measurement
K. Hachisuka ; A. Brunthaler ; Y. Hagiwara ; K. M. Menten ; H. Imai ; M. Miyoshi ; T. Sasao ;
Date 14 Sep 2004
Subject astro-ph
Affiliation2,1), Y. Hagiwara , K. M. Menten , H. Imai , M. Miyoshi , T. Sasao (MPIfR, JIVE, ASTRON, Kagoshima University, NAOJ, Ajou University
AbstractThe 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.
Source arXiv, astro-ph/0409343
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