Distance of W3(OH) by VLBI annual parallax measurement

Details Distance of W3(OH) by VLBI annual parallax measurement Distance of W3(OH) by VLBI annual parallax measurement

2004-09-14

arxiv.org/abs/astro-ph/0409343v1

Astronomy and Astrophysics

Astrophysics

Proceedings of the 7th European VLBI Network Symposium (October 12-15 2004, Toledo, Spain), eds. Bachiller, R., Colomer, F., D

Scientific paper

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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