TRIGONOMETRIC PARALLAX OF W51 MAIN/SOUTH

@article{Sato2010TRIGONOMETRICPO,
  title={TRIGONOMETRIC PARALLAX OF W51 MAIN/SOUTH},
  author={M. Sato and Mark J. Reid and Andreas Brunthaler and Karl M. Menten},
  journal={The Astrophysical Journal},
  year={2010},
  volume={720},
  pages={1055 - 1065}
}
We report measurement of the trigonometric parallax of W51 Main/South using the Very Long Baseline Array. We measure a value of 0.185 ± 0.010 mas corresponding to a distance of 5.41+0.31−0.28 kpc. W51 Main/South is a well-known massive star-forming region near the tangent point of the Sagittarius spiral arm of the Milky Way. Our distance to W51 yields an estimate of the distance to the Galactic center of R0 = 8.3 ± 0.46 (statistical) ±1.0 (systematic) kpc by simple geometry. Combining the… 

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