A TRIGONOMETRIC PARALLAX OF Sgr B2

@article{Reid2009ATP,
  title={A TRIGONOMETRIC PARALLAX OF Sgr B2},
  author={Mark J. Reid and Karl M. Menten and X. W. Zheng and Andreas Brunthaler and Y. Xu},
  journal={The Astrophysical Journal},
  year={2009},
  volume={705},
  pages={1548 - 1553}
}
We have measured the positions of H2O masers in Sgr B2, a massive star-forming region in the Galactic center, relative to an extragalactic radio source with the Very Long Baseline Array. The positions measured at 12 epochs over a time span of one year yield the trigonometric parallax of Sgr B2 and hence a distance to the Galactic center of R0 = 7.9+0.8−0.7 kpc. The proper motion of Sgr B2 relative to Sgr A* suggests that Sgr B2 is ≈0.13 kpc nearer than the Galactic center, assuming a low… 

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