TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. VI. GALACTIC STRUCTURE, FUNDAMENTAL PARAMETERS, AND NONCIRCULAR MOTIONS

@article{Reid2009TRIGONOMETRICPO,
  title={TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. VI. GALACTIC STRUCTURE, FUNDAMENTAL PARAMETERS, AND NONCIRCULAR MOTIONS},
  author={Mark J. Reid and Karl M. Menten and X. W. Zheng and Andreas Brunthaler and Luca Moscadelli and Y. Xu and B. Zhang and M. Sato and Mareki Honma and Tomoya Hirota and Kazuya Hachisuka and Y. Choi and George A. Moellenbrock and A. Bartkiewicz},
  journal={The Astrophysical Journal},
  year={2009},
  volume={700},
  pages={137-148}
}
We are using the Very Long Baseline Array and the Japanese VLBI Exploration of Radio Astronomy project to measure trigonometric parallaxes and proper motions of masers found in high-mass star-forming regions across the Milky Way. Early results from 18 sources locate several spiral arms. The Perseus spiral arm has a pitch angle of 16 degrees +/- 3 degrees, which favors four rather than two spiral arms for the Galaxy. Combining positions, distances, proper motions, and radial velocities yields… Expand
TRIGONOMETRIC PARALLAXES OF HIGH MASS STAR FORMING REGIONS: THE STRUCTURE AND KINEMATICS OF THE MILKY WAY
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  • M. Reid
  • Physics
  • Proceedings of the International Astronomical Union
  • 2012
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TLDR
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