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. B. Zhang and M. Sato and Mareki Honma and Tomoya Hirota and Kazuya Hachisuka and Y. K. 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° ± 3°, which favors four rather than two spiral arms for the Galaxy. Combining positions, distances, proper motions, and radial velocities yields complete three… 
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We report trigonometric parallaxes for the sources NGC 7538 and Cep A, corresponding to distances of 2.65+0.12−0.11 and 0.70+0.04−0.04 kpc, respectively. The distance to NGC 7538 is considerably
TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. V. G23.01−0.41 AND G23.44−0.18
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TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS: III. G59.7+0.1 AND W 51 IRS2
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TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. IV. G35.20−0.74 AND G35.20−1.74
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Galactic Rotation Derived from OB Stars Using Hipparcos Proper Motions and Radial Velocities
We have examined the systematic velocity field of the solar neighborhood, based on Hipparcos (High Precision PARallax Collecting Satellite) proper motions and ground-based radial velocities of about
Galactic Interior Motions Derived from Hipparcos Proper Motions. I. Young Disk Population
Analyzing Hipparcos proper motions of 1352 O–B5 stars other than the Gould belt stars, which are representative of the young disk population, we have found a clear stellar warping motion that is a
Astrometry of Galactic Star-Forming Region Sharpless 269 with VERA : Parallax Measurements and Constraint on Outer Rotation Curve
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We have used the Japanese VLBI array VERA to perform high-precision astrometry of an H2O maser source in the Galactic star-forming region NGC 281 West, which has been considered to be part of a
THE DISTANCE TO A STAR-FORMING REGION IN THE OUTER ARM OF THE GALAXY
We performed astrometric observations with the Very Long Baseline Army of WB89−437, an H2O maser source in the Outer spiral arm of the Galaxy. We measure an annual parallax of 0.167 ± 0.006 mas,
TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. I. S 252 & G232.6+1.0
We are conducting a large program with the NRAO Very Long Baseline Array (VLBA) to measure trigonometric parallaxes of massive star-forming regions across the Milky Way. Here we report measurement of
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