Trigonometric Parallaxes of Star Forming Regions in the Scutum Spiral Arm

@inproceedings{Sato2014TrigonometricPO,
  title={Trigonometric Parallaxes of Star Forming Regions in the Scutum Spiral Arm},
  author={M. Sato and Y. W. Wu and Katharina Immer and B. Zhang and Alberto Sanna and Mark J. Reid and Thomas M. Dame and Andreas Brunthaler and Karl M. Menten},
  year={2014}
}
We report measurements of trigonometric parallaxes for six high-mass star-forming regions in the Scutum spiral arm of the Milky Way as part of the BeSSeL Survey. Combining our measurements with 10 previous measurements from the BeSSeL Survey yields a total sample of 16 sources in the Scutum arm with trigonometric parallaxes in the Galactic longitude range from 5 to 32. Assuming a logarithmic spiral model, we estimate a pitch angle of 198. ± 31. for the Scutum arm, which is larger than pitch… 
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