Trigonometric Parallaxes of Star Forming Regions in the Scutum Spiral Arm

  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},
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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The second realization of the International Celestial Reference Frame (ICRF2) at radio wavelengths is presented, adopted by the International Astronomical Union as the new fundamental celestial reference frame, replacing ICRF1 as of 2010 January 1.
Information Handling in Astronomy
The information flow in astronomy is described as "from data files to information hubs: Beyond technologies and methodologies A. heck.
From the systemic
  • 2009
2010b), we detected total 21 maser features in at least 3 epochs over all 11 epochs. Figure A.6 shows the position and proper motions of each maser feature relative to the reference maser spot
  • Based on the criteria
  • 2010
The maser groups
  • 2009
We measure a trigonometric parallax
  • 2003