Trigonometric parallaxes of star forming regions in the Perseus spiral arm

Journal Article · Fri Aug 01 04:00:00 EDT 2014 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/790/2/99· OSTI ID:22365529

Choi, Y. K.; Brunthaler, A.; Menten, K. M. ^[1]; Hachisuka, K. ^[2]; Reid, M. J.; Dame, T. M. ^[3]

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1. Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn (Germany)
2. Shanghai Astronomical Observatory, Chinese Academy of Science, Shanghai, 200030 (China)
3. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

We report trigonometric parallaxes and proper motions of water masers for 12 massive star forming regions in the Perseus spiral arm of the Milky Way as part of the Bar and Spiral Structure Legacy (BeSSel) Survey. Combining our results with 14 parallax measurements in the literature, we estimate a pitch angle of 9.°9 ± 1.°5 for a section of the Perseus arm. The three-dimensional Galactic peculiar motions of these sources indicate that on average they are moving toward the Galactic center and slower than the Galactic rotation.

• OSTI ID: 22365529
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 790; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
GALAXIES
INCLINATION
MASERS
MILKY WAY
OPTICS
PROPER MOTION
ROTATION
STARS
THREE-DIMENSIONAL CALCULATIONS
WATER