Trigonometric parallaxes of star forming regions in the Sagittarius spiral arm

Abstract

We report measurements of parallaxes and proper motions of ten high-mass star-forming regions in the Sagittarius spiral arm of the Milky Way as part of the BeSSeL Survey with the VLBA. Combining these results with eight others from the literature, we investigated the structure and kinematics of the arm between Galactocentric azimuth around -2 and 65 deg. We found that the spiral pitch angle is 7.3 +- 1.5 deg; the arm's half-width, defined as the rms deviation from the fitted spiral, is around 0.2 kpc; and the nearest portion of the Sagittarius arm is 1.4 +- 0.2 kpc from the Sun. Unlike for adjacent spiral arms, we found no evidence for significant peculiar motions of sources in the Sagittarius arm opposite to Galactic rotation.

43 pages, 10 figures, 8 tables. Accepted by A&A

References in corpus (9)

• Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parameters and Non-Circular Motions
• The Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey
• A Catalog of Extended Green Objects (EGOs) in the GLIMPSE Survey: A new sample of massive young stellar object outflow candidates
• The Milky Way's circular velocity curve between 4 and 14 kpc from APOGEE data
• DiFX: A software correlator for very long baseline interferometry using multi-processor computing environments
• Water maser motions in W3(OH) and a determination of its distance
• H2O Maser Observations of Candidate Post-AGB Stars and Discovery of Three High-velocity Water Sources
• ATCA 3mm observations of NGC6334I and I(N): dense cores, outflows and an UCHII region
• The BLAST View of the Star Forming Region in Aquila (ell=45deg,b=0deg)

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