SIMBAD references

2010ApJ...720.1055S - Astrophys. J., 720, 1055-1065 (2010/September-2)

Trigonometric parallax of W51 Main/South.


Abstract (from CDS):

We report measurement of the trigonometric parallax of W51 Main/South using the Very Long Baseline Array. We measure a value of 0.185±0.010 mas corresponding to a distance of 5.41+0.31–0.28kpc. W51 Main/South is a well-known massive star-forming region near the tangent point of the Sagittarius spiral arm of the Milky Way. Our distance to W51 yields an estimate of the distance to the Galactic center of R0= 8.3±0.46 (statistical) ±1.0 (systematic) kpc by simple geometry. Combining the parallax and proper motion measurements for W51, we obtained the full-space motion of this massive star-forming region. We find W51 is in a nearly circular orbit about the Galactic center. The H2 O masers used for our parallax measurements trace four powerful bipolar outflows within a 0.4 pc size region, some of which are associated with dusty molecular hot cores and/or hyper- or ultra-compact H II regions.

Abstract Copyright:

Journal keyword(s): astrometry - Galaxy: fundamental parameters - Galaxy: kinematics and dynamics - Galaxy: structure - ISM: individual objects: W51 - masers

VizieR on-line data: <Available at CDS (J/ApJ/720/1055): table3.dat table4.dat>

Nomenclature: Table 2: [SRB2010] J1922+1504 N=1.

Simbad objects: 28

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