Astrophys. J., 693, 413-418 (2009/March-1)
Trigonometric parallaxes of massive star-forming regions: III. G59.7+0.1 and W 51 IRS2.
XU Y., REID M.J., MENTEN K.M., BRUNTHALER A., ZHENG X.W. and MOSCADELLI L.
Abstract (from CDS):
We report trigonometric parallaxes for G59.7+0.1 and W 51 IRS2, corresponding to distances of 2.16+0.10–0.09 kpc and 5.1+2.9–1.4kpc, respectively. The distance to G59.7+0.1 is smaller than its near kinematic distance and places it between the Carina-Sagittarius and Perseus spiral arms, probably in the Local (Orion) spur. The distance to W 51 IRS2, while subject to significant uncertainty, is close to its kinematic distance and places it near the tangent point of the Carina-Sagittarius arm. It also agrees well with a recent estimate based on O-type star spectro/photometry. Combining the distances and proper motions with observed radial velocities gives the full space motions of the star-forming regions. We find modest deviations of 5-10 km/s from circular Galactic orbits for these sources, both counter to Galactic rotation and toward the Galactic center.
astrometry - Galaxy: structure - stars: individual (G59.7 + 0.1, W 51 IRS2) - techniques: interferometric
Sources J1922+1504, J1924+1504 and J1943+2330 are not in Simbad.
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