Trigonometric Parallaxes of Massive Star Forming Regions: III. G59.7 0.1 and W 51 IRS2 - AstrophysicsReportar como inadecuado




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Abstract: We report trigonometric parallaxes for G59.7+0.1 and W 51 IRS2, correspondingto distances of 2.16^{+0.10} {-0.09} kpc and 5.1^{+2.9} {-1.4} kpc,respectively. The distance to G59.7+0.1 is smaller than its near kinematicdistance 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 tosignificant uncertainty, is close to its kinematic distance and places it nearthe tangent point of the Carina-Sagittarius arm. It also agrees well with arecent estimate based on O-type star spectro-photometry. Combining thedistances and proper motions with observed radial velocities gives the fullspace motions of the star forming regions. We find modest deviations of 5 to 10km-s from circular Galactic orbits for these sources, both counter to Galacticrotation and toward the Galactic center.



Autor: Y. Xu, M. J. Reid, K. M. Menten, A. Brunthaler, X. W. Zheng, L. Moscadelli

Fuente: https://arxiv.org/



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