Errors in kinematic distances and our image of the Milky Way Galaxy

Abstract

Errors in the kinematic distances, under the assumption of circular gas orbits, were estimated by performing synthetic observations of a model disk galaxy. It was found that the error is < 0.5 kpc for most of the disk when the measured rotation curve was used, but larger if the real rotation curve is applied. In both cases, the error is significantly larger at the positions of the spiral arms. The error structure is such that, when kinematic distances are used to develope a picture of the large scale density distribution, the most significant features of the numerical model are significantly distorted or absent, while spurious structure appears. By considering the full velocity field in the calculation of the kinematic distances, most of the original density structures can be recovered.

arXiv commentAccepted for publication in AJ

References in corpus (7)

• Three Dimensional Structure of the Milky Way Disk
• Resolution of Distance Ambiguities of Inner Galaxy Massive Star Formation Regions II
• Nonlinear Effects in Models of the Galaxy: 1. Midplane Stellar Orbits in the Presence of 3D Spiral Arms
• A Plausible Galactic Spiral Pattern and its Rotation Speed
• 3D MHD Modeling of the Gaseous Structure of the Galaxy: Description of the Simulations
• 3D MHD Modeling of the Gaseous Structure of the Galaxy: Synthetic Observations
• On the Galactic Spiral Patterns: Stellar and Gaseous

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