Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-15
Astron.J.132:2376-2382,2006
Astronomy and Astrophysics
Astrophysics
Accepted for publication in AJ
Scientific paper
10.1086/508412
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.
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