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| Paper: |
VLBA Observations of Radio Reference Frame Sources. II. Astrometric Suitability Based on Observed Structure |
| Volume: |
144, Radio Emission from Galactic and Extragalactic Compact Sources, IAU Colloquium 164 |
| Page: |
387 |
| Authors: |
Fey, A. L.; Charlot, P. |
| Abstract: |
We use source models derived from VLBA observations of 169 extragalactic sources to quantify the expected effects of intrinsic source structure on astrometric bandwidth synthesis VLBI observations. We define a source ``structure index'' based on the median structure corrections and suggest that this index can be used as an estimate of the astrometric quality of the sources. A correlation between the compactness of the sources and their formal position uncertainties was found indicating that the more extended sources have larger formal position uncertainties. |
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