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VLBA Observations of Radio Reference Frame Sources. II. Astrometric Suitability Based on Observed Structure

Published online by Cambridge University Press:  12 April 2016

A. L. Fey  and
P. Charlot
A. L. Fey
Affiliation:
United States Naval Observatory, Washington, D.C.
P. Charlot
Affiliation:
Paris Observatory, Paris, France

Abstract

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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.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 164: Radio Emission from Galactic and Extragalactic Compact Sources , 1998 , pp. 387 - 388
Copyright
Copyright © Astronomical Society of the Pacific 1998

References

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