Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.1405f&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #14.05; Bulletin of the American Astronomical Society, Vol. 28, p.1292
Astronomy and Astrophysics
Astronomy
Scientific paper
We present simultaneous dual-frequency VLBA 2 GHz and 8 GHz observations of 133 of the 560 extragalactic sources for which positions were reported by Johnston et al. (1995,AJ,110,880). These observations represent the second in a series of observations intended to image the entire set of sources presented by Johnston et al. and, together with previously reported observations, bring the total number of sources observed so far to 169. We use these data to quantify the magnitude of the expected effect of intrinsic source structure on astrometric bandwidth synthesis Very Long Baseline Interferometry observations. We also calculate a source ``structure index'' which can be used as an estimate of the astrometric quality of the sources.
Charlot Patrick
Fey Alan
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