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Session 14 - Surveys.
Display session, Monday, January 13
Metropolitan Ballroom,

[14.05] VLBA Observations of Radio Reference Frame Sources. II. Source Classification Based on Intrinsic Structure

A. Fey (US Naval Observatory), P. Charlot (Paris Observatory)

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.

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