AAS 205th Meeting, 9-13 January 2005
Session 91 Surveys and Catalogs
Poster, Wednesday, January 12, 2005, 9:20am-6:30pm, Exhibit Hall

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[91.12] Extending the ICRF to Higher Radio Frequencies -- Imaging Results

A.L. Fey, D.A. Boboltz (U.S. Naval Observatory), P. Charlot (Bordeaux Observatory), E.B. Fomalont (NRAO), G.E. Lanyi, L.D. Zhang (JPL), K-Q VLBI Survey Collaboration

We present source structure analysis of approximately 230 extragalactic sources observed using the Very Long Baseline Array (VLBA) at 24 GHz and 43 GHz as part of a joint NASA, USNO, NRAO and Bordeaux Observatory program to extend the International Celestial Reference Frame (ICRF) to higher radio frequencies. The long term goals of this program are a) to develop higher frequency reference frames for improved deep space navigation, b) to extend the VLBA calibrator catalog at 24 and 43 GHz, c) to provide the benefit of the ICRF catalog to new applications at these higher frequencies and d) to study source structure variation at 24 and 43 GHz in order to improve the astrometric accuracy. In this paper, we concentrate on the latter goal of evaluating the intrinsic structure of the observed sources. A large fraction of the 230 sources have been observed at multiple epochs allowing us to estimate structural variations over time. We classify the sources in terms of their suitability for use in the new high frequency reference frames based on their spatial compactness and temporal stability.

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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.