VLBA Observations of Radio Reference Frame Sources. I.

Details VLBA Observations of Radio Reference Frame Sources. I. VLBA Observations of Radio Reference Frame Sources. I.

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.1302f&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #13.02; Bulletin of the American Astronomical Society, Vol. 27, p.1301

Astronomy and Astrophysics

Astronomy

Scientific paper

We present first epoch simultaneous dual--frequency VLBA 2 GHz & 8 GHz observations of a sample of 42 of the 560 extragalactic sources within the radio reference frame (Johnston et al. \ 1995,AJ,110,880). Many of the sources have dominant cores containing the majority of the total flux density and angular sizes less than several milliarcseconds. However, at some level, almost all of the observed sources show structure characteristic of a core--jet morphology, often with multiple jet components. Sources with dominant cores are known to be highly variable, both spatially and temporally. Frequent observations of the radio reference frame sources are therefore necessary to determine the level at which source structure variation, such as superluminal motion, will affect the long term stability and accuracy of the radio reference frame.

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