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Multi-Epoch Observations of Survey Sources

Published online by Cambridge University Press:  04 August 2017

A.C.S. Readhead ,
T. J. Pearson  and
S. C. Unwin
A.C.S. Readhead
Affiliation:
Owens Valley Radio Observatory, California Institute of Technology
T. J. Pearson
Affiliation:
Owens Valley Radio Observatory, California Institute of Technology
S. C. Unwin
Affiliation:
Owens Valley Radio Observatory, California Institute of Technology

Abstract

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Five objects mapped as part of a VLBI survey have been re-observed at 5 GHz, and four of them have also been observed at 10 GHz. Three of the objects show no substantial structural variations: an upper limit of 2c can be placed on the apparent relative velocities of the components. One object (0711+356) shows structural variations which are mostly simply described in terms of a superluminal contraction. The remaining object (3C371, 1807+698) shows substantial structural variations which suggest that it probably is a superluminal source. The source 0710+439 is especially interesting as it consists of a central flat-spectrum core component straddled by two compact steep-spectrum components.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 110: VLBI and Compact Radio Sources , 1984 , pp. 131 - 134
Copyright
Copyright © Reidel 1984