1. First VLBA Images of the Nuclei in 3CR Lobe-dominated Quasars
- Author
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Zensus, J. Anton, Taylor, G. B., Wrobel, Joan M., Hough, D. H., Vermeulen, R. C., Readhead, A. C. S., Zensus, J. Anton, Taylor, G. B., Wrobel, Joan M., Hough, D. H., Vermeulen, R. C., and Readhead, A. C. S.
- Abstract
We report the first VLBA images of the nuclei in eight objects from the 3CR complete sample of 25 lobe-dominated quasars (LDQs): 3C 207, 3C 208, 3C 212, 3C 245, 3C 249.1, 3C 263, 3C 270.1, and 3C 275.1. These images reveal core-jet structures of considerable extent and complexity. In combination with earlier VLBI work on the 3CR LDQ sample, the partial distribution of apparent parsec-scale jet speeds for ten objects is relatively flat up to ~ 5h^(−1) c, or perhaps even ~ 10h^(−1) c. While this is not inconsistent with simple beaming models and quasar-FR II radio galaxy unification, it is crucial to obtain the complete speed distribution for truly definitive tests. Work is in progress on multi-frequency, dual-polarization, and phase-referencing VLBA observations on selected objects in the sample.
- Published
- 1998