First VLBA Images of the Nuclei in 3CR Lobe-dominated Quasars

Hough, D. H.; Vermeulen, R. C.; Readhead, A. C. S.

doi:10.1017/S025292110004464X

Published 1998 | Version Published

Book Section - Chapter Open

First VLBA Images of the Nuclei in 3CR Lobe-dominated Quasars

1. Trinity University
2. Netherlands Institute for Radio Astronomy
3. California Institute of Technology

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Others:

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.

Additional Information

© 1998 Astronomical Society of the Pacific. DHH is grateful for support under NSF grant AST-9422075, and wishes to acknowledge the significant contributions to this work by Trinity undergraduates Erika Barth, Philip Beyer, Lara Cross, and Ellen Phifer. The National Radio Astronomy Observatory is a facility of the National Science Foundation, operated under a cooperative agreement by Associated Universities, Inc.

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