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

Published online by Cambridge University Press:  12 April 2016

D.H. Hough ,
R.C. Vermeulen  and
A.C.S. Readhead
D.H. Hough
Affiliation:
Trinity University, Department of Physics, San Antonio, TX 78209, U.S.A.
R.C. Vermeulen
Affiliation:
Netherlands Foundation for Research in Astronomy, Dwingeloo, The Netherlands
A.C.S. Readhead
Affiliation:
Caltech, Mail Code 105-24, Pasadena, CA 91125, U.S.A.

Abstract

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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−1c, or perhaps even ~ 10h−1c. 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 phasereferencing VLBA observations on selected objects in the sample.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 164: Radio Emission from Galactic and Extragalactic Compact Sources , 1998 , pp. 83 - 84
Copyright
Copyright © Astronomical Society of the Pacific 1998

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