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Published 1998 | Published + Submitted
Book Section - Chapter Open

Caltech-Jodrell Bank VLBI Surveys


The Caltech-Jodrell Bank VLBI surveys of bright extragalactic radio sources north of declination 35° were carried out between 1990 and 1995 using the Mark-II system, achieving images with a resolution of about 1 mas at 5 GHz. The CJl survey (together with the older "PR" survey) includes 200 objects with 5 GHz flux density greater than 0.7 Jy; the CJ2 survey includes 193 flat-spectrum sources with 5 GHz flux density greater than 0.35 Jy; and we have defined a complete flux-density limited sample, CJF, of 293 flat-spectrum sources stronger than 0.35 Jy. We summarize the definition of the samples and the VLBI, VLA, MERLIN, and optical observations, and present some highlights of the astrophysical results. These include: (1) superluminal motion and cosmology; (2) morphology and evolution of the "compact symmetric objects" (CSOs); (3) two-sided motion in some CSOs; (4) the angular-size-redshift diagram; (5) misalignment of parsec-scale and kiloparsec-scale jets.

Additional Information

© 1998 Astronomical Society of the Pacific. The CJ surveys represent one of the largest VLBI projects carried out prior to the completion of the VLBA, and we are very grateful to the personnel of the participating observatories and of the Caltech/JPL correlator for making the surveys possible. The work at Caltech was supported by the National Science Foundation (AST-9117100 and AST-9420018). 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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August 19, 2023
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