The Caltech-Jodrell Bank VLBI Surveys

Details The Caltech-Jodrell Bank VLBI Surveys The Caltech-Jodrell Bank VLBI Surveys

1997-10-24

arxiv.org/abs/astro-ph/9710267v1

IAU Coll. 164, ed Zensus et al, ASP Conf Series 144, 17-24 (1998)

Astronomy and Astrophysics

Astrophysics

8 pages; 1 figure; to be published in Proceedings of IAU Colloquium 164, Radio Emission from Galactic and Extragalactic Compac

Scientific paper

The Caltech-Jodrell Bank VLBI surveys of bright extragalactic radio sources north of declination 35 deg 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 CJ1 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.

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