The First Caltech-Jodrell Bank VLBI Survey

Details The First Caltech-Jodrell Bank VLBI Survey The First Caltech-Jodrell Bank VLBI Survey

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.7505x&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #75.05; Bulletin of the American Astronomical Society, Vol. 25, p.1409

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We have completed the first Caltech--Jodrell Bank VLBI survey (CJ1). The CJ1 sample includes all 135 extragalatic sources in the S4 (Pauliny-Toth et al., 1978, A.J., 83, 451) and S5 (K{u}hr et al., 1981, A.J., 86, 854) surveys with 0.7 Jy <= S(5GHz) <= 1.3 Jy, delta >= 35(deg) , and |b| >= 10(deg) which, combined with the Pearson--Readhead sample (1988, Ap.J., 328, 114) of 65 sources brighter than 1.3 Jy in the same sky region, provides a complete flux-limited sample of 200 sources. In the past three years we developed and successfully implemented the ``VLBI-SNAPSHOT'' technique. This new technique has increased the observation efficiency by an order of magnitude. The main objectives of this study are: (1) to classify these objects, based on radio morphologies on all scales and radio spectrum; Such a classification is an essential pre-requisite to understanding the physics and evolution of the radio loud active galaxies; it is also an important observational foundation for testing various ``Unified Schemes''. (2) to make interesting statistical tests by class, such as cosmological evolution; (3) to reveal the relationships between different classes, if any; and (4) to study the physics of individual objects of interest. In this paper we will present all the 5 GHz VLBI maps and the morphological classification on both arcsec and milliarcsec scales. On milliarcsec scale the objects are separated into three classes: Compact and Core-Jet, Compact Symmetric Object, and Unclassified, which is a simplified version of the classification scheme of Pearson & Readhead (1988).

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