Observations of Radio Sources with an Interferometer of 24-km Baseline-III: THE ANGULAR STRUCTURES AT 408 AND 1423 MHz OF 44 RELATIVELY INTENSE RADIO SOURCES

Abstract

The results of long baseline radio interferometer studies at 408 and 1423 MHz of the angular structures of a sample of relatively intense radio sources, mainly from the 3CR catalogue, are presented. The Mk I–Mk III interferometer based at Jodrell Bank was used for this work; this instrument enabling radio components ≲ 1″.2 arc in half-power diameter at 408 MHz and ≲0″.4 arc in half-power diameter at 1423 MHz to be resolved. The sources were selected from the area of sky defined by δ >20°; b^II >20°, using the single criterion $$S_{1420}\geqslant3.2\times10^{-26}\enspace \text W \enspace \text m^{-2}\enspace \text {Hz}^{-1}$$ . Four other sources not satisfying these selection criteria were also observed. In this paper the results of the model fitting analysis of the visibility data are given and discussed for each source, and some of the more interesting points arising from them noted. A detailed discussion of the results in comparison with other angular structure observations will be given in a later paper.