A Pencil-Beam Survey of Radio Sources at 178 MHz

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Abstract
A sample region of the sky surveyed by the 4C interferometer has been observed by a pencil-beam instrument at the same frequency. Flux densities are given for 726 sources, 640 of which are also contained in the 4C catalogue. In addition to listing some new sources with angular sizes greater than a few minutes of arc, the present results have been compared with the 4C interferometer data to derive an upper limit for the number of sources omitted from the 4C catalogue due to partial resolution; the comparison also shows that the proportion of sources in the 4C catalogue whose flux densities are seriously underestimated (low by more than 30 per cent) is about 7 per cent.

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