Abstract
The observational properties of extragalactic radio sources of sizes comparable with or greater than a typical galactic diameter and intrinsic luminosities at 408 MHz greater than 10 to the 23rd W/Hz are discussed. Following a survey of the major instrumental and observational techniques developed over the last three decades for the measurement of source structure, classes of radio structure that are commonly observed, including narrow edge-brightened and -darkened double sources, narrow- and wide-tailed sources and cluster halos, are described, and various taxonomic sequences of these morphologies are discussed. Means by which such physical properties as the energetics, confinement parameters, magnetic fields, sites of electron acceleration and rotation are derived from intensity and polarization distribution measurements are examined, and the observed characteristics of the various components of extended radio sources are considered in detail, including diffuse emission regions, hot spots, cores and jets. Finally, relationships of radio source morphologies to the properties of the parent galaxies and clusters are reviewed, and a model of the radio-source phenomenon is proposed.
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