Some aspects of the radio morphology of quasars with Z < 1
Date
1989
Authors
Price, John Robin
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Abstract
The Very Large Array synthesis telescope has been used to observe a carefully-selected sample of ~100 radio-loud quasars of redshift less than one. The telescope produces high-resolution and high-sensitivity images that allow detailed analysis of the radio structure. The images are presented and discussed. The measurements obtained from these images provide a large data base of quasar radio properties, which have been used to test the sample for evidence of alternating ejection and relativistic beaming of plasma from the quasar nucleus. The outer parts (lobes) of the radio strucĀtures appear to be moving with non-relativistic velocities and show some evidence for alternating ejection. Narrow 'jet' structures are observed on only one side of the core in any one quasar, but do not display direct eviĀdence of alternating sides. Within the framework of the models considered, the jets appear to be transporting material at speeds greater than that of the outer lobes, and there is some evidence for bulk relativistic motion in the jet and core components.