Abstract
The VLA has been used to map 60 radio-loud QSOs in order to discriminate between redshift- and luminosity-dependent evolutionary effects. It is found that the mean source size decreases with increasing redshift in a manner consistent with the interpretation of redshift as a measure of distance. Among the low-redshift (z less than 1) objects, large-scale symmetric double-lobed emission is common, as are asymmetric one-sided radio jets. It appears that alternating, one-sided ejection is required to reconcile the large-scale source symmetry with the asymmetric radio jets. However, if such a description is valid, energy must be transported from the nucleus to the outer lobes at an appreciable fraction of the speed of light. However, the lobes apparently remain nearly static, i.e., they are confined structures that brighten and fade as energy is intermittently supplied to them, but they are not dispersed by this process.
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