Radio evolution of quasars at z < 1

Astronomy and Astrophysics – Astronomy

Scientific paper

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Quasars, Radio Sources (Astronomy), Red Shift, Stellar Luminosity, Morphology, Sky Surveys (Astronomy)

Scientific paper

A sample of 128 quasars with redshifts less than 1.0 observed at 6 cm and 20 cm with the A array of the VLA are presented and discussed. It is found that the source size envelope varies with both redshift and core luminosity, being smaller for high values of both. More luminous sources have greater core dominance, and the largest sources tend to have low-luminosity cores. Core variability tends to increase with luminosity and with redshift. The distribution of the ratio of core-lobe distances is consistent with a simple model of initial alternating ejection at nonrelativistic velocities. The ratios of lobe luminosities also show no evidence of relativistic beaming. The evidence suggests a general evolution of individual sources in which the source is initially a luminous core only, whose luminosity falls with time. The lobes develop initially as a one-sided structure, but eventually form large triple sources with a fading core.

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