Extended radio emission round core-dominated quasars Constraints on relativistic beaming models

Astronomy and Astrophysics – Astronomy

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Astronomical Models, Quasars, Radio Emission, Relativistic Velocity, Astronomical Spectroscopy, Constraints

Scientific paper

The authors discuss relativistic beaming models in the light of VLA measurements of the extended structure round a sample of 135 flat-spectrum quasars. Two-thirds of these have structure on scales in excess of 2 arcsec. It is argued that these results support the Orr and Browne (1982) view that the parent population of flat-spectrum (core-dominated) quasars are steep-spectrum (lobe-dominated) quasars. Predictions of the Orr and Browne scheme are found to be in fair agreement with the observed strength and size of the extended radio emission. The core-dominated sources are more asymmetric than lobe-dominated sources and this may be caused by modest relativistic motion (β ≡ 0.20) within radio lobes.

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