The radio morphology of blazars and relationships to optical polarization and to normal radio galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Bl Lacertae Objects, Blazars, Optical Polarization, Quasars, Radio Astronomy, Astronomical Catalogs, Astronomical Maps, Galactic Nuclei, Galactic Structure, Radio Galaxies, Relativistic Effects

Scientific paper

The authors present high dynamic range VLA maps of 16 BL Lac objects and highly polarized quasars. Extended radio structure with a variety of morphologies is common in the sample. There is weak evidence for a connection between preferred position angles of optical polarization and radio morphology. Preferred-angle objects are more likely to exhibit two-sided radio structure than random-angle objects. A much stronger correlation is found for random-angle objects between the prominence of the radio core and the rms scatter in the position angle of the optical polarization. There is remarkably good agreement between the position angle of the small-scale radio structure and the characteristic angle of optical polarization. Four of five sources are aligned within 15°. The luminosity of the extended radio emission from BL Lac objects is compared with that of "normal" radio galaxies. It is concluded that the results of this study can be successfully interpreted within the context of the relativistic jet model.

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