On the rapid optical variability of PKS 0219-164

Astronomy and Astrophysics – Astronomy

Scientific paper

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Bl Lacertae Objects, Light Curve, Optical Polarization, Radio Sources (Astronomy), Synchrotron Radiation, Brightness, Faraday Effect, Photometry, Variations

Scientific paper

Strong and highly variable optical polarization as well as dramatic brightness variations (3 mag within 1 week) were detected during optical observations of the flat-spectrum radio source PKS 0219-164. No strong emission lines are present in low-dispersion spectra, so PKS 0219-164 is classified as an extremely variable BL Lacertae object. The observed variations in polarization and flux fit into a simple model, in which the optical radiation is emitted by the synchrotron process in a rotating magnetic field. Further observations are proposed to test the validity of this model.

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