AAS 207th Meeting, 8-12 January 2006
Session 127 Polarization and Magnetic Fields in AGN
Poster, Wednesday, 9:20am-6:30pm, January 11, 2006, Exhibit Hall

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[127.02] Circular Polarization in PKS 1519-273

W. Bennett (Drake University), J.P. Macquart (NRAO), H. Johnston (University of Sydney), D. Jauncey (ATNF)

The intra-day variable BL Lac PKS 1519-273 exhibits variations at centimeter wavelengths in total intensity, linear polarization, and circular polarization. Their variability is caused by scintillation due to the interstellar medium. PKS 1519-273 displays 4% circular polarization at 4.8 GHz and the variability has persisted as long as the source has been observed. We present observations of this source over several years, showing that the circularly polarized emission is highly variable on micro-arcsecond scales. We determine properties of the structure of the emission by examining the light curves and associated scintillation theory.

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