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Multifrequency polarization properties of blazars

Jorstad, S., Marscher, A., Stevens, J., Smith, P., Forster, J., Lister, M., Stirling, A., Gómez, J., Cawthorne, T., Gear, Walter Kieran ORCID: and Robson, I. 2006. Multifrequency polarization properties of blazars. Chinese Journal of Astronomy and Astrophysics 6 (S1) , pp. 247-252. 10.1088/1009-9271/6/S1/31

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We report preliminary results of a 3-year multifrequency polarization campaign of 15 AGNs of blazar type, including bimonthly total and polarized intensity imaging at 7 mm with the VLBA. We find that the sources have two different dependences of degree of polarization on wavelength: sub-mm peaked or straight ``polarization spectra''. The fractional polarization of the latter group increases with frequency. All sources with sub-mm peak polarization (6 objects) have similar degree of polarization in the optical region and in the VLBA core. In high-optically polarized sources (5 objects) the EVPAs at all frequencies align with the pc-scale jet direction within the 1σ uncertainties. This implies that the high frequency emission is co-spatial with the VLBI core and/or transverse shocks in the jet.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Institute of Physics Science
ISSN: 1009-9271
Last Modified: 21 Oct 2022 09:16

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