Jorstad, S., Marscher, A., Stevens, J., Smith, P., Forster, J., Lister, M., Stirling, A., Gómez, J., Cawthorne, T., Gear, Walter Kieran ![]() |
Abstract
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 |
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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 |
URI: | https://orca.cardiff.ac.uk/id/eprint/35822 |
Citation Data
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