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Jet kinematics of AGNs at high radio frequencies

Jorstad, S. G., Marscher, A. P., Lister, M. L., Stirling, A. M., Cawthorne, T. V., Gomez, J. L., Gear, Walter Kieran, Stevens, J. A., Robson, E. I., Smith, P. S. and Forster, J. R. 2006. Jet kinematics of AGNs at high radio frequencies. Presented at: Blazar Variability Workshop II, Miami, FL, USA, 10-12 April 2005. Published in: Miller, H. R., Marshall, K., Webb, J. R. and Aller, M. F. eds. Blazar Variability Workshop II: Entering the GLAST Era. Astronomical Society of the Pacific Conference Series , vol. 350. San Francisco, CA: Astronomical Society of the Pacific, pp. 149-154.

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Abstract

We have completed a 3 yr program of polarization monitoring of 15 active galactic nuclei with the Very Long Baseline Array at 7 mm wavelength. At some epochs the images are accompanied by nearly simultaneous polarization measurements at 3 mm, 1.35/0.85 mm, and optical wavelengths. We determine apparent velocities in the jets of all sources in the sample. We suggest a new method to estimate Doppler factor of the jet components based on their VLBI properties. This allows us to derive the Lorentz factors and viewing angles of superluminal knots and opening angles of the jets. The Lorentz factors of the jet flows in the different blazars range from Γ ∼ 5 to 40. The quasars in our sample have similar opening angles and marginally smaller viewing angles than the BL Lacs. The radio galaxies have lower Lorentz factors and wider viewing angles than the blazars.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Neuroscience and Mental Health Research Institute (NMHRI)
Subjects: Q Science > QB Astronomy
Additional Information: Proceedings of the Conference Held 10-12 April, 2005 at Florida International University, Miami, Florida, USA.
Publisher: Astronomical Society of the Pacific
ISBN: 1583812180
Last Modified: 04 Jun 2017 04:18
URI: http://orca-mwe.cf.ac.uk/id/eprint/36475

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