Faraday rotation in the MOJAVE blazars: 3C 273 a case study

• Main Authors: Hovatta, T., Lister, M. L., Aller, M. F., Aller, H. D., Homan, D. C., Kovalev, Y. Y., Pushkarev, A. B, Savolainen, T.
• Format: Text
• Language: unknown
• Published: arXiv 2011
• Subjects: High Energy Astrophysical Phenomena astro-ph.HE; Cosmology and Nongalactic Astrophysics astro-ph.CO; FOS Physical sciences; Faraday; Muonio
• Online Access: https://dx.doi.org/10.48550/arxiv.1108.1514; https://arxiv.org/abs/1108.1514

Radio polarimetric observations of Active Galactic Nuclei can reveal the magnetic field structure in the parsec-scale jets of these sources. We have observed the gamma-ray blazar 3C 273 as part of our multi-frequency survey with the Very Long Baseline Array to study Faraday rotation in a large sample of jets. Our observations re-confirm the transverse rotation measure gradient in 3C 273. For the first time the gradient is seen to cross zero which is further indication for a helical magnetic field and spine-sheath structure in the jet. We believe the difference to previous epochs is due to a different part of the jet being illuminated in our observations. : 6 pages, 3 figures. To appear in the proceedings of "Beamed and Unbeamed Gamma-rays from Galaxies", held in Muonio, Finland, April 11-15, 2011. Journal of Physics: Conference Series