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Open AccessArticle

JVLA Wideband Polarimetry Observations on a Sample of High Rotation Measure Sources

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Max-Planck Institut für Radioastronomie (MPIfR), Auf dem Hügel 69, D-53121 Bonn, Germany
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Instituto de Radioastronomía y Astrofísica (IRyA-UNAM), Antigua Carretera a Pátzcuaro 8701, 58089 Morelia, Michoacán, Mexico
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Instituto de Astronomía (IA-UNAM), Circuito Exterior, área de la Investigación Científica, Ciudad Universitaria, Ciudad de México C.P. 04510 , México
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Istituto di Radioastronomia (IRA-INAF), Via Gobetti 101, I-40129 Bologna, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: Jose L. Gómez, Alan P. Marscher and Svetlana G. Jorstad
Galaxies 2016, 4(4), 66; https://doi.org/10.3390/galaxies4040066
Received: 17 July 2016 / Revised: 9 November 2016 / Accepted: 12 November 2016 / Published: 24 November 2016
(This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes)
We present preliminary results of JVLA wideband full polarization observations of a sample of Active Galactic Nuclei (AGN) with very high Rotation Measure (RM) values, a sign of extreme environment. Polarization properties show a complex behaviour such that the polarization angle (PA) and fractional polarization (fp) change dramatically within the wide band. The measured RM is not constant within the wide band. Its complex behaviour reflects the complexity of the medium with the presence of several Faraday components. The depolarization has been studied by modelling the variations of the Stokes parameters Q and U together with the polarization parameters (PA and fp) with wavelength using combinations of the simplest existing depolarization models. With this JVLA study we could spectrally resolve multiple polarized components of unresolved AGN. These preliminary results reveal the complexity of these objects, but improvements to the depolarization modelling are needed to better understand the polarization structure of these sources. View Full-Text
Keywords: AGN; polarimetry AGN; polarimetry
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Pasetto, A.; Carrasco-González, C.; Bruni, G.; Basu, A.; O’Sullivan, S.; Kraus, A.; Mack, K.-H. JVLA Wideband Polarimetry Observations on a Sample of High Rotation Measure Sources. Galaxies 2016, 4, 66.

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