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Galaxies 2018, 6(2), 40; https://doi.org/10.3390/galaxies6020040

Probing the Large Faraday Rotation Measure Environment of Compact Active Galactic Nuclei

1
Instituto de Radioastronomía y Astrofísica (IRyA-UNAM), Antigua Carretera a Pátzcuaro, Morelia, Michoacán 58341, Mexico
2
Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
3
Max-Planck Institut für Radioastronomie (MPIfR), Auf dem Hügel 69, D-53121 Bonn, Germany
4
Istituto di Astrofisica e Planetologia Spaziali (IAPS-INAF), via Fosso del Cavaliere 100, I-00133 Rome, Italy
5
Instituto de Astronomía, UNAM, Apartado Postal 70-264, Mexico 04510 , Mexico
6
Istituto di Radioastronomia (IRA-INAF), Via Gobetti 101, I-40129 Bologna, Italy
*
Author to whom correspondence should be addressed.
Received: 16 February 2018 / Revised: 16 March 2018 / Accepted: 19 March 2018 / Published: 26 March 2018
(This article belongs to the Special Issue Polarised Emission from Astrophysical Jets)
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Abstract

Knowing how the ambient medium in the vicinity of active galactic nuclei (AGNs) is shaped is crucial to understanding generally the evolution of such cosmic giants as well as AGN jet formation and launching. Thanks to the new broadband capability now available at the Jansky Very Large Array (JVLA), we can study changes in polarization properties, fractional polarization, and polarization angles, together with the total intensity spectra of a sample of 14 AGNs, within a frequency range from 1 to 12 GHz. Depolarization modeling has been performed by means of so-called “qu-fitting” to the polarized data, and a synchrotron self absorption model has been used for fitting to the total intensity data. We found complex behavior both in the polarization spectra and in the total intensity spectra, and several Faraday components with a large rotation measure (RM) and several synchrotron components were needed to represent these spectra. Here, results for three targets are shown. This new method of analyzing broadband polarization data through qu-fitting successfully maps the complex surroundings of unresolved objects. View Full-Text
Keywords: polarization; spectro-polarimetric study; qu-fitting; AGN surroundings polarization; spectro-polarimetric study; qu-fitting; AGN surroundings
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Pasetto, A.; Carrasco-González, C.; O’Sullivan, S.; Basu, A.; Bruni, G.; Kraus, A.; Curiel, S.; Mack, K.-H. Probing the Large Faraday Rotation Measure Environment of Compact Active Galactic Nuclei. Galaxies 2018, 6, 40.

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