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Galaxies 2018, 6(1), 17; https://doi.org/10.3390/galaxies6010017

Constraints on Particles and Fields from Full Stokes Observations of AGN

1
Department of Physics, Denison University, Granville, OH 43023, USA
2
Tuorla Observatory, University of Turku, Väisäläntie 20, 21500 Piikkiö, Finland
3
Astro Space Center of Lebedev Physical Institute, Profsoyuznaya 84/32, 117997 Moscow, Russia
4
Moscow Institute of Physics and Technology, Dolgoprudny, Institutsky per., 9, 141700 Moscow, Russia
5
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
6
Department of Physics and Astronomy, Purdue University, 525 Northwestern Avenue, West Lafayette, IN 47907, USA
7
Crimean Astrophysical Observatory, Crimea, 98409 Nauchny, Russia
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Aalto University Metsähovi Radio Observatory, Metsähovintie 114, 02540 Kylmälä, Finland
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Department of Electronics and Nanoengineering, Aalto University, PL 15500, FI-00076 Aalto, Finland
*
Author to whom correspondence should be addressed.
Received: 14 December 2017 / Revised: 10 January 2018 / Accepted: 10 January 2018 / Published: 29 January 2018
(This article belongs to the Special Issue Polarised Emission from Astrophysical Jets)
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Abstract

Combined polarization imaging of radio jets from Active Galactic Nuclei (AGN) in circular and linear polarization, also known as full Stokes imaging, has the potential to constrain both the magnetic field structure and particle properties of jets. Although only a small fraction of the emission when detected, typically less than a few tenths of a percent but up to as much as a couple of percent in the strongest resolved sources, circular polarization directly probes the magnetic field and particles within the jet itself and is not expected to be modified by external screens. A key to using full Stokes observations to constrain jet properties is obtaining a better understanding of the emission of circular polarization, including its variability and spectrum. We discuss what we have learned so far from parsec scale monitoring observations in the MOJAVE program and from multi-frequency observations of selected AGN. View Full-Text
Keywords: Galaxies; AGN; Quasars; BL Lacertae Objects; non-thermal emission Galaxies; AGN; Quasars; BL Lacertae Objects; non-thermal emission
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Homan, D.C.; Hovatta, T.; Kovalev, Y.Y.; Lister, M.L.; Pushkarev, A.B.; Savolainen, T. Constraints on Particles and Fields from Full Stokes Observations of AGN. Galaxies 2018, 6, 17.

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