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Galaxies 2017, 5(4), 93; doi:10.3390/galaxies5040093

Linear Polarization Properties of Parsec-Scale AGN Jets

1
Crimean Astrophysical Observatory, Crimea, 98409 Nauchny, Russia
2
Astro Space Center of Lebedev Physical Institute, Profsoyuznaya 84/32, 117997 Moscow, Russia
3
Moscow Institute of Physics and Technology, Dolgoprudny, Institutsky per., 9, 141700 Moscow Region, Russia
4
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
5
Department of Physics and Astronomy, Purdue University, 525 Northwestern Avenue, West Lafayette, IN 47907, USA
6
Metsähovi Radio Observatory, Aalto University, Metsähovintie 114, FI-02540 Kylmälä, Finland
7
Department of Electronics and Nanoengineering, Aalto University, PL 15500, FI-00076 Aalto, Finland
8
Department of Astronomy, University of Michigan, 311 West Hall, 1085 S. University Avenue, Ann Arbor, MI 48109, USA
This paper is an extended version of our paper published in Polarised Emission from Astrophysical Jets.
*
Author to whom correspondence should be addressed.
Received: 6 October 2017 / Revised: 21 November 2017 / Accepted: 27 November 2017 / Published: 1 December 2017
(This article belongs to the Special Issue Polarised Emission from Astrophysical Jets)
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Abstract

We used 15 GHz multi-epoch Very Long Baseline Array (VLBA) polarization sensitive observations of 484 sources within a time interval 1996–2016 from the MOJAVE program, and also from the NRAO data archive. We have analyzed the linear polarization characteristics of the compact core features and regions downstream, and their changes along and across the parsec-scale active galactic nuclei (AGN) jets. We detected a significant increase of fractional polarization with distance from the radio core along the jet as well as towards the jet edges. Compared to quasars, BL Lacs have a higher degree of polarization and exhibit more stable electric vector position angles (EVPAs) in their core features and a better alignment of the EVPAs with the local jet direction. The latter is accompanied by a higher degree of linear polarization, suggesting that compact bright jet features might be strong transverse shocks, which enhance magnetic field regularity by compression. View Full-Text
Keywords: active galactic nuclei; relativistic jets; linear polarization; radio interferometry active galactic nuclei; relativistic jets; linear polarization; radio interferometry
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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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MDPI and ACS Style

Pushkarev, A.B.; Kovalev, Y.Y.; Lister, M.L.; Savolainen, T.; Aller, M.F.; Aller, H.D.; Hodge, M.A. Linear Polarization Properties of Parsec-Scale AGN Jets. Galaxies 2017, 5, 93.

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