Linear polarization properties of parsec-scale AGN jets

Alexander B. Pushkarev*, Yuri Y. Kovalev, Matthew L. Lister, Tuomas Savolainen, Margo F. Aller, Hugh D. Aller, Mary A. Hodge

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)
151 Downloads (Pure)

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.

Original languageEnglish
Article number93
JournalGalaxies
Volume5
Issue number4
DOIs
Publication statusPublished - 1 Dec 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • Active galactic nuclei
  • Linear polarization
  • Radio interferometry
  • Relativistic jets

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