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

doi:10.3390/galaxies5040093

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

^*Tämän työn vastaava kirjoittaja

Tutkimustuotos: Lehtiartikkeli › Article › Scientific › vertaisarvioitu

21 Sitaatiot (Scopus)

180 Lataukset (Pure)

Abstrakti

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.

Alkuperäiskieli	Englanti
Artikkeli	93
Julkaisu	Galaxies
Vuosikerta	5
Numero	4
DOI - pysyväislinkit	https://doi.org/10.3390/galaxies5040093
Tila	Julkaistu - 1 jouluk. 2017
OKM-julkaisutyyppi	A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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10.3390/galaxies5040093Lisenssi: CC BY

savolainen-et-al-galaxies-05-00093
© 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Final published version, 2,49 MBLisenssi: CC BY

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@article{045a297266a34c8c87fc00df4a5b9def,

title = "Linear polarization properties of parsec-scale AGN jets",

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.",

keywords = "Active galactic nuclei, Linear polarization, Radio interferometry, Relativistic jets",

author = "Pushkarev, {Alexander B.} and Kovalev, {Yuri Y.} and Lister, {Matthew L.} and Tuomas Savolainen and Aller, {Margo F.} and Aller, {Hugh D.} and Hodge, {Mary A.}",

year = "2017",

month = dec,

day = "1",

doi = "10.3390/galaxies5040093",

language = "English",

volume = "5",

journal = "Galaxies",

issn = "2075-4434",

publisher = "MDPI AG",

number = "4",

}

TY - JOUR

T1 - Linear polarization properties of parsec-scale AGN jets

AU - Pushkarev, Alexander B.

AU - Kovalev, Yuri Y.

AU - Lister, Matthew L.

AU - Savolainen, Tuomas

AU - Aller, Margo F.

AU - Aller, Hugh D.

AU - Hodge, Mary A.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - 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.

AB - 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.

KW - Active galactic nuclei

KW - Linear polarization

KW - Radio interferometry

KW - Relativistic jets

UR - http://www.scopus.com/inward/record.url?scp=85036632313&partnerID=8YFLogxK

U2 - 10.3390/galaxies5040093

DO - 10.3390/galaxies5040093

M3 - Article

AN - SCOPUS:85036632313

SN - 2075-4434

VL - 5

JO - Galaxies

JF - Galaxies

IS - 4

M1 - 93

ER -

Linear polarization properties of parsec-scale AGN jets

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