Multifrequency polarization properties of blazars

S. Jorstad; A. Marscher; J. Stevens; P. Smith; J. Forster; M. Lister; A. Stirling; J. Gómez; T. Cawthorne; W. Gear; I. Robson

doi:10.1088/1009-9271/6/s1/31

Multifrequency polarization properties of blazars

S. Jorstad, A. Marscher, J. Stevens, P. Smith, J. Forster, M. Lister, A. Stirling, J. Gómez, T. Cawthorne, W. Gear, I. Robson

Steward Observatory

Research output: Contribution to journal › Conference article › peer-review

6 Scopus citations

Abstract

We report preliminary results of a 3-year multifrequency polarization campaign of 15 AGNs of blazar type, including bimonthly total and polarized intensity imaging at 7 mm with the VLBA. We find that the sources have two different dependences of degree of polarization on wavelength: sub-mm peaked or straight "polarization spectra". The fractional polarization of the latter group increases with frequency. All sources with sub-mm peak polarization (6 objects) have similar degree of polarization in the optical region and in the VLBA core. In high-optically polarized sources (5 objects) the EVPAs at all frequencies align with the pc-scale jet direction within the 1σ uncertainties. This implies that the high frequency emission is co-spatial with the VLBI core and/or transverse shocks in the jet.

Original language	English (US)
Pages (from-to)	247-252
Number of pages	6
Journal	Chinese Journal of Astronomy and Astrophysics
Volume	6
Issue number	SUPPL. 1
DOIs	https://doi.org/10.1088/1009-9271/6/s1/31
State	Published - 2006
Event	6th International Workshop on Multifrequency Behaviour of High Energy Cosmic Sources: Frascati Workshop 2005 - Vulcano, Italy Duration: May 23 2005 → May 28 2005

Keywords

3C 120)
3C 273
3C 279
3C 345
3C 454.3)
Active
BL Lac)
CTA 102
Galaxies: BL Lacertae objects: individual (3C 66A
Galaxies: individual (3C 111
Galaxies: jet
Galaxies: quasars: individual (0420-014
OJ 287
PKS 1510-089

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/1009-9271/6/s1/31

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title = "Multifrequency polarization properties of blazars",

abstract = "We report preliminary results of a 3-year multifrequency polarization campaign of 15 AGNs of blazar type, including bimonthly total and polarized intensity imaging at 7 mm with the VLBA. We find that the sources have two different dependences of degree of polarization on wavelength: sub-mm peaked or straight {"}polarization spectra{"}. The fractional polarization of the latter group increases with frequency. All sources with sub-mm peak polarization (6 objects) have similar degree of polarization in the optical region and in the VLBA core. In high-optically polarized sources (5 objects) the EVPAs at all frequencies align with the pc-scale jet direction within the 1σ uncertainties. This implies that the high frequency emission is co-spatial with the VLBI core and/or transverse shocks in the jet.",

keywords = "3C 120), 3C 273, 3C 279, 3C 345, 3C 454.3), Active, BL Lac), CTA 102, Galaxies: BL Lacertae objects: individual (3C 66A, Galaxies: individual (3C 111, Galaxies: jet, Galaxies: quasars: individual (0420-014, OJ 287, PKS 1510-089",

author = "S. Jorstad and A. Marscher and J. Stevens and P. Smith and J. Forster and M. Lister and A. Stirling and J. G{\'o}mez and T. Cawthorne and W. Gear and I. Robson",

year = "2006",

doi = "10.1088/1009-9271/6/s1/31",

language = "English (US)",

volume = "6",

pages = "247--252",

journal = "Chinese Journal of Astronomy and Astrophysics",

issn = "1009-9271",

publisher = "Kexue Chubaneshe/Science Press",

number = "SUPPL. 1",

note = "6th International Workshop on Multifrequency Behaviour of High Energy Cosmic Sources: Frascati Workshop 2005 ; Conference date: 23-05-2005 Through 28-05-2005",

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TY - JOUR

T1 - Multifrequency polarization properties of blazars

AU - Jorstad, S.

AU - Marscher, A.

AU - Stevens, J.

AU - Smith, P.

AU - Forster, J.

AU - Lister, M.

AU - Stirling, A.

AU - Gómez, J.

AU - Cawthorne, T.

AU - Gear, W.

AU - Robson, I.

PY - 2006

Y1 - 2006

N2 - We report preliminary results of a 3-year multifrequency polarization campaign of 15 AGNs of blazar type, including bimonthly total and polarized intensity imaging at 7 mm with the VLBA. We find that the sources have two different dependences of degree of polarization on wavelength: sub-mm peaked or straight "polarization spectra". The fractional polarization of the latter group increases with frequency. All sources with sub-mm peak polarization (6 objects) have similar degree of polarization in the optical region and in the VLBA core. In high-optically polarized sources (5 objects) the EVPAs at all frequencies align with the pc-scale jet direction within the 1σ uncertainties. This implies that the high frequency emission is co-spatial with the VLBI core and/or transverse shocks in the jet.

AB - We report preliminary results of a 3-year multifrequency polarization campaign of 15 AGNs of blazar type, including bimonthly total and polarized intensity imaging at 7 mm with the VLBA. We find that the sources have two different dependences of degree of polarization on wavelength: sub-mm peaked or straight "polarization spectra". The fractional polarization of the latter group increases with frequency. All sources with sub-mm peak polarization (6 objects) have similar degree of polarization in the optical region and in the VLBA core. In high-optically polarized sources (5 objects) the EVPAs at all frequencies align with the pc-scale jet direction within the 1σ uncertainties. This implies that the high frequency emission is co-spatial with the VLBI core and/or transverse shocks in the jet.

KW - 3C 120)

KW - 3C 273

KW - 3C 279

KW - 3C 345

KW - 3C 454.3)

KW - Active

KW - BL Lac)

KW - CTA 102

KW - Galaxies: BL Lacertae objects: individual (3C 66A

KW - Galaxies: individual (3C 111

KW - Galaxies: jet

KW - Galaxies: quasars: individual (0420-014

KW - OJ 287

KW - PKS 1510-089

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U2 - 10.1088/1009-9271/6/s1/31

DO - 10.1088/1009-9271/6/s1/31

M3 - Conference article

AN - SCOPUS:84891838155

SN - 1009-9271

VL - 6

SP - 247

EP - 252

JO - Chinese Journal of Astronomy and Astrophysics

JF - Chinese Journal of Astronomy and Astrophysics

IS - SUPPL. 1

T2 - 6th International Workshop on Multifrequency Behaviour of High Energy Cosmic Sources: Frascati Workshop 2005

Y2 - 23 May 2005 through 28 May 2005

ER -

Multifrequency polarization properties of blazars

Abstract

Keywords

ASJC Scopus subject areas

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