A simultaneous 3.5 and 1.3 mm polarimetric survey of active galactic nuclei in the northern sky

Context. Short millimeter observations of radio-loud active galactic nuclei (AGN) offer an excellent opportunity to study the physics of their synchrotron-emitting relativistic jets from where the bulk of radio and millimeter emission is radiated. On one hand, AGN jets and their emission cores are s...

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Detalles Bibliográficos
Autores: Agudo, Iván, Thum, C., Gómez Fernández, José L., Wiesemeyer, H.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2014
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/398955
Acceso en línea:http://hdl.handle.net/10261/398955
Access Level:acceso abierto
Palabra clave:Galaxies: active
Galaxies: jets
Quasars: general
BL Lacertae objects: general
Polarization
Surveys
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spelling A simultaneous 3.5 and 1.3 mm polarimetric survey of active galactic nuclei in the northern skyAgudo, IvánThum, C.Gómez Fernández, José L.Wiesemeyer, H.Galaxies: activeGalaxies: jetsQuasars: generalBL Lacertae objects: generalPolarizationSurveysContext. Short millimeter observations of radio-loud active galactic nuclei (AGN) offer an excellent opportunity to study the physics of their synchrotron-emitting relativistic jets from where the bulk of radio and millimeter emission is radiated. On one hand, AGN jets and their emission cores are significantly less affected by Faraday rotation and depolarization than at longer wavelengths. On the other hand, the millimeter emission of AGN is dominated by the compact innermost regions in the jets, where the jet cannot be seen at longer wavelengths due to synchrotron opacity.Aims. We present the first simultaneous dual frequency 86 GHz and 229 GHz polarimetric survey of all four Stokes parameters for a large sample of 211 radio-loud active galactic nuclei, designed to be flux limited at 1 Jy at 86 GHz.Methods. Most of the observations were made in mid-August 2010 using the XPOL polarimeter on the IRAM 30 m millimetric radio telescope.Results. Linear polarization detections above a 3σ median level of ~ 1.0% are reported for 183 sources at 86 GHz and for 23 sources at 229 GHz, where the median 3σ level is ~ 6.0%. We show a clear excess of the linear polarization degree that is detected at 229 GHz with regard to that at 86 GHz by a factor of ~ 1.6. This implies a progressively better ordered magnetic field for blazar jet regions that are located progressively upstream in the jet. We show that the linear polarization angle at 86 and 229 GHz and the jet structural position angle for both quasars and BL Lacs do not show a clear preference to align in either parallel or perpendicular directions. Our variability study with regard to the 86 GHz data from our previous survey points out a large degree of variation. In particular, we report total flux and linear polarization changes in time scales of years by median factors of ~ 1.5 in total flux and ~ 1.7 in linear polarization degree (with maximum variations by factors up to 6.3 and ~ 5, respectively). Moreover, 86% of sources show linear polarization angles evenly distributed with regard to our previous measurements. © ESO, 2014The authors acknowledge the anonymous referee for his/her constructive revision of this paper, which allowed us to improve it considerably. This paper is based on observations carried out with the IRAM 30 m telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain). The research at the IAA-CSIC is supported in part by the Ministerio de Ciencia e Innovación of Spain, and by the regional government of Andalucía through grants AYA2010-14844 and P09-FQM-4784, respectively. The research at Boston University was funded by US National Science Foundation grant AST-0907893, NASA grants NNX08AJ64G, NNX08AU02G, NNX08AV61G, and NNX08AV65G, and NRAO award GSSP07-0009. This research has made use of the NASA/IPAC Extragalactic Database, the MOJAVE database (Lister et al. 2009), the one by the Blazar Research Group at the Boston University, as well as the USNO Radio Reference Frame Image Database.Peer reviewedEDP SciencesMinisterio de Ciencia e Innovación (España)National Science Foundation (US)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252014info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/398955reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MICINN//AYA2010-14844info:eu-repo/grantAgreement/Junta de Andalucía//P09-FQM-4784http://dx.doi.org/10.1051/0004-6361/201423366Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3989552026-05-22T06:33:51Z
dc.title.none.fl_str_mv A simultaneous 3.5 and 1.3 mm polarimetric survey of active galactic nuclei in the northern sky
title A simultaneous 3.5 and 1.3 mm polarimetric survey of active galactic nuclei in the northern sky
spellingShingle A simultaneous 3.5 and 1.3 mm polarimetric survey of active galactic nuclei in the northern sky
Agudo, Iván
Galaxies: active
Galaxies: jets
Quasars: general
BL Lacertae objects: general
Polarization
Surveys
title_short A simultaneous 3.5 and 1.3 mm polarimetric survey of active galactic nuclei in the northern sky
title_full A simultaneous 3.5 and 1.3 mm polarimetric survey of active galactic nuclei in the northern sky
title_fullStr A simultaneous 3.5 and 1.3 mm polarimetric survey of active galactic nuclei in the northern sky
title_full_unstemmed A simultaneous 3.5 and 1.3 mm polarimetric survey of active galactic nuclei in the northern sky
title_sort A simultaneous 3.5 and 1.3 mm polarimetric survey of active galactic nuclei in the northern sky
dc.creator.none.fl_str_mv Agudo, Iván
Thum, C.
Gómez Fernández, José L.
Wiesemeyer, H.
author Agudo, Iván
author_facet Agudo, Iván
Thum, C.
Gómez Fernández, José L.
Wiesemeyer, H.
author_role author
author2 Thum, C.
Gómez Fernández, José L.
Wiesemeyer, H.
author2_role author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (España)
National Science Foundation (US)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Galaxies: active
Galaxies: jets
Quasars: general
BL Lacertae objects: general
Polarization
Surveys
topic Galaxies: active
Galaxies: jets
Quasars: general
BL Lacertae objects: general
Polarization
Surveys
description Context. Short millimeter observations of radio-loud active galactic nuclei (AGN) offer an excellent opportunity to study the physics of their synchrotron-emitting relativistic jets from where the bulk of radio and millimeter emission is radiated. On one hand, AGN jets and their emission cores are significantly less affected by Faraday rotation and depolarization than at longer wavelengths. On the other hand, the millimeter emission of AGN is dominated by the compact innermost regions in the jets, where the jet cannot be seen at longer wavelengths due to synchrotron opacity.
publishDate 2014
dc.date.none.fl_str_mv 2014
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/398955
url http://hdl.handle.net/10261/398955
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MICINN//AYA2010-14844
info:eu-repo/grantAgreement/Junta de Andalucía//P09-FQM-4784
http://dx.doi.org/10.1051/0004-6361/201423366
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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