Optical circular polarization in quasars

Hutsemekers, Damien; Borguet, Benoît; Sluse, Dominique; Cabanac, R.; Lamy, Hervé

doi:10.1051/0004-6361/201015359

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Optical circular polarization in quasars

Hutsemekers, Damien; Borguet, Benoît; Sluse, Dominique et al.

2010 • In Astronomy and Astrophysics, 520 (Letters), p. 7, pp. 1-5

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https://hdl.handle.net/2268/80847

DOI
10.1051/0004-6361/201015359

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Keywords :

quasars: general; polarization

Abstract :

[en] We present new optical circular polarization measurements with typical uncertainties <0.1% for a sample of 21 quasars. All but two objects have null circular polarization. We use this result to constrain the polarization due to photon-pseudoscalar mixing along the line of sight. We detect significant (> 3σ) circular polarization in two blazars with high linear polarization and discuss the implications of this result for quasar physics. In particular, the recorded polarization degrees may be indicative of magnetic fields as strong as 1 kG or a significant contribution of inverse Compton scattering to the optical continuum. Based on observations made with ESO Telescopes at the La Silla Observatory (Chile). ESO program ID: 79.A-0625(B).Appendices are only available in electronic form at http://www.aanda.org

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Hutsemekers, Damien ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)

Borguet, Benoît ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image

Sluse, Dominique ; Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr. 12-14, 69120 Heidelberg, Germany

Cabanac, R.; Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, 57 avenue d'Azereix, 65000 Tarbes, France

Lamy, Hervé ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)

Language :

English

Title :

Optical circular polarization in quasars

Publication date :

01 September 2010

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, France

Volume :

520

Issue :

Letters

Pages :

7, pp. 1-5

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://adsabs.harvard.edu/abs/2010A%26A...520L...7H

Commentary :

http://de.arxiv.org/abs/1009.4049

Available on ORBi :

since 04 January 2011

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