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<ri:Resource created="2008-04-25T21:40:51Z" status="active" updated="2025-05-19T09:50:00Z" version="1.2" xmlns:cs="http://www.ivoa.net/xml/ConeSearch/v1.0" xmlns:ri="http://www.ivoa.net/xml/RegistryInterface/v1.0" xmlns:vr="http://www.ivoa.net/xml/VOResource/v1.0" xmlns:vs="http://www.ivoa.net/xml/VODataService/v1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.ivoa.net/xml/ConeSearch/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/ConeSearch.xsd http://www.ivoa.net/xml/VOResource/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/VOResource.xsd http://www.ivoa.net/xml/VODataService/v1.1 http://vo.ari.uni-heidelberg.de/docs/schemata/VODataService.xsd" xsi:type="vs:CatalogService"><title>QSO Type1/Type2 dichotomy</title><shortName>J/A+A/478/321</shortName><identifier>ivo://CDS.VizieR/J/A+A/478/321</identifier><altIdentifier>doi:10.26093/cds/vizier.34780321</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Borguet B.</name></creator><creator><name>Hutsemekers D.</name></creator><creator><name>Letawe G.</name></creator><creator><name>Letawe Y.</name></creator><creator><name>Magain P.</name></creator><date role="Updated">2017-10-18T08:25:00Z</date><date role="Created">2008-04-25T21:40:51Z</date><contact><name>CDS support team</name><address>CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France</address><email>cds-question@unistra.fr</email></contact></curation><content><subject>quasars</subject><subject>polarimetry</subject><subject>radio-sources</subject><subject>galaxy-classification-systems</subject><description>For Seyfert galaxies, the AGN unification model provides a simple and well-established explanation of the type 1/type 2 dichotomy through orientation-based effects. The generalization of this unification model to the higher luminosity AGNs that quasars are remains a key question. The recent detection of type 2 radio-quiet quasars seems to support such an extension. We propose a further test of this scenario. On the basis of a compilation of quasar host-galaxy position angles consisting of previously published data and of new measurements performed using HST Archive images, we investigate the possible existence of a correlation between the linear polarization position angle and the host-galaxy/extended emission position angle of quasars.</description><source format="bibcode">2008A&amp;A...478..321B</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/478/321</referenceURL><type>Catalog</type><contentLevel>Research</contentLevel><relationship><relationshipType>IsServedBy</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/TAP">TAP VizieR generic service</relatedResource></relationship><relationship><relationshipType>IsServedBy</relationshipType><relatedResource>Conesearch service</relatedResource></relationship><relationship><relationshipType>related-to</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/122/81">J/ApJS/122/81 : HST snapshot survey of 3CR radio sources (Martel+, 1999)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+AS/142/451">J/A+AS/142/451 : Optical Polarization of 47 QSOs (Lamy+, 2000)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/569/23">J/ApJ/569/23 : Optical polarisation of 2MASS QSOs (Smith+, 2002)</relatedResource></relationship></content><rights>https://cds.unistra.fr/vizier-org/licences_vizier.html</rights><capability><interface xsi:type="vr:WebBrowser"><accessURL use="full">https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/478/321</accessURL><mirrorURL title="VizieR at IUCAA: Pune, India">https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/478/321</mirrorURL><mirrorURL title="VizieR at SAAO: SAAO, South Africa">http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/478/321</mirrorURL></interface></capability><capability><interface xsi:type="vs:ParamHTTP"><accessURL 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