J/MNRAS/421/1861ivo://CDS.VizieR/J/MNRAS/421/1861doi:10.26093/cds/vizier.74211861CDSValtonen M.J.Wiik K.2024-07-16T20:12:51Z2013-04-05T14:46:42ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frbl-lacertae-objectspolarimetryWe study the variation of the optical polarization angle in the blazar OJ287 and compare it with the precessing binary black hole model with a "live" accretion disc. First, a model of the variation of the jet direction is calculated, and the main parameters of the model are fixed by the long-term optical brightness evolution. Then this model is compared with the variation of the parsec-scale radio jet position angle in the sky. Finally, the variation of the polarization angle is calculated using the same model, but using a magnetic field configuration which is at a constant angle relative to the optical jet. It is found that the model fits the data reasonably well if the field is almost parallel to the jet axis. This may imply a steady magnetic field geometry, such as a large-scale helical field.2012MNRAS.421.1861Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/421/1861CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/129/569 : BVRI photometry of OJ 287 (Jia Guibin+ 1998)J/AJ/132/1256 : eim BATC photometry of OJ 287 (Wu+, 2006)J/AJ/141/65 : BATC ceimo light curves of OJ 287 (Dai+, 2011)J/MNRAS/385/823 : UBVRI light curves of OJ 287 (Zheng+, 2008)J/MNRAS/402/2087 : Optical polarization of OJ 287 in 2005-09 (Villforth+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/421/1861https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/421/1861http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/421/1861https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/421/1861https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/421/1861http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/421/1861GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/MNRAS/421/1861/table2Historical data showing the mean direction of OJ287's VLBI jet within the first 1mas from the corerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsObservation dateyrtime.epoch;obsfloatn_ObsDay of Obs (1)meta.notecharArrayArray (2)meta.notecharlambdaWavelength used at VLBIcmem.wl.effectivefloatPA[-140/130] Position angle of jetdegpos.posAnginte_PA? rms uncertainty in PA (3)degstat.errorintnullableRefReference (4)meta.ref;pos.frameintn_Ref[d] d: Data model-fitted by T.Savolainen.meta.notechar