J/A+A/694/A206ivo://CDS.VizieR/J/A+A/694/A206doi:10.26093/cds/vizier.36940206CDSJormanainen J.Hovatta T.Lindfors E.Berdyugin A.Chamani W.,Fallah Ramazani V.Jermak H.Jorstad S.G.Laehteenmaeki A.McCall C.,Nilsson K.Smith P.Steele I.A.Tammi J.Tornikoski M.Wierda F.2026-08-03T06:54:46Z2025-02-14T10:14:56ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleibl-lacertae-objectspolarimetryvisible-astronomyradio-sourcesmillimeter-astronomysubmillimeter-astronomyOJ 287 is a bright blazar with century-long observations, and one of the strongest candidates to host a supermassive black hole binary. Its polarisation behaviour between 2015 and 2017 (MJD 57300-58000) contains several interesting events that we re-contextualise in this study. We collected optical photometric and polarimetric data from several telescopes and obtained high-cadence light curves from this period. In the radio band, we collected mm-wavelength polarisation data from the AMAPOLA program. We combined these with existing multifrequency polarimetric radio results and the results of very-long-baseline-interferometry imaging with the Global mm-VLBI Array at 86GHz. In December 2015, an optical flare was seen according to the general relativistic binary black hole model. We suggest that the overall activity near the accretion disk and the jet base during this time may be connected to the onset of a new moving component K seen in the jet in March 2017. With the additional optical data, we find a fast polarisation angle rotation of ~210{deg} coinciding with the December 2015 flare, hinting at a possible link between these events. Based on the 86-GHz images, we calculated a new speed of 0.12mas/yr for K, which places it inside the core at the time of the 2015 flare. This speed also supports the scenario where the passage of K through the quasi-stationary feature S1 could have been the trigger for the very-high-energy gamma-ray flare of OJ 287 seen in February 2017. With the mm-polarisation data, we established that these bands follow the cm-band data but show a difference during the time of K passing through S1. This indicates that the mm-bands trace the substructures of the jet still unresolved in the cm-bands.2025A&A...694A.206Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/694/A206CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/619/A88 : OJ287 high cadence polarization monitoring (Myserlis+, 2018)J/A+A/620/A185 : Long-term optical monitoring of TeV Blazars (Nilsson+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/694/A206https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/694/A206http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/694/A206https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/694/A206https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/694/A206http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/694/A206GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalMillimeterRadiodefaultJ/A+A/694/A206/fig1_1Flux densities in radio mm- and cm-bandsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeObservation time (MJD)dtime.epochdoubleFluxFlux densityJyphot.flux.density;em.radiofloate_FluxError of flux densityJystat.error;phot.fluxfloatFreqFrequency (G1)GHzem.freqfloatJ/A+A/694/A206/fig1_2Polarisation degrees in radio mm- and cm-bandsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeObservation time (MJD)dtime.epochdoublePDPolarisation degree%phys.polarizationfloate_PD? Error of PD, not for 97 and 343GHz PD%stat.errorfloatnullableb_PD? Lower limit, only for 97 and 343GHz PD%phys.polarization;stat.minfloatnullableB_PD? Upper limit, only for 97 and 343GHz PD%phys.polarization;stat.maxfloatnullableFreqFrequency (G1)GHzem.freqfloatJ/A+A/694/A206/fig1_3Polarisation angles in radio mm- and cm-bandsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeObservation time (MJD)dtime.epochdoubleEVPAElectric vector polarisation angledegpos.posAng;phys.polarizationdoublee_EVPAError of EVPAdegstat.errorfloatFreqFrequency (G1)GHzem.freqfloatJ/A+A/694/A206/fig2_1Flux densities in optical R-bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeObservation time (MJD)dtime.epochdoubleFluxFlux density in R-bandJyphot.flux.density;em.opt.Rdoublee_FluxError of flux density in R-bandJystat.error;phot.fluxdoubleTelTelescope (1)meta.id;instr.telcharJ/A+A/694/A206/fig2_2Polarisation degrees in optical bandsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeObservation time (MJD)dtime.epochdoublePDPolarisation degree%phys.polarizationfloate_PDError of PD%stat.errorfloatTelTelescope (G2)meta.id;instr.telcharBandBand (G2)instr.bandpasscharJ/A+A/694/A206/fig2_3Polarisation angles in optical bandsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeObservation time (MJD)dtime.epochdoubleEVPAElectric vector polarisation angledegpos.posAng;phys.polarizationdoublee_EVPAError of EVPAdegstat.errorfloatTelTelescope (G2)meta.id;instr.telcharBandBand (G2)instr.bandpasschar