J/ApJ/747/63ivo://CDS.VizieR/J/ApJ/747/63doi:10.26093/cds/vizier.17470063CDSAgudo I.Marscher A.P.Jorstad S.G.Gomez J.L.Perucho M.Piner B.G.,Rioja M.Dodson R.2017-06-27T06:38:49Z2013-10-24T12:08:59ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsmillimeter-astronomysubmillimeter-astronomyradio-continuum-emissionWe present the results from an ultra-high-resolution 7 mm Very Long Baseline Array study of the relativistic jet in the BL Lacertae object OJ287 from 1995 to 2011 containing 136 total intensity images. Analysis of the image sequence reveals a sharp jet-position-angle swing by >100{deg} during [2004,2006], as viewed in the plane of the sky, which we interpret as the crossing of the jet from one side of the line of sight to the other during a softer- and longer-term swing of the inner jet. Modulating such long-term swing, our images also show for the first time a prominent erratic wobbling behavior of the innermost ~0.4 mas of the jet with fluctuations in position angle of up to ~40{deg} over timescales ~2 yr. This is accompanied by highly superluminal motions along non-radial trajectories, which reflect the remarkable non-ballistic nature of the jet plasma on these scales. The erratic nature and short timescales of the observed behavior rule out scenarios such as binary black hole systems, accretion disk precession, and interaction with the ambient medium as possible origins of the phenomenon on the scales probed by our observations, although such processes may cause longer-term modulation of the jet direction. We propose that variable asymmetric injection of the jet flow, perhaps related to turbulence in the accretion disk, coupled with hydrodynamic instabilities leads to the non-ballistic dynamics that causes the observed non-periodic changes in the direction of the inner jet.2012ApJ...747...63Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/747/63CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/MNRAS/421/1861 : OJ287 polarization and VLBI jet direction (Valtonen+, 2012)J/ApJ/742/27 : 15GHz and jet properties of MOJAVE blazars (Lister+, 2011)J/AJ/141/65 : BATC ceimo light curves of OJ 287 (Dai+, 2011)J/ApJS/189/1 : A 3.5mm polarimetric survey of radio-loud AGNs (Agudo+, 2010)J/MNRAS/402/2087 : OJ287 optical polarization in 2005-2009 (Villforth+, 2010)J/ApJ/707/L56 : VLBI and bright Fermi/LAT sources (Kovalev, 2009)J/ApJ/706/1253 : MOJAVE VII. Blazar jet acceleration (Homan+, 2009)J/AJ/138/1874 : MOJAVE. VI. Kinematic analysis of blazar jets (Lister+, 2009)J/AJ/137/3718 : 15GHz monitoring of AGN jets with VLBA (Lister+, 2009)J/MNRAS/385/823 : UBVRI light curves of OJ 287 (Zheng+, 2008)J/AJ/134/799 : Multiwaveband polarimetry of 15 AGN (Jorstad+, 2007)J/AJ/133/2357 : Relativistic jets in the RRFID database (Piner+, 2007)J/A+A/466/63 : VLBI observations of BL Lac objects (Wu+, 2007)J/AJ/132/1256 : eim BATC photometry of OJ 287 (Wu+, 2006)J/AJ/131/1262 : Circular polarization images of AGN jets (Homan+, 2006)J/A+A/450/39 : BVRI photometry of 8 red blazars (Gu+, 2006)J/AJ/130/1418 : AGN jet kinematics (Jorstad+, 2005)J/AJ/130/1389 : Linear polarization of AGN jets at 15GHz (Lister+, 2005)J/ApJ/522/846 : Optical monitoring of GeV loud blazars (Xie+, 1999)J/A+AS/136/455 : BVRI photometry of 3 BL Lac objects (Bai+, 1999)J/A+AS/132/83 : BVRI photometry of 7 BL Lac objects (Bai+ 1998)J/A+AS/129/569 : BVRI photometry of OJ 287 (Jia Guibin+ 1998)J/A+AS/122/271 : mm-monitoring of radio sources IV. (Reuter+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/747/63https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/747/63http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/747/63https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/747/63https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/747/63http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/747/63GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.8377799047813437e-23 2.8377799047813437e-23RadiodefaultJ/ApJ/747/63/table1Observing log and image informationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of the observationtime.epochnullableprimaryTint[12/110] Total integration timemintime.epochintBit[1/2] Bit samplingmeta.noteintDnu[32/128] Observing frequency bandwidthMHzphys.velocintSint[0.8/10.2] Integrated flux density (at 7mm)Jyphot.flux.density;em.mm.30-50GHzfloatSpeak[0.3/7.1] Peak flux density (in Jy/beam)Jyphot.flux.density;em.mm.30-50GHzfloatNoise[0.5/4.4] Image noise level (in mJy/beam)mJyinstr.det.noise;obs.imagefloatRefReferences(s) (1)meta.refcharJ/ApJ/747/63/table2Model fit parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of the observationtime.epochnullableComp[A-Wa-p] Jet feature (see Figure 1)meta.code.multipcharS[3/8132] Flux density (at 7mm)mJyphot.flux.density;em.mm.30-50GHzinte_S[0/548] Uncertainty in SmJystat.errorintr[0/1.6] Distance to the coremaspos.angDistancefloate_rUncertainty in rmasstat.errorfloattheta[-148/174] Position angle {theta}degpos.posAnginte_thetaUncertainty in thetadegstat.error;pos.posAngintFWHM[0/0.9] Full-Width at Half-Maximum of Gaussianmasphys.angSizefloate_FWHMUncertainty in FWHMmasstat.error;phys.angSizefloat