J/ApJ/672/40ivo://CDS.VizieR/J/ApJ/672/40doi:10.26093/cds/vizier.16720040CDSHagen-Thorn T.A.Larionov V.M.Jorstad S.G.Arkharov A.A.,Hagen-Thorn E.I.Efimova N.V.Larionova L.V.Marscher A.P.2017-06-27T06:38:12Z2010-06-04T16:13:58ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsinfrared-photometryvisible-astronomybroad-band-photometrypolarimetryWe present the results of polarimetric (R-band) and multicolor photometric (BVRIJHK) observations of the blazar AO 0235+16 during an outburst in 2006 December. The data reveal a short timescale of variability (several hours), which increases from optical to near-IR wavelengths; even shorter variations are detected in polarization. The flux density correlates with the degree of polarization, and at the maximum degree of polarization the electric vector tends to align with the parsec-scale jet direction. We find that a variable component with a steady power-law spectral energy distribution and very high optical polarization (30%-50%) is responsible for the variability. We interpret these properties of the blazar within a model of a transverse shock propagating down the jet. In this case a small change in the viewing angle of the jet, by ~<1{deg}, and a decrease in the shocked plasma compression by a factor of ~1.5 are sufficient to account for the variability.2008ApJ...672...40Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/672/40CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/672/40https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/672/40http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/672/40https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/672/40https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/672/40http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/672/40GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/672/40/table2Near-IR dataJDK? Julian Date of K band observationdtime.epochdoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJJulian Date of J band observationdtime.epochdoubleJmagThe J band magnitudemagphot.mag;em.IR.Jfloate_JmagUncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatJDHJulian Date of H band observationdtime.epochdoubleHmagThe H band magnitudemagphot.mag;em.IR.Hfloate_HmagUncertainty in Hmagmagstat.error;phot.mag;em.IR.HfloatKmag? The K band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? Uncertainty in Kmagmagstat.error;phot.mag;em.IR.KfloatnullableJ/ApJ/672/40/table3Polarization data in R bandJDJulian Datedtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintpolDegree of polarization%phys.polarizationfloate_polUncertainty in Pol%stat.errorfloatthetaPolarization position angledegpos.posAngfloate_thetaUncertainty in Thetadegstat.error;pos.posAngfloatJ/ApJ/672/40/table1Optical datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDB? Julian Date of B band observationdtime.epochdoublenullableBmag? The B band magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag? Uncertainty in Bmagmagstat.error;phot.mag;em.opt.BfloatnullableJDV? Julian Date of V band observationdtime.epochdoublenullableVmag? The V band magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? Uncertainty in Vmagmagstat.error;phot.mag;em.opt.VfloatnullableJDRJulian Date of R band observationdtime.epochdoubleRmagThe R band magnitudemagphot.mag;em.opt.Rfloate_RmagUncertainty in Rmagmagstat.error;phot.mag;em.opt.RfloatJDI? Julian Date of I band observationdtime.epochdoublenullableImag? The I band magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag? Uncertainty in Imagmagstat.error;phot.mag;em.opt.Ifloatnullable