J/A+A/710/L33ivo://CDS.VizieR/J/A+A/710/L33CDSGrigoriou S.Glykopoulou A.Liodakis I.2026-06-23T07:39:39Z2026-06-23T07:50:09ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsphotometrypolarimetryvisible-astronomyOptical polarization can be an important probe of particle acceleration and high-energy emission processes in relativistic jets from supermassive black holes. Here, we combine publicly available observations from three past blazar monitoring programs to produce densely sampled light curves for 15 blazars in order to explore the relation of gamma-ray activity to the polarization variability as well as discover new rotations of the polarization angle. We find that polarization degree does not correlate with gamma-ray flux either for individual sources or different sub-samples of blazars, potentially indicating multiple emission mechanisms. In the combined dataset, we identified a total of 64 rotations in 12 sources, 39 of which are newly identified rotations. We confirm the trend of lower polarization degree during periods of polarization angle rotations for the whole sample found in previous works. However, looking at the individual sources, we identified cases where the rotation and non-rotation polarization degree distributions are indistinguishable, providing further evidence for the multiple emission mechanism hypothesis.2026A&A...710L..33Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/710/L33CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/710/L33https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/710/L33http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/710/L33https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/710/L33https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/710/L33http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/710/L33GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/710/L33/sources (List of studied sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/710/L33/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/710/L33/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/710/L33/sources?GETtext/xml+votable180.050000true299.99937565.14850.0055555555555555566/579 2414 4695 7896 9612 13820 13927 15969 19398 20099 26131 28492 31663 31894 44908https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/710/L33?format=asciiOpticaldefaultJ/A+A/710/L33/sourcesList of studied sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameTarget namemeta.id;meta.maincharRAJ2000Simbad right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Simbad declination (J2000)pos.eq.dec;meta.mainLCShow the light curvemeta.ref.urlcharpolShow the linear polarization degree curvemeta.ref.urlcharSNameSimbad namemeta.idcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/710/L33/photCombined multi-telescope photometry datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameTarget namemeta.id;meta.maincharJDJulian date of the observationdtime.epochdoublemag? Magnitude in the observed filter bandmagphot.magfloatnullablee_mag? Uncertainty on magnitude (1)magstat.error;phot.magfloatnullableJ/A+A/710/L33/polCombined multi-telescope polarimetry datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameTarget namemeta.id;meta.maincharJDJulian date of the observationdtime.epochdoublePDLinear polarization degree%phys.polarization.linearfloate_PDThe 1-sigma uncertainty on PD%stat.errorfloatPA[]? Polarization angle (1)degpos.posAng;phys.polarizationfloatnullablee_PA? Uncertainty on PA (2)degstat.errorfloatnullable