J/A+A/704/A225ivo://CDS.VizieR/J/A+A/704/A225CDSToscano T.Gomez J.L.Zhao G.-Y.Lico R.Fuentes A.Savolainen T.,Roeder J.Wielgus M.Pushkarev A.B.Traianou E.Zeng A.-L.,Gurvits L.I.Kovalev Y.Y.Poetzl F.M.Lisakov M.2026-03-02T06:25:50Z2025-12-12T09:31:26ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleipolarimetryradio-sourcesvery-long-baseline-interferometryWe present observations of the blazar 3C 279 at 22GHz using the space VLBI mission RadioAstron on 2018 January 15. Images in both total intensity and fractional polarization are reconstructed using RML method implemented in the eht-imaging library. The electric vector position angles are found to be mostly aligned with the general jet direction, suggesting a predominantly toroidal magnetic field, in agreement with the presence of a helical magnetic field. Ground-space fringes were detected up to a projected baseline length of ~8G{lambda}, achieving the angular resolution of around 26uas. The fine-scale structure of the relativistic jet is found in our study extending to a projected distance of ~180 parsec from the radio core. However, the filamentary structure reported by previous RadioAstron observations of 2014 is not detected in our current study. We discuss potential causes for this phenomenon, together with a comparison using public 43GHz data from the BEAM-ME program, showing a significant drop in the jet's total intensity. The optically thick core is observed with a brightness temperature of 1.6x10^12^K, consistent with equipartition between the energy densities of the relativistic particles and the magnetic field. This yields an estimated magnetic field strength of 0.2G.2025A&A...704A.225Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/704/A225CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/409/857 : Optical polarization of 3C 279 (Andruchow+, 2003)J/AJ/133/2866 : 2001-02 optical variability of blazar 3C279 (Kartaltepe+, 2009)J/ApJ/772/13 : VLBI observations of 3C 279 at 230GHz (Lu+, 2013)J/A+A/590/A10 : 3C 279 optical photometry and polarimetry (Kiehlmann+, 2016)J/AJ/151/54 : VRIJHK photometry of 3C 279 (Sandrinelli+, 2016)J/A+A/630/A56 : A gamma-ray emission zone in 3C 279 (Patino-Alvarez+, 2019)J/ApJS/245/18 : 9yr R-band photopolarimetric data of 3C 279 (Fraija+, 2019)J/A+A/640/A69 : 3C 279 Event Horizon Telescope imaging (Kim+, 2020)J/ApJS/257/37 : Blazars 3C279 and 3C454.3 multiwavelength data (Paliya+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/704/A225https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/704/A225http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/704/A225https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/704/A225https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/704/A225http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/704/A225GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/704/A225/list (Information on fits image)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/704/A225/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/704/A225/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/704/A225/list?GETtext/xml+votable180.050000true194.046535.789310.0055555555555555566/26332https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/704/A225?format=asciiRadiodefaultJ/A+A/704/A225/listInformation on fits imagerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation datestime.epoch;obsnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar