J/A+A/712/A244ivo://CDS.VizieR/J/A+A/712/A244CDSHovatta T.O'Sullivan S.P.Marti-Vidal I.Savolainen T.2026-08-28T09:04:37Z2026-08-28T10:03:03ZCDS support team

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

cds-question@unistra.frquasarspolarimetrymagnetic-fieldsPolarization observations at millimeter wavelengths can be used to study magnetized plasma in jets launched by supermassive black holes. We used multiband Atacama Large Millimeter Array (ALMA) data to study the polarization structure of both the nucleus and the kiloparsec-scale jet of the archetypal quasar 3C 273. We modeled the wavelength-dependent polarization of the nucleus using multiband observations (2, 1.3, and 0.85mm) and applied QU-fitting to constrain Faraday rotation models with one or more polarized components. We also produced total intensity and polarization maps of the kiloparsec-scale jet to study the evolution of the magnetic field structure along and across the jet. The data of the nucleus were best fit by two Faraday components: a high rotation measure (RM) component with RM=+(2.6_/-0.1)*10^5^rad/m^2^ and comparable RM dispersion, and a second component with RM=+(1.5+/-0.2)*10^4^rad/m^2^ and lower dispersion. The high RM is comparable to previous ALMA observations at 1.3mm, although we found clear evidence of variability when compared to previous single-band ALMA studies, highlighting the importance of broad wavelength coverage. On kiloparsec scales, the millimeter polarization structure closely resembled that observed at centimeter wavelengths, revealing a complex magnetic field configuration around the jet head and brightest hotspot region. Our results indicate a multicomponent, time-variable Faraday screen in the nuclear region of 3C 273 that is likely associated with a dense, magnetized environment close to the jet base. Future spatially resolved millimeter polarimetry with the Event Horizon Telescope will be crucial to disentangling these components and directly localizing the high-RM emission region.2026A&A...712A.244Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/712/A244CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/213/26 : Optical light curves of PHL1811 and 3C273 (Fan+, 2014)J/A+A/601/A35 : High-fidelity VLA imaging of 3C273 (Perley+, 2017)J/A+A/623/A111 : 3C273 polarization over ALMA 1.3mm band (Hovatta+, 2019)J/ApJ/876/49 : A 10yr reverberation mapping campaign for 3C273 (Zhang+, 2019)J/A+A/636/A62 : Light curves of 3C273 during 2015-2019 (Kim+, 2020)J/A+A/683/L5 : FITS images of 3C 273 host galaxy (Ren+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/712/A244https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/712/A244http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/712/A244https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/712/A244https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/712/A244http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/712/A244GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/712/A244/list (List of fits Stokes I, Q, and U maps)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/712/A244/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/712/A244/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/712/A244/list?GETtext/xml+votable180.050000true187.271492.047820.0055555555555555566/26292https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/712/A244?format=asciidefaultJ/A+A/712/A244/poldataStokes parameters and polarization valuesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateObserving datetime.epochnullableFreqObserving frequencyGHzem.freqIStokes IJyphot.flux.densityfloate_IStokes I uncertaintyJystat.errorfloatQStokes QJyphot.flux.densityfloate_QStokes Q uncertaintyJystat.errorfloatUStokes UJyphot.flux.densityfloate_UStokes U uncertaintyJystat.error;pos.cartesian.xfloatpFractional polarization%phys.polarizationfloate_pFractional polarization uncertainty%stat.errorfloatEVPAPolarization angledegpos.posAng;phys.polarizationfloate_EVPAPolarization angle uncertaintydegstat.errorfloatJ/A+A/712/A244/listList of fits Stokes I, Q, and U mapsrecnoRecord 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;obsnullableFreqObserved frequencyGHzem.freqfloatsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar