J/A+A/709/A89ivo://CDS.VizieR/J/A+A/709/A89CDSMadika E.Boccardi B.Ricci L.Grandi P.Torresi E.Giovannini G.,Kadler M.Zensus J.A.2026-05-19T14:14:26Z2026-05-05T08:21:35ZCDS support team

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

cds-question@unistra.frradio-galaxiesinterferometryWe present a comprehensive multifrequency VLBI analysis of the FRII high-excitation radio galaxy 3C 452, aiming to resolve and analyse for the first time its twin-jet structure on sub-parsec scales. Our dataset comprises High Sensitivity Array (HSA) observations at 4.9, 8.4, 15.4, 23.6, and 43.2GHz. Using fitting methods applied in both the visibility and image planes, we traced the jet expansion from scales of a few thousand up to nearly 10^5^ Schwarzschild radii on both the approaching and receding jets. Our study provides the first detailed description of the twin-jet system in 3C 452 on VLBI scales. Both jet and counter-jet are resolved down to scales of a few thousand Schwarzschild radii, revealing a symmetric parabolic expansion with power-law indices k~0.66 for the jet and k~0.47 for the counter-jet. The jet-to-counter-jet intensity ratio remains nearly constant on larger scales but increases sharply within the inner 1-1.5mas. The brightness temperature analysis yields low Doppler factors indicating Doppler de-boosting due to the large viewing angle and/or a magnetically dominated jet base.2026A&A...709A..89Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/709/A89CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/709/A89https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/709/A89http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/709/A89https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/709/A89https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/709/A89http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/709/A89GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/709/A89/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/709/A89/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/709/A89/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/709/A89/list?GETtext/xml+votable180.050000true341.4531939.687750.0055555555555555566/13707https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/709/A89?format=asciiRadiodefaultJ/A+A/709/A89/listList of fits imagesrecnoRecord 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 frequencyHzem.freqdoublesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar