J/A+A/709/A92ivo://CDS.VizieR/J/A+A/709/A92CDSParaschos G.F.Liodakis I.Jorstad S.Kovalev Y.Y.Chakraborty S.,Marin F.Ehlert S.R.Traianou E.Debbrecht L.C.Agudo I.Barnouin T.,Casey J.J.Di Gesu L.Kaaret P.Kim D.E.Kislat F.Ratheesh A.,Saade M.L.Tombesi F.Marscher A.Gomez J.-L.Pushkarev A.B.,Savolainen T.Myserlis I.Gurwell M.Keating G.Rao R.Kang S.,Lee S.-S.Kim S.Yeon Cheong W.Jeong H.-W.Song C.Li S.Nam M.-S.,Alvarez-Ortega D.Casadio C.Chen C.-T.Costa E.Churazov E.,Ferrazzoli R.Galanti G.Khabibullin I.O'Dell S.L.Pacciani L.,Roncadelli M.Roberts O.J.Soffitta P.Swartz D.A.Tavecchio F.,Weisskopf M.C.Zhuravleva I.2026-05-19T14:14:26Z2026-05-06T09:10:41ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiinterferometrypolarimetryThe location of gamma-ray creation and emission within extra-galactic jets is a matter of active debate. One particularly well-suited source to pinpoint the location is the nearby, bright radio galaxy 3C 84, harbouring a powerful jet. Here we investigate the origin of gamma-rays measured during a recent gamma-ray flare, by analysing the linear polarisation signal of close-in-time very long baseline interferometry (VLBI) observations at centimetre and millimetre wavelengths. While 3C 84 is overall almost unpolarised, we find that close-in-time to the gamma-ray flare peak regions at parsec-scale distances from the central engine shows a fractional linear polarisation increase. Under the physically well-motivated assumption of a causal relation between this polarisation enhancement and the gamma-ray flare, and combined with insights from concurrent X-ray polarisation measurements, the gamma-rays being created in this region is a physically motivated scenario, in a process consistent with synchrotron self-Compton.2026A&A...709A..92Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/709/A92CatalogResearchIsServedByTAP 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/A92https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/709/A92http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/709/A92https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/709/A92https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/709/A92http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/709/A92GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/709/A92/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/709/A92/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/709/A92/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/709/A92/list?GETtext/xml+votable180.050000true49.9506741.51170.0055555555555555566/1701https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/709/A92?format=asciidefaultJ/A+A/709/A92/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;obsnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar