J/A+A/709/A50ivo://CDS.VizieR/J/A+A/709/A50CDSKovalev Y.Y.Aller M.F.Erkenov A.K.Gomez J.L.Homan D.C.,Kivokurtseva P.I.Kovalev Yu.A.Lister M.L.de la Parra P.V.,Plavin A.V.Popkov A.V.Pushkarev A.B.Readhead A.C.S.,Shablovinskaia E.Sotnikova Yu.V.Spiridonova O.I.Troitsky S.V.,Vlasyuk V.V.2026-05-19T14:14:26Z2026-05-01T11:59:20ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiradio-galaxiesradio-continuum-emissionvery-long-baseline-interferometryneutrino-astronomyThe physical mechanisms driving neutrino and electromagnetic flares in blazars remain poorly understood. We investigate a prominent multimessenger flare in the quasar PKS 0446+11 to identify the processes responsible for its high-energy emission. We analyzed the IceCube-240105A high-energy neutrino event together with contemporaneous observations in the gamma-ray, X-ray, optical, and radio bands. We modeled the on- and off-flare spectral energy distributions (SEDs) within a single-zone leptohadronic framework. Multi-epoch VLBA observations from the MOJAVE program provide parsec-scale polarization data that complement the multiwavelength light curves. No significant time delay was detected between the neutrino arrival and the flares in different energy bands. This is consistent with an extremely small jet viewing angle below 1 deg, inferred from the parsec-scale polarization structure. The flare can be reproduced by the injection of a proton population and an increase in the Doppler factor from 18 to 24. We also detected an approximately 90 deg rotation of the EVPA in the parsec-scale core during the initial phase of the flare, indicating the emergence of a shock formed by the change in the bulk plasma speed. Our comprehensive multimessenger analysis demonstrates that the extreme beaming and subdegree viewing angle of this distant blazar can account for the observed neutrino and electromagnetic activity. These findings strengthen the case for blazars as efficient accelerators of hadrons and significant contributors to the observed high-energy neutrino flux.2026A&A...709A..50Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/709/A50CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/234/12 : MOJAVE XV. VLBA obs. of AGN jets 1996-2016 (Lister+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/709/A50https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/709/A50http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/709/A50https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/709/A50https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/709/A50http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/709/A50GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/709/A50/list (List of fits polarization maps)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/709/A50/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/709/A50/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/709/A50/list?GETtext/xml+votable180.050000true72.2819611.357940.0055555555555555566/1701https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/709/A50?format=asciiRadiodefaultJ/A+A/709/A50/listList of fits polarization 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;obsnullableFreq[15.368] Observed frequencyGHzem.freqfloatsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar