J/MNRAS/550/G117ivo://CDS.VizieR/J/MNRAS/550/G1179CDSMufakharov T.V.Sotnikova Y.V.Vlasyuk V.V.Kudryavtsev D.O.,Pushkarev A.B.Mikhailov A.G.Khabibullina M.L.Kovalev Y.A.,Kovalev Y.Y.Popkov A.V.Erkenov A.K.Spiridonova O.I.Semenova T.A.,Tsybulev P.G.Nezamov D.S.2026-08-08T15:55:29Z2026-08-08T16:54:00ZCDS support team

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

cds-question@unistra.frquasarsbl-lacertae-objectsphotometryvisible-astronomyradio-continuum-emissionWe present the multiwavelength variability of the BL Lac object PKS 0735+178, associated with the high-energy neutrino event IC211208A. The light curves cover the radio (1-230GHz), optical, and Fermi-LAT gamma-ray bands over a 30yr time-scale. The light curves are correlated, with delays from 0 to 1200d increasing towards lower frequencies, consistent with emission from an opacity-stratified jet. The bright flare after the IC211208A event indicates emission from a compact, optically thick region with enhanced activity and more efficient particle acceleration. Short optical and gamma-ray bursts have been detected very close to the neutrino event, within a few days. The 12-d lag between the gamma-ray and optical emissions is detected for the first time, suggesting that the emission regions are not co-spatial. A characteristic variability time-scale of ~10-11yr is robustly detected in the radio-mm bands (>=3{sigma}), while the optical and gamma-ray data show weaker, shorter period signals. The independent constraints from the VLBI core-shift measurements and radio time delays yield consistent estimates of the jet geometry and disturbance propagation, supporting variability governed by jet propagation effects. The long-term modulation is consistent with a slow variation in energy release at the jet base, while individual flares arise from shocks propagating downstream. Jet precession may contribute to the long-term modulation; however, the required viewing angles are inconsistent with the VLBI constraints, indicating that precession alone cannot explain the observed variability.2026MNRAS.550g1179Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/550/G1179CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/550/G1179https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/550/G1179http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/550/G1179https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/550/G1179https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/550/G1179http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/550/G1179GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalRadiodefaultJ/MNRAS/550/G1179/ratanRATAN-600 radio flux densities, 1997-2026 (Table 2)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateObservation date (YYYY-MM-DD)time.epoch;obsnullableJDJulian Datedtime.epochintYearDecimal yearyrtimedoubleS22? Flux density in the nominal 22-GHz band (1)Jyphot.flux.density;em.radio.12-30GHzfloatnullablee_S22? Uncertainty in S22Jystat.errorfloatnullableS11? Flux density in the nominal 11-GHz band (1)Jyphot.flux.density;em.radio.6-12GHzfloatnullablee_S11? Uncertainty in S11Jystat.errorfloatnullableS8? Flux density in the nominal 8-GHz band (1)Jyphot.flux.density;em.radio.6-12GHzfloatnullablee_S8? Uncertainty in S8Jystat.errorfloatnullableS5? Flux density in the nominal 5-GHz band (1)Jyphot.flux.density;em.radio.3-6GHzfloatnullablee_S5? Uncertainty in S5Jystat.errorfloatnullableS2? Flux density in the nominal 2-GHz band (1)Jyphot.flux.density;em.radio.1500-3000MHzfloatnullablee_S2? Uncertainty in S2Jystat.errorfloatnullableS1? Flux density in the nominal 1-GHz band (1)Jyphot.flux.density;em.radio.750-1500MHzfloatnullablee_S1? Uncertainty in S1Jystat.errorfloatnullableJ/MNRAS/550/G1179/opticSAO RAS R-band flux densities, 2022-2026 (Table 3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateObservation date (YYYY-MM-DD)time.epoch;obsnullableJDJulian Datedtime.epochintYearDecimal yearyrtimedoubleFRR-band flux densitymJyphot.flux.density;em.opt.Rfloate_FRUncertainty in FRmJystat.errorfloatTelOptical telescope code (1)meta.code;instr.telchar