Multiwavelength variability of the high-energy neutrino candidate PKS 0735+178 over three decades
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ID: 318324
2026
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Abstract
Abstract We 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 (1–230 GHz), optical, and Fermi-LAT γ-ray bands over a ~30 years time-scale. The light curves are correlated, with delays from 0 to 1200 days 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 γ-ray bursts have been detected very close to the neutrino event, within a few days. The ~12-day lag between the γ-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 ~10–11 yr is robustly detected in the radio–mm bands (≥3σ), while the optical and γ-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.
| Reference Key |
openalex_W7165681698
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| Authors | T V Mufakharov, Yu V Sotnikova, V V Vlasyuk, D. O. Kudryavtsev, A. B. Pushkarev, A G Mikhailov, М. Л. Хабибуллина, Yu A Kovalev, Y. Y. Kovalev, A V Popkov, A K Erkenov, O I Spiridonova, T A Semenova, P G Tsybulev, D S Nezamov |
| Journal | monthly notices of the royal astronomical society |
| Year | 2026 |
| DOI |
10.1093/mnras/stag1179
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| URL | |
| Keywords | Keywords not found |
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