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January 23, 2026

Multi-epoch VLBI observations of the blazar 3C 66A: Spatial twisting and temporal oscillation of the parsec-scale jet

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Authors

PTPaloma ThevenetCentre National de la Recherche ScientifiqueJKJeonguk KimKorea Astronomy and Space Science InstituteGZGuang-Yao Zhao

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Implication

High-resolution VLBI seeks to clarify kinematic behavior in the blazar 3C 66A, suggesting a precession model driven by a black hole binary system.

Key Points

  • The study aims to understand the kinematic behavior and physical origins of the jet in the blazar 3C 66A through detailed observations.
  • Conducted multi-epoch VLBI observations at KVN and VERA arrays at 22/43 GHz
  • Analyzed 109 VLBA archival data sets at 43 GHz from 1996 to 2025
  • Employed circular Gaussian fittings to parameterize jet morphology
  • Measured variations in jet position angle and core flux density over time
  • Identified a twisted morphology of the jet with position angles ranging from 170° to 195°
  • Observed a periodic oscillation of the jet position angle with an amplitude of 7.77° over approximately 10.94 years
  • Detected a continuous clockwise shift in the jet position angle at a rate of -0.83° per year
  • Found a strong correlation between core flux density and inner jet position angle changes

Cite This Study

Thevenet et al. (2026) studied this question.

synapsesocial.com/papers/69731022c8125b09b0d1fe23https://doi.org/10.1051/0004-6361/202557242/pdf
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