Jet kinematics in the transversely stratified jet of 3C 84 A two-decade overview
G. F. Paraschos, T. P. Krichbaum, J.-Y. Kim, J. A. Hodgson, J. Oh, E., Ros, J. A. Zensus, A. P. Marscher, S. G. Jorstad, M. A. Gurwell, A., L\"ahteenm\"aki, M. Tornikoski, S. Kiehlmann, A. C. S. Readhead

TL;DR
This study provides a two-decade overview of the kinematics and structure of the jet in 3C 84, revealing frequency-dependent stratification and linking jet ejections to multi-wavelength variability.
Contribution
It offers the first detailed analysis of the jet's transverse stratification and kinematics over twenty years using multi-frequency VLBI observations.
Findings
Jet features have apparent velocities of 0.055-0.22c.
Jet width decreases at higher frequencies, indicating stratification.
Spectral index maps show variable orientation of the spectral gradient.
Abstract
3C84 (NGC1275) is one of the brightest radio sources in the mm radio-bands, which led to a plethora of VLBI observations at numerous frequencies over the years. They reveal a two-sided jet structure, with an expanding but not well-collimated parsec-scale jet, pointing southward. High resolution mm-VLBI observations allow the study and imaging of the jet base on the sub-parsec scale. This could facilitate the investigation of the nature of the jet origin, also in view of the previously detected two-railed jet structure and east-west oriented core region seen with RadioAstron at 22 GHz. We produce VLBI images of this core and inner jet region, observed during the past twenty years at 15, 43, and 86 GHz. We determine the kinematics of the inner jet and ejected features at 43 and 86 GHz and compare their ejection times with radio and -ray variability. For the moving jet features, we…
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