Adiabatic expansion and magnetic fields in AGN jets
  Results of high-resolution simultaneous multi-frequency 8.1-15.4 GHz VLBA polarimetric observations of relativistic jets in active galactic nuclei (the MOJAVE-2 project) are analyzed. We compare characteristics of VLBI features with jet model predictions and test if adiabatic expansion is a dominating mechanism for the evolution of relativistic shocks in parsec-scale AGN jets. We also discuss magnetic field configuration, both predicted by the model and deduced from electric vector position angle measurements. 
A. B. Pushkarev (MPIfR, Pulkovo, CrAO), Y. Y. Kovalev (MPIfR, ASC   Lebedev), A. P. Lobanov (MPIfR)