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The source of Faraday rotation in the jet of the radio galaxy 3C120 isanalyzed through Very Long Baseline Array observations carried out between 1999and 2007 at 86, 43, 22, 15, 12, 8, 5, 2, and 1.7 GHz. Comparison ofobservations from 1999 to 2001 reveals uncorrelated changes in the linearpolarization of the underlying jet emission and the Faraday rotation screen:while the rotation measure (RM) remains constant between approximately 2 and 5mas from the core, the RM-corrected electric vector position angles (EVPAs) oftwo superluminal components are rotated by almost 90 degrees when compared toother components moving through similar jet locations. On the other hand, theinnermost 2 mas experiences a significant change in RM -- including a signreversal -- but without variations in the RM-corrected EVPAs. Similarly,observations in 2007 reveal a double sign reversal in RM along the jet, whilethe RM-corrected EVPAs remain perpendicular to the jet axis. Although theobserved coherent structure and gradient of the RM along the jet supports theidea that the Faraday rotation is produced by a sheath of thermal electronsthat surrounds the emitting jet, the uncorrelated changes in the RM andRM-corrected EVPAs indicate that the emitting jet and the source of Faradayrotation are not closely connected physically and have different configurationsfor the magnetic field and/or kinematical properties. Furthermore, theexistence of a region of enhanced RM whose properties remain constant overthree years requires a localized source of Faraday rotation, favoring a modelin which a significant fraction of the RM originates in foreground clouds.

On the source of Faraday rotation in the jet of the radio galaxy 3C120