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The source NRAO150 is a very prominent millimeter to radio emitting quasar atredshift z=1.52 for which previous millimeter VLBI observations revealed a fastcounterclockwise rotation of the innermost regions of the jet. Here we presentnew polarimetric multi-epoch VLBI-imaging observations of NRAO150 performed at8, 15, 22, 43, and 86GHz with the VLBA and GMVA between 2006 and 2010. All newand previous observational evidence are consistent with an interpretation ofthe source behavior where the jet is seen at an extremely small angle to theline of sight, and the high frequency emitting regions in NRAO150 rotate athigh speeds on the plane of the sky with respect to a reference point that doesnot need to be related to any particularly prominent jet feature. The observedpolarization angle distribution at 22, 43, and 86 GHz during observing epochswith high polarization degree suggests that we have detected the toroidalcomponent of the magnetic field threading the innermost jet plasma regions.This is also consistent with the lower degree of polarization detected atprogressively poorer angular resolutions, where the integrated polarizationintensity produced by the toroidal field is explained by polarizationcancellation inside the observing beam. All this evidence is fully consistentwith a kinematic scenario where the main kinematic and polarization propertiesof the 43 GHz emitting structure of NRAO150 are explained by the internalrotation of such emission regions around the jet axis when the jet is seenalmost face on. A simplified model developed to fit helical trajectories to theobserved kinematics of the 43 GHz features fully supports this hypothesis. Thisexplains the kinematics of the innermost regions of the jet in NRAO150 in termsof internal jet rotation.

Evidence of internal rotation and a helical magnetic field in the jet of the quasar NRAO150