Effects of Radiation Drag on Relativistic MHD Flows

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Scientific paper

We generalize our previous study of radiation drag effects on relativistic MHD flows along radial flux tubes (Li, Begelman, Chiueh 1992) to those along flux tubes of arbitrary shape and opening. New effects occur because of the location of the fast magnetosonic point at a finite distance from the rotation axis. Depending on the strength of the drag coefficient and the position of the fast point relative to the region in which most of the isotropic ambient radiation is generated, an otherwise highly relativistic wind (in the absence of drag) can be severely retarded by the drag, so that its terminal flow 4-speed can be substantially reduced and in some cases the wind can even be quenched. We discuss our results in the context of a unified theory for AGNs.

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