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We present a stationary, axisymmetric, self-similar semi-analytic model ofmagnetically dominated jet plasma based on force-free regions of a relativisticmagnetohydrodynamic simulation. We use this model to illustrate how thecomposition of relativistic jet plasma can be determined, with specialattention to the example of M87. In particular, we compute synthetic Stokesmaps in e-e+p plasmas with various positron-to-proton ratios using synchrotronemission models scaling the partial pressure of electrons and positronsemitting at the observed frequency to the magnetic pressure, taking intoaccount Faraday rotation and conversion. The lepton-dominated models producebilaterally asymmetric radio intensity profiles with strong linear polarizationand Stokes Q and U maps that are bilaterally asymmetric (but strongly up-downcorrelated) and antisymmetric (and sometimes up-down anticorrelated),respectively. The hadronic models produce more centrally brightened intensityand polarization maps. Circular polarization provides the cleanestobservational tool for distinguishing the plasmas, as it increases outward fromthe jet core and central axis for highly ionic plasma, and is suppressed forpair dominated plasma. We find a measurable degree of circular polarization V/Iof O(10e-3) for sub-equipartition hadronic jet plasmas. Our stationary modelpredicts that the intensity-normalized autocorrelation functions of Q and Uincrease and decrease with frequency, respectively. On the other hand, theautocorrelation of V is less sensitive to the frequency. Multi-bandpolarimetric observations could therefore be used as a novel probe of thecomposition of jet plasma.

Determining the Composition of Relativistic Jets from Polarization Maps