Abstract
The transversely homologous steady state models of radio jets are treated as three-component mixtures (protons, electrons, and relativistic electrons). The jets may be both relativistically hot and macroscopically relativistic. We find a new fit for the main jet in NGC 315 with a model dominated by relativistic-electron pressure and demonstrate an alternative method for deducing the external equilibrium pressure required to collimate a jet. This new method does not require an a priori parametrized pressure law to be assumed. We also discuss the maximum ''curvature'' which a homologous, pressure-confined jet may have, and so deduce distinguishing behavior of macroscopically relativistic jets and of cold jets.
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