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Current observations have shown that astrophysical jets reveal strong signsof radial structure. They suggest that the inner region of the jet, the jetspine, consists of a low-density, fast-moving gas, while the outer region ofthe jet consists of a more dense and slower moving gas, called the jet sheath.Moreover, if jets carry angular momentum, the resultant centrifugal forces leadto a radial stratification. Current observations are not able to fully resolvethe radial structure, so little is known about its actual profile. We presentthree AGN jet models in $2.5D$ of which two have been given a radial structure.The first model is a homogeneous jet, the only model that doesn't carry angularmomentum; the second model is a spine-sheath jet with an isothermal equation ofstate; and the third jet model is a (piecewise) isochoric spine-sheath jet,with constant but different densities for jet spine and jet sheath. In thispaper, we look at the effects of radial stratification on jet integrity, mixingbetween the different jet components and global morphology of the jet-head andsurrounding cocoon.

Relativistic AGN jets I. The delicate interplay between jet structure, cocoon morphology and jet-head propagation