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The Emission and Dynamics of a Heavy Three-dimensional Magnetized Jet

A three-dimensional magnetohydrodynamical simulation of a heavy supermagnetosonic magnetized jet has been performed. The jet is precessed at the origin to excite Kelvin-Helmholtz unstable helical modes. The jet exhibits an apparent large amplitude helical twist induced by the precession. Twin magnetic filaments accompany an elliptical distortion. The magnetic filaments twist through 360° over a length scale about twice that required for jet helicity induced by precession to twist through 360°. This organized structure is maintained over considerable distance and is associated with a denser jet core that is surrounded by a less dense sheath consisting of slower moving jet fluid and a magnetic field mixed with the external medium.