High--Resolution 3D Simulations of Relativistic Jets

Details High--Resolution 3D Simulations of Relativistic Jets High--Resolution 3D Simulations of Relativistic Jets

1999-06-26

arxiv.org/abs/astro-ph/9906428v1

Astronomy and Astrophysics

Astrophysics

15 pages, 4 figures. Accepted to be publish in the ApJ Letters. Tar+gzip document

Scientific paper

10.1086/312266

We have performed high-resolution 3D simulations of relativistic jets with beam flow Lorentz factors up to 7, a spatial resolution of 8 cells per beam radius, and for up to 75 normalized time units to study the morphology and dynamics of 3D relativistic jets. Our simulations show that the coherent fast backflows found in axisymmetric models are not present in 3D models. We further find that when the jet is exposed to non-axisymmetric perturbations, (i) it does not display the strong perturbations found for 3D classical hydrodynamic and MHD jets (at least during the period of time covered by our simulations), and (ii) it does propagate according to the 1D estimate. Small 3D effects in the relativistic beam give rise to a lumpy distribution of apparent speeds like that observed in M87. The beam is surrounded by a boundary layer of high specific internal energy. The properties of this layer are briefly discussed.

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