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| Paper: |
Hydrodynamic Simulations of Light Bipolar Large Scale Jets |
| Volume: |
290, Active Galactic Nuclei: from Central Engine to Host Galaxy |
| Page: |
341 |
| Authors: |
Krause, M.; Camenzind, M. |
| Abstract: |
Emission line observations of high redshift (z > 2) radio galaxies as well as recent Chandra X-ray observations at low redshift show interesting features around the symmetry plane of those objects. We have carried out simulations involving both jets, removing the artificial boundary condition at the symmetry plane. We use a low density contrast (IGM/jet approximately 10000) and take into account a decreasing density profile. We find that the jet bow shock undergoes two phases: First a nearly spherical one and second the well-known cigar-shaped one. We propose Cygnus A to be in a transition phase, showing currently clear signs from both phases. Due to inward growing of Kelvin Helmholtz instabilities between cocoon and shocked IGM, mass entrainment is observed predominantly in the symmetry plane. We propose this mechanism to produce emission line regions in high redshift radio galaxies, and maybe also the enigmatic X-ray features in the symmetry plane in Cygnus A. |
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