Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-01-15
New Astron.Rev. 47 (2003) 573-576
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures, New Astron. Rev., proceedings of the conference in Bologna: "The Physics of Relativistic Jets in the CHAND
Scientific paper
10.1016/S1387-6473(03)00096-4
Recent Chandra X-ray observations of jets in central cluster galaxies show interesting features around the symmetry plane. We have carried out simulations involving bipolar jets, removing the artificial boundary condition at the symmetry plane. We use a very low jet density (IGM/jet roughly 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, clear signs from both phases. Due to inward growing of Kelvin Helmholtz instabilities (KHI) between cocoon and shocked IGM, mass entrainment is observed predominantly in the symmetry plane. We propose this mechanism to produce some of the so far enigmatic X-ray features in the symmetry plane in Cygnus A.
Camenzind Max
Krause Martin
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