Parameters for very light jets of cD galaxies

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 ≈10 4) and take...

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Vydáno v:New astronomy reviews Ročník 47; číslo 6; s. 573 - 576
Hlavní autoři: Krause, M, Camenzind, M
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier B.V 01.10.2003
Témata:
Hydrodynamics
Jet propagation
Simulation
98.62.Nx
98.65.Cw
Jet propagation
47.27.W
Hydrodynamics
98.70.Dk
98.54
Simulation
95.30.L
98.58.F
95.30.Lz
98.62.Ra
98.38.F
ISSN:1387-6473, 1872-9630
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Shrnutí: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 ≈10 4) 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 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.
ISSN:1387-6473
1872-9630
DOI:10.1016/S1387-6473(03)00096-4