Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-07-27
Mon.Not.Roy.Astron.Soc.348:1105,2004
Astronomy and Astrophysics
Astrophysics
16 pages, 15 figures. Accepted for publication in MNRAS. Revised version taking referee's comments into account, minor changes
Scientific paper
10.1111/j.1365-2966.2004.07382.x
Active galactic nuclei are clearly heating gas in `cooling flows'. The effectiveness and spatial distribution of the heating are controversial. We use three-dimensional simulations on adaptive grids to study the impact on a cooling flow of weak, subrelativistic jets. The simulations show cavities and vortex rings as in the observations. The cavities are fast-expanding dynamical objects rather than buoyant bubbles as previously modelled, but shocks still remain extremely hard to detect with X-rays. At late times the cavities turn into overdensities that strongly excite the cluster's g-modes. These modes damp on a long timescale. Radial mixing is shown to be an important phenomenon, but the jets weaken the metallicity gradient only very near the centre. The central entropy density is modestly increased by the jets. We use a novel algorithm to impose the jets on the simulations.
Binney James
Bryan Greg
Omma Henrik
Slyz Adrianne
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