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Title:
Heating cooling flows with jets
Authors:
Omma, Henrik; Binney, James; Bryan, Greg; Slyz, Adrianne
Affiliation:
AA(Department of Physics, Keble Road, Oxford OX1 3NP), AB(Department of Physics, Keble Road, Oxford OX1 3NP), AC(Department of Physics, Keble Road, Oxford OX1 3NP), AD(Department of Physics, Keble Road, Oxford OX1 3NP)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 348, Issue 4, pp. 1105-1119. (MNRAS Homepage)
Publication Date:
03/2004
Origin:
MNRAS
Astronomy Keywords:
hydrodynamics, cooling flows, galaxies: jets, X-rays: galaxies: clusters
DOI:
10.1111/j.1365-2966.2004.07382.x
Bibliographic Code:
2004MNRAS.348.1105O

Abstract

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 g modes of a cluster. These modes damp on a long time-scale. 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.

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