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Title:
Metal mixing by buoyant bubbles in galaxy clusters
Authors:
Roediger, E.; Brüggen, M.; Rebusco, P.; Böhringer, H.; Churazov, E.
Affiliation:
AA(International University Bremen, PO Box 750561, 28725 Bremen, Germany), AB(International University Bremen, PO Box 750561, 28725 Bremen, Germany), AC(Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, 85741 Garching, Germany), AD(MPI für Extraterrestrische Physik, P.O. Box 1603, 85740 Garching, Germany), AE(Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, 85741 Garching, Germany; Space Research Institute (IKI), Profsoyuznaya 84/32, Moscow 117810, Russia)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 375, Issue 1, pp. 15-28. (MNRAS Homepage)
Publication Date:
02/2007
Origin:
MNRAS
MNRAS Keywords:
hydrodynamics, galaxies: active, galaxies: clusters: general, cooling flows, galaxies: jets
DOI:
10.1111/j.1365-2966.2006.11300.x
Bibliographic Code:
2007MNRAS.375...15R

Abstract

Using a series of three-dimensional, hydrodynamic simulations on an adaptive grid, we have performed a systematic study on the effect of bubble-induced motions on metallicity profiles in clusters of galaxies. In particular, we have studied the dependence on the bubble size and position, the recurrence times of the bubbles, the way these bubbles are inflated and the underlying cluster profile. We find that in hydrostatic cluster models, the resulting metal distribution is very elongated along the direction of the bubbles. Anisotropies in the cluster or ambient motions are needed if the metal distribution is to be spherical. In order to parametrize the metal transport by bubbles, we compute effective diffusion coefficients. The diffusion coefficients inferred from our simple experiments lie at values of around ~1029 cm2 s-1 at a radius of 10 kpc. The runs modelled on the Perseus cluster yield diffusion coefficients that agree very well with those inferred from observations.
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