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Title:
Effect of turbulent diffusion on iron abundance profiles
Authors:
Rebusco, P.; Churazov, E.; Böhringer, H.; Forman, W.
Affiliation:
AA(Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, 85741 Garching, Germany), AB(Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, 85741 Garching, Germany; Space Research Institute (IKI), Profsoyuznaya 84/32, Moscow 117810, Russia), AC(MPI für Extraterrestrische Physik, PO Box 1603, 85740 Garching, Germany), AD(Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 372, Issue 4, pp. 1840-1850. (MNRAS Homepage)
Publication Date:
11/2006
Origin:
MNRAS
MNRAS Keywords:
diffusion, turbulence, galaxies: abundances
DOI:
10.1111/j.1365-2966.2006.10977.x
Bibliographic Code:
2006MNRAS.372.1840R

Abstract

We compare the observed peaked iron abundance profiles for a small sample of groups and clusters with the predictions of a simple model involving the metal ejection from the brightest galaxy and the subsequent diffusion of metals by stochastic gas motions. Extending the analysis of Rebusco et al., we found that for five out of eight objects in the sample an effective diffusion coefficient of the order of 1029 cm2 s-1 is needed. For AWM4, Centaurus and AWM7 the results are different suggesting substantial intermittence in the process of metal spreading across the cluster. There is no obvious dependence of the diffusion coefficient on the mass of the system.

We also estimated the characteristic velocities and the spatial scales of the gas motions needed to balance the cooling losses by the dissipation of the same gas motions. A comparison of the derived spatial scales and the sizes of observed radio bubbles inflated in the ICM by a central active galactic nucleus (AGN) suggests that the AGN/ICM interaction makes an important (if not a dominant) contribution to the gas motions in the cluster cores.

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