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2006MNRAS.371..548R - Mon. Not. R. Astron. Soc., 371, 548-568 (2006/September-2)
Simulating galaxy clusters - I. Thermal and chemical properties of the intracluster medium.
ROMEO A.D., SOMMER-LARSEN J., PORTINARI L. and ANTONUCCIO-DELOGU V.
Abstract (from CDS):
In this paper, the first in a series of three, we derive results, mainly at z = 0, on the temperature and entropy profiles of the ICM, its X-ray luminosity, the cluster cold components [cold fraction as well as mass-to-light ratio (MLR)] and the metal distribution between ICM and stars.
In general, models with efficient superwinds (produced by the action of supernovae and, in some simulations, of active galactic nuclei (AGNs), along with a top-heavy stellar IMF, are able to reproduce fairly well the observed LX-T relation, the entropy profiles and the cold fraction: both features are found to be needed in order to remove high-density and low-entropy cold gas at core scales, although additional alternative feedback mechanisms would still be required to prevent late-time central cooling flows, and subsequent overproduction of stars and heavy elements at the centre. Observed radial ICM temperature profiles can be matched, except for the gradual decline in temperature inside r ∼ 0.1Rvir. Metal enrichment of the ICM gives rise to somewhat steep inner iron gradients; yet, the global level of enrichment compares well to observational estimates when a top-heavy IMF is adopted, and after correcting for the stars formed at late times at the base of the cooling flows, the metal partition between stars and ICM gets into good agreement with observations. The overall abundance and profile of iron in the ICM is found essentially unchanged from z = 1 to present time. Finally, the α/Fe of the gas is found to increase steadily with radius, decreasing over time.
Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS
Journal keyword(s): methods: {em N}-body simulations - galaxies: clusters: general - galaxies: evolution - galaxies: formation - cosmology: theory
Errata: erratum vol. 373, p. 1648 (2006)
Simbad objects: 11
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