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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/24329
Title: On the Nature of Hydrostatic Equilibrium in Galaxy Clusters
Authors: Biffi, V.
BORGANI, STEFANO 
MURANTE, Giuseppe 
RASIA, ELENA 
Planelles, S.
GRANATO, Gian Luigi 
Ragone-Figueroa, C.
Beck, A. M.
GASPARI, MASSIMO 
Dolag, K.
Issue Date: 2016
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 827
Issue: 2
First Page: 112
Abstract: In this paper, we investigate the level of hydrostatic equilibrium (HE) in the intracluster medium of simulated galaxy clusters, extracted from state-of-the-art cosmological hydrodynamical simulations performed with the Smoothed-Particle-Hydrodynamic code GADGET-3. These simulations include several physical processes, among which are stellar and active galactic nucleus feedback, and have been performed with an improved version of the code that allows for a better description of hydrodynamical instabilities and gas mixing processes. Evaluating the radial balance between the gravitational and hydrodynamical forces via the gas accelerations generated, we effectively examine the level of HE in every object of the sample and its dependence on the radial distance from the center and on the classification of the cluster in terms of either cool-coreness or dynamical state. We find an average deviation of 10%-20% out to the virial radius, with no evident distinction between cool-core and non-cool-core clusters. Instead, we observe a clear separation between regular and disturbed systems, with a more significant deviation from HE for the disturbed objects. The investigation of the bias between the hydrostatic estimate and the total gravitating mass indicates that, on average, this traces the deviation from HE very well, even though individual cases show a more complex picture. Typically, in the radial ranges where mass bias and deviation from HE are substantially different, the gas is characterized by a significant amount of random motions (≳ 30 % ), relative to thermal ones. As a general result, the HE-deviation and mass bias, at a given distance from the cluster center, are not very sensitive to the temperature inhomogeneities in the gas. <P />
URI: http://hdl.handle.net/20.500.12386/24329
URL: https://iopscience.iop.org/article/10.3847/0004-637X/827/2/112
ISSN: 0004-637X
DOI: 10.3847/0004-637X/827/2/112
Bibcode ADS: 2016ApJ...827..112B
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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