Are Large X-ray Clusters at Thermal Equilibrium ?

Abstract

We simulate the formation of a large X-ray cluster using a fully 3D hydrodynamical code coupled to a Particle-Mesh scheme which models the dark matter component. We focus on a possible decoupling between electrons and ions temperatures. We then solve the energy transfer equations between electrons, ions and neutrals without assuming thermal equilibrium between the three gases (T_e <> T_i <> T_n). We solve self-consistently the chemical equations for an hydrogen/helium primordial plasma without assuming ionization-recombination equilibrium. We find that the electron temperature differs from the true dynamical temperature by 20% at the Virial radius of our simulated cluster. This could lead marginally to an underestimate of the total mass in the outer regions of large X-ray clusters.

15 pages, LaTex2e, accepted for publication in ApJ also available at http://www-dapnia.cea.fr/Publications/Sap/sap97.html

References in corpus (2)

• Self Similar Spherical Collapse Revisited: a Comparison between Gas and Dark Matter Dynamics
• Gas and Dark Matter Spherical Dynamics

Cited by in corpus (20)

• Cosmological Hydrodynamics with Adaptive Mesh Refinement: a new high resolution code called RAMSES
• The mass profile of A1413 observed with XMM-Newton: implications for the M-T relation
• Four Measures of the Intracluster Medium Temperature and Their Relation to a Cluster's Dynamical State
• Outskirts of Galaxy Clusters
• Two-Temperature Intracluster Medium in Merging Clusters of Galaxies
• On the Detectability of Turbulence and Bulk Flows in X-ray Clusters
• Mass Profiles of the Typical Relaxed Galaxy Clusters A2199 and A496
• Non-Equilibrium Electrons and the Sunyaev-Zel'dovich Effect of Galaxy Clusters
• Off-Center Mergers of Clusters of Galaxies and Nonequipartition of Electrons and Ions in Intracluster Medium
• An implicit scheme for solving the anisotropic diffusion of heat and cosmic rays in the RAMSES code
• A Two-Temperature Model of the Intracluster Medium
• Effects of the Non-Equipartition of Electrons and Ions in the Outskirts of Relaxed Galaxy Clusters
• WMAP constraints on the Intra-Cluster Medium
• Transverse and longitudinal correlation functions in the Intergalactic Medium from 32 close pairs of high-redshift quasars
• The Temperature Structure of the Warm-Hot Intergalactic Medium
• Thermodynamic evolution of cosmological baryonic gas: I. Influence of non-equipartition processes
• Cluster physics from joint weak gravitational lensing and Sunyaev-Zel'dovich data
• The Effect of Formation Redshifts on the Cluster Mass-Temperature Relation
• Non equilibrium thermodynamics and cosmological pancakes formation
• Simulations of Merging Clusters of Galaxies