Two-fluid Dynamics in Clusters of Galaxies

作     者：Yu-Qing LouNational Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012Department of Physics & Tsinghua Center for Astrophysics (THCA), Tsinghua University, Beijing 100084 Department of Astronomy and Astrophysics, The University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637 USA 

作者机构：National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 

出 版 物：《Chinese Journal of Astronomy and Astrophysics》 (中国天文和天体物理学报（英文版）)

年 卷 期：2005年第5卷第1期

页      面：6-20页

核心收录：

学科分类：0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 070401[理学-天体物理] 0704[理学-天文学] 0825[工学-航空宇航科学与技术] 

基　　金：SupportedbytheNationalNaturalScienceFoundationofChina 

主　　题：dark matter - hydrodynamics - ISM: general - galaxies: clusters -outflows winds - shocks 

摘      要：We develop a theoretical formulation for the large-scale dynamics of galaxy clusters involving two spherical isothermal fluids coupled by their mutual gravity and derive asymptotic similarity solutions analytically. One of the fluids roughly approximates the massive dark matter halo, while the other describes the hot gas, the relatively small mass contribution from the galaxies being subsumed in the gas. By properly choosing the self-similar variables, it is possible to consistently transform the set of time-dependent two-fluid equations of spherical symmetry with self-gravity into a set of coupled nonlinear ordinary differential equations (ODEs). We focus on the analytical analysis and discuss applications of the solutions to galaxy clusters.