A parametric physical model for the intracluster medium and its use in joint SZ/X-ray analyses of galaxy clusters A parametric physical model for the ICM
A parametric physical model for the intracluster medium and its use in joint SZ/X-ray analyses of galaxy clusters A parametric physical model for the ICM
复制标题
簇内介质的参数化物理模型及其在星系团联合 SZ/X 射线分析中的应用 ICM 的参数化物理模型
DOI：
10.1111/j.1365-2966.2010.17447.x
复制
发表时间：
2011
影响因子：
4.8
通讯作者：
Allison J
中科院分区：
文献类型：
--
作者：
Allison J
We present a parametrized model of the intracluster medium that is suitable for jointly analysing pointed observations of the Sunyaev–Zel'dovich (SZ) effect and X-ray emission in galaxy clusters. The model is based on assumptions of hydrostatic equilibrium, the Navarro, Frenk and White model for the dark matter and a softened power-law profile for the gas entropy. We test this entropy-based model against high and low signal-to-noise ratio ratio mock observations of a relaxed and recently merged cluster fromN-body/hydrodynamic simulations, using Bayesian hyperparameters to optimize the relative statistical weighting of the mock SZ and X-ray data. We find that it accurately reproduces both the global values of the cluster temperature, total mass and gas mass fraction (fgas), and the radial dependencies of these quantities outside the core (r> 100 kpc). For reference, we also provide a comparison with results from the single isothermal β model. We confirm previous results that the single isothermal β model can result in significant biases in derived cluster properties.
