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arXiv 0705.0531astro-ph
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Beta模型问题:X射线的不相容性和适用于星系团的Sunyaev-Zeldovich效应模型

The Beta-Model Problem: The Incompatibility of X-ray and Sunyaev-Zeldovich Effect Model Fitting for Galaxy Clusters

Eric J. Hallman, Jack O. Burns, Patrick M. Motl, Michael L. Norman

摘要:

我们已经分析了一个大样本的数值模拟集群,以证明使用X射线拟合β模型参数与Sunyaev-Zeldovich效应(SZE)数据的不利影响。X射线表面亮度曲线的模型拟合与SZE曲线拟合之间存在根本的不兼容性。由于观测的SZE径向廓线比较缺乏,因此在SZE分析中经常使用X射线参数。我们发现,这导致有偏估计的综合康普顿y-参数内r_{500}计算集群。我们建议一个简单的校正的方法,使用非等温β-模型修改的通用温度分布,使这些计算量更接近真实值。

英文摘要:

We have analyzed a large sample of numerically simulated clusters to demonstrate the adverse effects resulting from use of X-ray fitted beta-model parameters with Sunyaev-Zeldovich effect (SZE) data. There is a fundamental incompatibility between model fits to X-ray surface brightness profiles and those done with SZE profiles. Since observational SZE radial profiles are in short supply, the X-ray parameters are often used in SZE analysis. We show that this leads to biased estimates of the integrated Compton y-parameter inside r_{500} calculated from clusters. We suggest a simple correction of the method, using a non-isothermal beta-model modified by a universal temperature profile, which brings these calculated quantities into closer agreement with the true values.

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