The influence of mergers on the cluster temperature function and cosmological parameters derived from it

The influence of mergers on the cluster temperature function and cosmological parameters derived from it
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合并对星团温度函数和由此导出的宇宙学参数的影响

DOI:
10.1051/0004-6361/201116632
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发表时间:
2012
影响因子:
6.5
通讯作者:
Bartelmann
Bartelmann
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Angrick;Bartelmann

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我们发展了一个无参数的分析模型,将合并的影响纳入星系团X射线温度函数的理论模型中。我们基于引力势的涨落,将这种描述包括在我们的星团布居模型中,这避免了任何关于质量的参考。与数值模拟结果的对比表明,理论模型与数值模拟结果吻合较好。我们表明,如果使用发射加权温度,则建立球形坍塌动力学的模型比基于椭球塌陷的动力学模型更好,而椭球塌陷的模型与质量加权温度的模拟结果很好地吻合。通过对两个不同的X射线星系团样品的分析,我们量化了合并和不同温度定义之间的转换对Ωm0和σ8联合测定的影响。如果考虑合并的影响,基于星系团质量和建立在球形坍缩上的引力势的温度函数与其他宇宙学探测器在没有任何温度转换的情况下是一致的。
We develop a parameter-free analytic model to include the effects of mergers into the theoretical modelling of the X-ray temperature function of galaxy clusters. We include this description into our model for the cluster population based on fluctuations of the gravitational potential, which avoids any reference to mass. Comparisons with a numerical simulation reveal that the theoretical model is in good agreement with the simulation results. We show that building the model on the dynamics of spherical rather than ellipsoidal collapse yields better results if emission-weighted temperatures are used, while ellipsoidal collapse yields good agreement between model and simulation for mass-weighted temperatures. Analysing two different samples of X-ray clusters, we quantify the influence of mergers and a conversion between different temperature definitions on the joint determination of Ωm0andσ8. If effects of mergers are included, temperature functions based on cluster masses and on the gravitational potential built on spherical collapse are in good agreement with other cosmological probes without any conversion of temperatures.
DOI: 10.1086/342239
发表时间: 2002-06
期刊: The Astrophysical Journal
影响因子: --
作者:
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星系团中 X 射线和发射加权温度之间的不匹配:宇宙学意义
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发表时间: 2004
期刊: The Astrophysical Journal Letters
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作者:
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发表时间: 2004-04
影响因子: 4.8
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通讯作者: P. Mazzotta;E. Rasia;L. Moscardini;G. Tormen;Department of Physics University of RomeTor Vergata-Department-of-Physics-University-of-RomeTor-Vergata-1389703112;Italy Harvard-Smithsonian Center for Astrophysics;U. D. D. Astronomia-U.-D.-D.-Astronomia-1411788185;U. Padova;I. D. D. Astronomia-I.-D.-D.-Astronomia-102389674;U. Bologna;It
根据 WMAP 第三年数据得出的星系团 X 射线光度-引力质量关系
DOI: --
发表时间: 2006
期刊:
影响因子: --
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DOI: --
发表时间: 2008
期刊:
影响因子: --
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