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arXiv 1012.1322astro-ph.CO
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REFLEX II星系团巡天:功率谱分析

The REFLEX II galaxy cluster survey: power spectrum analysis

A. Balaguera-Antolinez, Ariel G. Sanchez, H. Böhringer, C. Collins, L. Guzzo, S. Phleps

摘要:

本文介绍了新的ROSAT-ESO通量限制X射线(REFLEX II)星系团星系团星表中测量的星系团功率谱。这个新的样本扩展了原来的REFLEX的流量限制$1.8 \times 10^{-12} erg/ s/cm^{2}$,产生了总共911个集群与$\geq 94$ %的完整性在红移后续。通过创建一组100个类似REFLEX II的模拟星系团星表,改进了对数据的分析,这些星表是从一套大容量LCDM N体模拟(L-BASICC II)中构建的。测得的功率谱与LCDM宇宙学模型的预言一致。测量结果表明,随着X射线亮度的增加,功率谱的幅度预期会增加。在大尺度上,我们表明,所测量的功率谱的形状是兼容的尺度独立的偏见,并提供了一个模型的振幅,使我们能够连接我们的测量与宇宙学模型。通过实施一个亮度相关的功率谱估计,我们观察到,从REFLEX II样品测得的功率谱是弱通量选择效应的影响。测量的功率谱的形状与尺度$k>0.01\,h/Mpc$上的无特征功率谱兼容,因此无法检测到统计上显着的重子声学振荡信号。我们表明,测量的反射II功率谱显示非线性演化的签名。

英文摘要:

We present the power spectrum of galaxy clusters measured from the new ROSAT-ESO Flux-Limited X-Ray (REFLEX II) galaxy cluster catalogue. This new sample extends the flux limit of the original REFLEX to $1.8 \times 10^{-12} erg/ s/cm^{2}$, yielding a total of 911 clusters with $\geq 94$ per cent completeness in redshift follow-up. The analysis of the data is improved by creating a set of 100 REFLEX II-like mock galaxy cluster catalogues built from a suite of large volume LCDM N-body simulations (L-BASICC II). The measured power spectrum is in agreement with the predictions from a LCDM cosmological model. The measurements show the expected increase in the amplitude of the power spectrum with increasing X-ray luminosity. On large scales, we show that the shape of the measured power spectrum is compatible with a scale independent bias and provide a model for the amplitude that allows us to connect our measurements with a cosmological model. By implementing a luminosity-dependent power spectrum estimator, we observe that the power spectrum measured from the REFLEX II sample is weakly affected by flux-selection effects. The shape of the measured power spectrum is compatible with a featureless power spectrum on scales $k>0.01\,h/Mpc$ and hence no statistically significant signal of baryonic acoustic oscillations can be detected. We show that the measured REFLEX II power spectrum displays signatures of non-linear evolution.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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