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XMM observations of high redshift X-ray clusters and cosmological interpretation

机译：高红移X射线星团的XMM观测和宇宙学解释

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摘要

We present the preliminary results of the Ω project, a large XMM program devoted to observe distant SHARC clusters. For the first time a measurement of the L-T evolution with XMM is presented. We found clear evidence for a positive evolution of the L-T relation, in agreement with most previous analysis based on ASCA and Chandra observations. Its cosmological implication is also discussed based on a new analysis of different X-ray surveys: EMSS, RDCS, MACS, SHARC, 160 deg~2. It is found that a high matter density model fits remarkably well all these surveys, in agreement with all existing previous analyzes following the same strategy. Concordance models produce far more faint clusters than observed counts. This failure could be the indication of a deviation from the expected scaling of the M—T relation with redshift. However, no signature of such possibility is found in existing data.
机译：我们介绍了Ω项目的初步结果，Ω项目是一个大型XMM程序，专用于观察遥远的SHARC群集。首次提出了使用XMM测量L-T演变的方法。与以前基于ASCA和Chandra观测的大多数分析一致，我们发现了L-T关系正向演变的明确证据。还基于对不同X射线勘测的新分析：EMSS，RDCS，MACS，SHARC，160度〜2，讨论了其宇宙学意义。发现高物质密度模型非常适合所有这些调查，与遵循相同策略的所有现有先前分析相符。一致性模型产生的簇比观察到的计数要弱得多。该失败可能表示与红移相关的MT关系的预期比例出现偏差。但是，在现有数据中找不到这种可能性的签名。

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