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arXiv 0806.1575astro-ph
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大质量星系团RXCJ2228 .6+2036的XMM-牛顿研究

XMM-Newton studies of a massive cluster of galaxies: RXCJ2228.6+2036

S. M. Jia, H. Boehringer, E. Pointecouteau, Y. Chen, Y. Y. Zhang

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10 pages, 14 figures
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摘要：

本文利用{ \it XMM-Newton}数据给出了一个大质量星系团（RXCJ 2228.6 +2036 at $z=0.421$）的X射线性质。的X射线质量建模是基于温度和密度分布的星系团内的介质使用的解投影方法。我们发现RXCJ 2228.6 +2036是一个热星系团（$T_{500}=8.92^{+1.78}_{-1.32}$ keV），在冷却流半径（$r_{cool}=147\pm10$ kpc）范围内进行光谱拟合，其冷却流速率为$12.0^{+56.0}_{-12.0}$ M $_{\odot}$ yr $^{-1}$.团簇总质量为$M_{500}=(1.19\pm0.35)\times10^{15}$ M $_{\odot}$，在$r_{500}=1.61\pm0.16$ Mpc时，平均气体质量分数为$f_{gas}=0.165\pm0.045$。我们讨论了PSF校正对光谱分析的影响，发现对于环宽，我们选择的PSF校正温度与没有PSF校正的温度是一致的。我们观察到一个显着的协议之间的X射线和SZ的结果，这是最重要的未来SZ调查。RXCJ 2228.6 +2036在解释了自相似演化后，遵循了在一般大质量星系团中发现的经验标度关系（例如$S$-$T$，$M$- $T$，$L$- $T$和$M$ - $Y$）。

英文摘要：

We present the X-ray properties of a massive cluster of galaxies (RXCJ2228.6+2036 at $z=0.421$) using {\it XMM-Newton} data. The X-ray mass modeling is based on the temperature and density distributions of the intracluster medium derived using a deprojection method. We found that RXCJ2228.6+2036 is a hot cluster ($T_{500}=8.92^{+1.78}_{-1.32}$ keV) showing a cooling flow rate of $12.0^{+56.0}_{-12.0}$ M$_{\odot}$yr$^{-1}$ based on spectral fitting within the cooling flow radius ($r_{cool}=147\pm10$ kpc). The total cluster mass is $M_{500}=(1.19\pm0.35)\times10^{15}$ M$_{\odot}$ and the mean gas mass fraction is $f_{gas}=0.165\pm0.045$ at $r_{500}=1.61\pm0.16$ Mpc. We discussed the PSF-correction effect on the spectral analysis and found that for the annular width we chose the PSF-corrected temperatures are consistent with those without PSF-correction. We observed a remarkable agreement between X-ray and SZ results, which is of prime importance for the future SZ survey. RXCJ2228.6+2036 obeys the empirical scaling relations found in general massive galaxy clusters (e.g. $S$--$T$, $M$--$T$, $L$--$T$ and $M$--$Y$) after accounting for self-similar evolution.

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