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arXiv 0705.0358astro-ph
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星系团弱透镜质量和X射线性质的比较

Comparison of weak lensing masses and X-ray properties of galaxy clusters

Henk Hoekstra

摘要:

我们目前的测量质量的20个X射线发光星系团在中间的红移,确定从一个弱透镜分析深档案R波段数据使用加拿大-法国-夏威夷望远镜。与以前的工作相比,我们的分析考虑了一些通常被忽略的影响,但可能导致小偏差或错误的误差估计。我们得到的质量基本上是模型独立的,并发现他们同意与测量的星系团的速度色散和X射线研究的结果。假设透镜质量与X射线温度M_2500 T^α之间存在幂律关系,我们发现最佳拟合斜率α =1.34^{+0.30}_{-0.28}。该斜率与自相似簇模型和仅基于X射线数据的研究一致。对于一个温度为kT= 5 keV的星系团,我们得到的质量为M_{2500} =(1.4+-0.2)\times 10^{14}h^{-1}Msun,这与最近钱德拉和XMM的研究结果完全一致。

英文摘要:

We present measurements of the masses of 20 X-ray luminous clusters of galaxies at intermediate redshifts, determined from a weak lensing analysis of deep archival R-band data obtained using the Canada-France-Hawaii-Telescope. Compared to previous work, our analysis accounts for a number of effects that are typically ignored, but can lead to small biases, or incorrect error estimates. We derive masses that are essentially model independent and find that they agree well with measurements of the velocity dispersion of cluster galaxies and with the results of X-ray studies. Assuming a power law between the lensing mass and the X-ray temperature, M_2500 T^alpha, we find a best fit slope of alpha=1.34^{+0.30}_{-0.28}. This slope agrees with self-similar cluster models and studies based on X-ray data alone. For a cluster with a temperature of kT=5keV we obtain a mass M_{2500}=(1.4+-0.2)\times 10^{14}h^{-1}Msun in fair agreement with recent Chandra and XMM studies.

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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