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arXiv 1208.0597astro-ph.CO
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巨人的重量- I。51个大质量星系团的弱透镜质量:项目概述,数据分析方法和星系团图像

Weighing the Giants - I. Weak-lensing masses for 51 massive galaxy clusters: project overview, data analysis methods and cluster images

Anja von der Linden, Mark T. Allen, Douglas E. Applegate, Patrick L. Kelly, Steven W. Allen, Harald Ebeling, Patricia R. Burchat, David L. Burke, David Donovan,… 展开作者

Anja von der Linden, Mark T. Allen, Douglas E. Applegate, Patrick L. Kelly, Steven W. Allen, Harald Ebeling, Patricia R. Burchat, David L. Burke, David Donovan, R. Glenn Morris, Roger Blandford, Thomas Erben, Adam Mantz

摘要:

这是一系列论文中的第一篇,在这些论文中,我们测量了51个已知红移为0.15<z<0.7的X射线最明亮的星系团的精确弱透镜质量,以便校准宇宙学星系团实验的X射线和其他质量代理。主要目的是提高绝对质量校准的集群可观的,目前占主导地位的系统不确定性集群计数实验。这项工作的关键要素是系统不确定性的严格量化、高质量的数据简化和光度校准,以及分析的“盲目”性质,以避免确认偏差。我们的目标集群是从RASS X射线星表,并提供了一个多功能的校准样品的许多方面的集群宇宙学。我们使用斯巴鲁和CFHT望远镜获得了所有51个星团的宽视场高质量成像,每个星团至少有三个波段。对于27个星系团的子集,我们至少有五个波段的数据,可以准确地估计透镜星系的照片。在本文中,我们描述了集群样本和观测,并详细介绍了SuprimeCam数据的处理,以产生高质量的图像,适用于强大的弱透镜形状测量和精密测光。对于每个集群,我们提出了宽视场彩色光学图像和弱透镜质量分布,光学光分布和X射线发射的地图,提供洞察到集群嵌入的大尺度结构。我们测量了星系团中X射线质心和Brilliant Cluster Galliant之间的偏移量,发现这些偏移量一般都很小,中位数为20 kpc。对于<100 kpc的偏移量,以BCG为中心的弱透镜质量测量值与相对于X射线质心确定的值吻合得很好;因此,偏心不是我们质量测量的系统不确定性的重要来源。[删节]

英文摘要:

This is the first in a series of papers in which we measure accurate weak-lensing masses for 51 of the most X-ray luminous galaxy clusters known at redshifts 0.15<z<0.7, in order to calibrate X-ray and other mass proxies for cosmological cluster experiments. The primary aim is to improve the absolute mass calibration of cluster observables, currently the dominant systematic uncertainty for cluster count experiments. Key elements of this work are the rigorous quantification of systematic uncertainties, high-quality data reduction and photometric calibration, and the "blind" nature of the analysis to avoid confirmation bias. Our target clusters are drawn from RASS X-ray catalogs, and provide a versatile calibration sample for many aspects of cluster cosmology. We have acquired wide-field, high-quality imaging using the Subaru and CFHT telescopes for all 51 clusters, in at least three bands per cluster. For a subset of 27 clusters, we have data in at least five bands, allowing accurate photo-z estimates of lensed galaxies. In this paper, we describe the cluster sample and observations, and detail the processing of the SuprimeCam data to yield high-quality images suitable for robust weak-lensing shape measurements and precision photometry. For each cluster, we present wide-field color optical images and maps of the weak-lensing mass distribution, the optical light distribution, and the X-ray emission, providing insights into the large-scale structure in which the clusters are embedded. We measure the offsets between X-ray centroids and Brightest Cluster Galaxies in the clusters, finding these to be small in general, with a median of 20kpc. For offsets <100kpc, weak-lensing mass measurements centered on the BCGs agree well with values determined relative to the X-ray centroids; miscentering is therefore not a significant source of systematic uncertainty for our mass measurements. [abridged]

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