Multi-wavelength studies of the luminous and dark mass profiles of galaxy-clusters in wide-field imaging surveys

宽视场成像巡天中星系团的发光和暗质量轮廓的多波长研究

• 批准号: 5449189
• 负责人: Dr. Thomas Erben
• 金额: --
• 依托单位: Argelander-Institut für Astronomie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5449189?language=en
• 关键词: Multi; wavelength; studies; luminous; dark

After the recent determination of the fundamental cosmological constants, a profound understanding of the dark and luminous matter distribution in the Universe is one of the key problems in modern cosmology. Hereby, clusters of galaxies provide well-defined laboratory environments to study the mass distribution and galaxy evolution over wide ranges of matter and galaxy densities. Today’s wide-field imaging cameras offer a unique opportunity to obtain large and statistically very well understood samples of clusters, with a selection based solely on their mass properties, using their weak gravitational lensing imprint on the shape of faint (background) galaxies. With the current proposal we ask for an extension of funding for a project aiming at exploiting these unique future data sets. Galaxy clusters will be selected on already available multi-colour data sets, a joint shear- and X-ray selection will be performed on deep multi-colour images pointing towards long XMM exposures, and a comparison of the efficiency of various cluster selection techniques will be performed. The galaxy population in the differently selected clusters will be compared; in particular, we will investigate whether shear-selected clusters have a particularly high mass-to-light ratio which would reveal a bias in ‘classical’ cluster selection methods. In addition, we will work on several technical aspects related to the data reduction and analysis of WFI data, in particular new methods for the inhomogeneous illumination and PSF corrections; these technical issues are an essential step for the full exploitation of future survey data, well beyond weak lensing applications.

随着宇宙学基本常数的确定，对宇宙中暗物质和亮物质分布的深入理解是现代宇宙学的关键问题之一。因此，星系团提供了明确的实验室环境，以研究在广泛的物质和星系密度范围内的质量分布和星系演化。今天的宽视场成像相机提供了一个独特的机会来获得大的和统计上非常好理解的星系团样本，仅根据它们的质量特性进行选择，利用它们对微弱（背景）星系形状的弱引力透镜印记。在目前的提案中，我们要求延长一个旨在利用这些独特的未来数据集的项目的资金。将在现有的多色数据集上选择星系团，将在指向长XMM曝光的深多色图像上进行联合剪切和X射线选择，并将对各种星系团选择技术的效率进行比较。在不同的选择集群的星系人口将进行比较，特别是，我们将调查剪切选择集群是否有一个特别高的质光比，这将揭示在“经典”集群选择方法的偏见。此外，我们将致力于与WFI数据的数据简化和分析相关的几个技术方面，特别是用于非均匀照明和PSF校正的新方法;这些技术问题是充分利用未来调查数据的重要步骤，远远超出弱透镜应用。

项目成果

Searching for galaxy clusters using the aperture mass statistics in 50 VLT fields

使用 50 个 VLT 场中的孔径质量统计数据搜索星系团

• DOI: 10.1051/0004-6361:20053339
• 发表时间: 2005
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: Hetterscheidt

GaBoDS: the Garching-Bonn Deep Survey. IX. A sample of 158 shear-selected mass concentration candidates

• DOI: 10.1051/0004-6361:20065955
• 发表时间: 2006-07
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: M. Schirmer;T. Erben;M. Hetterscheidt;Peter Schneider Isaac Newton Group of Telescopes;L. Palma;Spain.;Argelander Institut fuer Astronomie;U. Bonn;H Germany

Cosmological constraints from the 100-deg2 weak-lensing survey

• DOI: 10.1111/j.1365-2966.2007.12202.x
• 发表时间: 2007-03
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: J. Benjamin;C. Heymans;E. Semboloni;L. Waerbeke;H. Hoekstra;T. Erben;M. Gladders;M. Hetterscheidt-M.-Hettersc

GaBoDS: the Garching-Bonn Deep Survey. III. Lyman-break galaxies in the Chandra Deep Field South

GaBoDS：钱德拉深场南部的加兴-波恩深巡 III 莱曼断裂星系

• DOI: 10.1051/0004-6361:20042544
• 发表时间: 2005
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: Hildebrandt

GaBoDS: The Garching-Bonn Deep Survey VIII. Lyman-break galaxies in the ESO Deep Public Survey

GaBoDS：ESO 深度公共巡天中的加兴-波恩深巡 VIII 莱曼断裂星系

• DOI: 10.1051/0004-6361:20065880
• 发表时间: 2007
• 期刊: arXiv: Astrophysics
• 作者: Hildebrandt