Detailed analysis of a large, dedicated sample of HST clusters

HST 簇的大型专用样本的详细分析

• 批准号: 182811170
• 负责人: Professor Dr. Matthias Bartelmann
• 金额: --
• 依托单位: Institut für Theoretische Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/182811170?language=en
• 关键词: Detailed; analysis; large; dedicated; sample

While virtually all cosmological observations support the standard, ΛCDM cosmological model, galaxy clusters pose yet unanswered puzzles. Among them and related with each other are the arc-statistics problem, the overconcentration problem and the problem of large Einstein radii. All of them refer to the unexpectedly strong gravitational-lensing effects produced by massive galaxy clusters. It appears as if such clusters were much more efficient lenses than theory can explain. One major difficulty with the assessment of how relevant these problems are is the significance of the claims. Strong gravitational lensing being a rare phenomenon, they rest on small samples of well-studied cases. Testing the substance of these problems is the paramount goal of a 525 orbit proposal to the Space Telecope Science Institute that has recently been approved. In its course, 25 well-selected galaxy clusters will be observed in 14 wave bands. It will be one of the largest observing campaigns ever conducted with the Hubble Space Telescope. We are involved in this programme and propose to address all of its gravitational-lensing aspects. We wish to construct accurate mass maps including error bars based on joint analyses of strong and weak lensing, to derive concentration parameters and effective Einstein radii, to compare those to theoretical predictions and analyse the significance of possible deviations from them, and to test geometrically the relation between angular-diameter distance and redshift in order to constrain the expansion rate of the Universe. The upcoming cluster sample will be the ideal observational basis for the research proposed.

虽然几乎所有的宇宙学观测都支持标准的ΛCDM宇宙学模型，但星系团仍然存在未解之谜。其中，弧统计问题、过度集中问题和大爱因斯坦半径问题是相互关联的。它们都是指由大质量星系团产生的意想不到的强大引力透镜效应。这样的星团似乎是比理论所能解释的更有效的透镜。评估这些问题的相关性的一个主要困难是索赔的重要性。强引力透镜是一种罕见的现象，它们建立在经过充分研究的小样本上。测试这些问题的实质是最近获得批准的向空间望远镜科学研究所提出的525轨道建议的最高目标。在此过程中，将在14个波段中观察到25个精心挑选的星系团。这将是哈勃太空望远镜有史以来最大的观测活动之一。我们参与了这个项目，并提议解决它所有的引力透镜问题。我们希望在强透镜和弱透镜联合分析的基础上，构建包含误差条的精确质量图，推导出浓度参数和有效爱因斯坦半径，并将其与理论预测进行比较，分析可能偏差的意义，并从几何上检验角直径距离与红移之间的关系，以便约束宇宙的膨胀速率。即将进行的聚类样本将是本研究的理想观测基础。

项目成果

HUBBLE SPACE TELESCOPE COMBINED STRONG AND WEAK LENSING ANALYSIS OF THE CLASH SAMPLE: MASS AND MAGNIFICATION MODELS AND SYSTEMATIC UNCERTAINTIES

哈勃太空望远镜结合强弱透镜分析碰撞样本：质量和放大率模型以及系统不确定性

• DOI: 10.1088/0004-637x/801/1/44
• 发表时间: 2015
• 期刊: The Astrophysical Journal
• 作者: A. Zitrin;A. Fabris;J. Merten;P. Melchior;M. Meneghetti;A. Koekemoer;D. Coe;M. Maturi;M. Bartelmann;M. Postman;K. Umetsu;G. Seidel;I. Sendra;T. Broadhurst;I. Balestra;A. Biviano;C. Grillo;A. Mercurio;M. Nonino;P. Rosati;L. Bradley
• 通讯作者: L. Bradley

Reconstructing the projected gravitational potential of Abell 1689 from X-ray measurements

根据 X 射线测量重建 Abell 1689 的预计引力势

• DOI: 10.1051/0004-6361/201323242
• 发表时间: 2015
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: C. Tchernin;C. L. Majer;S. Meyer;E. Sarli;D. Eckert;M. Bartelmann
• 通讯作者: M. Bartelmann

Joint reconstruction of the mass distributions of galaxyclusters from gravitational lensing and thermal gas

• DOI: 10.11588/heidok.00017156
• 发表时间: 2014
• 作者: Charles L. Majer

An algorithm for the reconstruction of the projected gravitational potential of galaxy clusters from galaxy kinematics

从星系运动学重建星系团投影引力势的算法

• DOI: 10.11588/heidok.00020178
• 发表时间: 2015
• 作者: E. Sarli-Waizmann

The strongest gravitational lenses - II. Is the large Einstein radius of MACS J0717.5+3745 in conflict with ΛCDM?

最强引力透镜 - II MACS J0717 5 3745 的大爱因斯坦半径与 ÎCDM 冲突吗？

• DOI: 10.1051/0004-6361/201219944
• 发表时间: 2012
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: J.-C. Waizmann;M. Redlich;M. Bartelmann
• 通讯作者: M. Bartelmann