Analysis of new WHT, VLT, and SOAR observations: Confirming new galaxy clusters from Planck & Calibrating the masses of high-redshift SPT clusters via weak gravitational lensing for cosmological investigations

新的 WHT、VLT 和 SOAR 观测结果分析：确认来自普朗克的新星系团

• 批准号: 415537506
• 负责人: Professor Dr. Tim Schrabback
• 金额: --
• 依托单位: Institut für Astro- und Teilchenphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/415537506?language=en
• 关键词: Analysis; new; WHT; VLT; SOAR

We request DFG funding to conduct the scientific analysis of new observational data targeting massive high-redshift galaxy clusters and cluster candidates. These observations were obtained by the applicant as Principal Investigator via competitive international calls for open telescope time on major astronomical facilities. We will use our WHT observations to confirm new cluster candidates from the Planck Sunyaev-Zel’dovich (SZ) survey and to measure their redshift and richness.Our new VLT and SOAR observations, as well as complementary HST data, target massive high-redshift galaxy clusters from the South Pole Telescope (SPT) SZ survey. The analysis of these observations will allow us to calibrate the mass scale of massive distant clusters empirically via the measurement of weak gravitational lensing (WL) image distortions. These distortions are imprinted onto the shapes of background galaxies when their light bundles pass through the gravitational potential of the clusters.Our analysis will yield the tightest currently available cluster mass calibration at redshift z~0.9, and the first mass calibration for SZ clusters at z>1.2. These constraints will provide the missing piece that will allow us to simultaneously improve dark energy constraints from the SPT cluster sample and our understanding of the astrophysics of massive high-redshift galaxy clusters.

我们请求DFG资助对大质量高红移星系团和候选星系团的新观测数据进行科学分析。这些观测结果由申请人作为首席研究员通过在主要天文设施开放望远镜时间的竞争性国际呼吁获得。我们将利用我们的WHT观测来确认来自普朗克Sunyaev-Zel 'dovich （SZ）调查的新候选星团，并测量它们的红移和丰富度。我们新的VLT和SOAR观测，以及互补的HST数据，目标是来自南极望远镜（SPT） SZ调查的大质量高红移星系团。对这些观测结果的分析将使我们能够通过测量弱引力透镜（WL）图像畸变来经验地校准大质量遥远星团的质量尺度。当背景星系的光束穿过星系团的引力势时，这些扭曲就会印在它们的形状上。我们的分析将产生目前最严格的星团质量校准在红移z~0.9，以及SZ星团的第一个质量校准在z>1.2。这些限制将提供缺失的部分，使我们能够同时改进来自SPT星团样本的暗能量限制和我们对大质量高红移星系团的天体物理学的理解。