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The third-order correlation functions of galaxy-galaxy lensing

星系-星系透镜效应的三阶相关函数

基本信息

批准号：
212738597
负责人：
Dr. Patrick Simon
金额：
--
依托单位：
Argelander-Institut für Astronomie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/212738597?language=en
关键词：
third order correlation functions galaxy

项目摘要

Third-order galaxy-galaxy lensing (G3L) promises to be the next generation tool in gravitational lensing for investigating the dark matter/galaxy connection. As the proposers demonstrated with their collaborators, G3L is readily measured with high significance from existing and upcoming data such as the CFHTLS. We still lack, however, a deeper understanding of what exactly is reflected in the new correlation functions of G3L. Preliminary work on one of the G3L correlation functions G – involving the stacked shear signal about pairs of lenses – implies that it provides a tool for probing the common (dark) matter environment of galaxy pairs. The project proposed here aims at advancing our theoretical understanding about G3L, in particular G, and, moreover, at testing existing models for galaxy formation and evolution within the dark matter density field against the available and upcoming observational data. To achieve better theoretical understanding, two doctoral thesis projects on G3L are proposed. First, a project on the theoretical modelling of G3L on two different complexity levels (a simplified and a sophisticated halo model) is proposed. The models will eventually be used to interpret observational data. A second project confronts forecasts from dark matter and galaxy models with the observational data. It is the goal of this step to provide input for improvements of existing galaxy models. Moreover, this project improves the amount of statistical information extracted from G by including radial distance information of the galaxies involved. Finally, both students will consider a hitherto unexplored variant of G, rendering it a cross-correlation function between different galaxy types.

三阶星系-星系透镜（G3 L）有望成为研究暗物质/星系联系的下一代引力透镜工具。正如提议者与他们的合作者所证明的那样，G3 L很容易从现有和即将到来的数据（如CFHTLS）中进行测量。然而，我们仍然缺乏对G3 L的新相关函数究竟反映了什么的更深入的理解。对G3 L相关函数G之一的初步研究--涉及透镜对的叠加剪切信号--意味着它为探测星系对的共同（暗）物质环境提供了一种工具。这里提出的项目旨在推进我们对G3 L，特别是G的理论理解，此外，还将针对现有和即将到来的观测数据测试暗物质密度场中星系形成和演化的现有模型。为了达到更好的理论理解，两个博士论文项目G3 L的建议。首先，提出了一个关于G3 L在两个不同复杂程度（简化和复杂的晕轮模型）上的理论建模的项目。这些模型最终将用于解释观测数据。第二个项目是用观测数据对暗物质和星系模型进行预测。这一步的目标是为改进现有的星系模型提供投入。此外，该项目通过包括所涉及的星系的径向距离信息，提高了从G中提取的统计信息量。最后，两位学生将考虑G的一个迄今为止尚未探索的变体，使其成为不同星系类型之间的互相关函数。