Probing galaxy formation in the local universe: dwarf irregular galaxies and their globular cluster systems as galactic building blocks

探测本地宇宙中的星系形成：矮不规则星系及其作为星系构建块的球状星团系统

• 批准号: 98116682
• 负责人: Dr. Iskren Y. Georgiev
• 金额: --
• 依托单位: European Space Agency
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/98116682?language=en
• 关键词: Probing; galaxy; formation; local; universe

The assembly history of galaxies remains one of the most pressing questions in astrophysics to be solved today. In the currently popular hierarchical merging scenario, massive galaxies are believed to grow via numerous mergers. Dwarf irregular (dIrr) galaxies are widely regarded as being closest in resemblence to their pre-galactic building blocks. Hence, a study of the old globular clusters (GCs) in dIrr galaxies (whose properties reflect the physical conditions at the time of their early formation) and a comparison with GCs in massive galaxies can be used to quantify the contribution of dlrr galaxies to the assembly of massive present-day galaxies and their globular cluster systems (GCS). An excellent example for the need of such a study is the GCS of our Galaxy, because it is found to harbor a sub-population of GCs whose properties (colors, luminosities, horizontal branch morphologies, structural parameters and orbital kinematics) suggest that they might have formed in low-mass satellites and were later incorporated into the Milky Way GCS.The goal of the project is to investigate the properties of GCs in dlrr galaxies. This will allow to 1) constrain the contribution of dlrrs to the assembly of GCSs in massive galaxies; 2) probe the origin of chemically peculiar GCs in our Galaxy; 3) investigate the puzzling mass-metallicity relation among metal-poor GCs; 4) assess horizontal branch morphologies for GCs in dlrrs.Here support to achieve the science goals of the research programme is requested. The high level and diversity of astronomical research at the Argelander Institut für Astronomie (AlfA) of the University of Bonn will provide an excellent environment for this project.

星系的集会历史仍然是今天要解决的天体物理学中最紧迫的问题之一。在当前流行的分层合并方案中，据信大量的星系可以通过众多合并增长。矮人不规则（DIRR）星系被广泛认为是与半乳酸前的构建块相似的封闭。因此，可以使用对DIRR星系中旧的全球簇（GC）的研究（其特性反映了早期形成时的身体状况），并且可以使用与大型星系中的GC进行比较，以量化DLRR星系对大规模当前星系及其全球群集系统组装（GCS）的贡献。需要进行此类研究的一个很好的例子是我们银河系的GC，因为发现它具有对GC的亚群，其特性（颜色，发光性，水平分支形态，结构性参数和轨道运动学）的特性（颜色，水平分支）和轨道运动学表明，它们可能在低质量卫星中形成了属性，并将其属于Milky gcs的属性。星系。这将允许1）限制DLRR对大型星系中GCS组装的贡献； 2）探测我们银河系中化学奇特的GC的起源； 3）研究金属贫困GC之间的拼图质量金属关系； 4）评估DLRR中GCS的水平分支形态。在这里，请求实现研究计划的科学目标。波恩大学的阿格兰德学院（Argelander InstitutFür天文学研究所（Alfa））的天文学研究的高水平和多样性将为该项目提供一个绝佳的环境。

项目成果

New insights into the star formation histories of candidate intermediate-age early-type galaxies from K-band imaging of globular clusters

• DOI: 10.1111/j.1365-2966.2011.20115.x
• 发表时间: 2011-11
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: I. Georgiev;P. Goudfrooij;Thomas Bonn;H Germany;Stsci;Baltimore.;Usa;P. U. C. D. Chile;Santiago;Chile.