The early-type dwarf galaxy population in nearby galaxy clusters

该项目旨在研究邻近星系团九头蛇一号和半人马座以及两个化石群NGC1132和NGC6482中的早期类型矮星系的性质。这个项目的另一个目标是对长蛇座星系团中的超致密矮星系(UCD)和明亮的球状星团进行全面的光谱普查。到目前为止，像本地群(M۷&lt；-10 MAG)中的早期类型矮星系只在附近的处女座、天幕和彗星团中被研究过。通过我们最近用VLT/VIMOS、VLT/FORS1和Subaru/SuPrime-Cam获得的新的光谱和光度观测，我们将拓宽以前研究的环境基线，以便详细研究早期类型矮小星系的频率、空间和运动学分布、恒星群含量以及全球光度和结构参数。这将使我们能够研究矮星系在星系团中的各种形成场景和演化模型，例如有核矮星系与UCD的可能联系。此外，九头蛇一号中UCD的恒星种群含量将与Fornax、Virgo和Centaurus中发表的UCDs的含量进行比较，以扩大目前对这类特殊天体的理解。拟议的研究计划是一个研究早期类型矮小星系的项目的继续。它是2007年在ESO/Garching为博士生Ingo Misgeld发起的。在这里，要求为整个研究计划的最后1.5年提供支持，以便Ingo Misgeld能够在路德维希马克西米利安大学(LMU)的Sternwarte München大学(USM)完成他的博士论文，该大学为拟议的科学提供了理想的环境。

This project aims at the investigation of the properties of early-type dwarf galaxies in the nearby galaxy clusters Hydra I and Centaurus as well as in the two fossil groups NGC 1132 and NGC 6482. A further goal of this project is a complete spectroscopic census of ultra-compact dwarf galaxies (UCDs) and bright globular clusters in the Hydra I galaxy cluster.Early-type dwarf galaxies as faint as those in the Local Group (M۷<-10 mag) have up to now only been investigated in the nearby clusters Virgo, Fornax and Coma. With our new spectroscopic and photometric observations, which were recently obtained with VLT/VIMOS, VLT/FORSl and Subaru/Suprime-Cam, we will broaden the environmental baseline of former studies in order to study in detail the frequency, the spatial and kinematical distribution, the stellar population content and the global photometric and structural parameters of early-type dwarf galaxies. This will enable us to investigate various formation scenarios and evolutionary models of dwarf galaxies in clusters, such as the possible link of nucleated dwarf galaxies to UCDs. Moreover, the stellar population content of UCDs in Hydra I will be compared with those published for UCDs in Fornax, Virgo and Centaurus in order to extend the current understanding of this peculiar type of objects.The proposed research programme is a continuation of a project which deals with the investigation of early-type dwarf galaxies. It was initiated in 2007 at ESO/Garching for and with the PhD student Ingo Misgeld. Here, support for the final 1.5 years of the entire research programme is requested, so that Ingo Misgeld can complete his PhD thesis at the Universitäts-Sternwarte München (USM) of the Ludwig Maximilians-University (LMU) which provides the ideal environment for the proposed science.