The early-type dwarf galaxy population in nearby galaxy clusters

该项目旨在研究附近的九头蛇I星系团和半人马座星系团以及NGC 1132和NGC 6482两个化石群中的早期矮星系的性质。该项目的进一步目标是对九头蛇I星系团中的超紧凑矮星系（ucd）和明亮球状星团进行完整的光谱普查。像本星系群（m87 <-10等）那样微弱的早期型矮星系到目前为止只在附近的室女座、天炉座和彗发星团中被研究过。利用VLT/VIMOS、VLT/FORSl和Subaru/Suprime-Cam新获得的光谱和光度观测数据，我们将拓宽以往研究的环境基线，以详细研究早型矮星系的频率、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星系团中矮星系的各种形成情景和演化模型，例如有核矮星系与ucd的可能联系。此外，九头蛇I中的ucd的恒星人口内容将与已发表的Fornax，室女座和半人马座的ucd进行比较，以扩展目前对这种特殊类型物体的理解。提出的研究计划是一个研究早期矮星系项目的延续。它于2007年由ESO/Garching发起，由博士生Ingo Misgeld发起。在这里，要求对整个研究计划的最后一年半的支持，以便Ingo Misgeld可以在路德维希马克西米利安大学（LMU）的Universitäts-Sternwarte m<e:1> nchen （USM）完成他的博士论文，这为提出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.