Formation histories of galactic halos via chemical abundance analyses of near-by stellar systems

通过附近恒星系统的化学丰度分析来了解银河晕的形成历史

• 批准号: 193251414
• 负责人: Privatdozent Dr. Andreas Koch
• 金额: --
• 依托单位: Department of Physics
• 依托单位国家: 德国
• 项目类别: Independent Junior Research Groups
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/193251414?language=en
• 关键词: Formation; histories; galactic; halos; via

I propose to establish a research group to investigate the formation of nearby galaxies, with a particular focus on the halos of our Milky Way galaxy and its nearest neighbour, the M31 galaxy. The aim is to measure chemical element abundances of stars in near-by dwarf galaxies and in globular clusters using high-resolution spectroscopy obtained with instruments at the ESO/VLT, LBT, Magellan, and Keck telescopes, and additional existing and archival data. These data will be analyzed using state-of-the-art techniques. By comparing the properties of the lowest-mass dwarf galaxies with star clusters in the outskirts of the Milky Way and with stars of the Galactic halo, it can be estimated to what extent such systems can be considered as building blocks of our Milky Way. Furthermore, it is believed that the dwarf galaxies are the sites of the earliest star formation in the Universe, which can be tagged via the chemical characteristics of their metal poor stars. Finally, narrowband photometry in the M31 halo will allow one to identify the predominant stellar populations in the outer regions and in substructures of this galaxy. From this, M31’s formation history can be efficiently reconstructed.

我建议成立一个研究小组来研究附近星系的形成，特别关注我们银河系及其最近的邻居M31星系的光晕。其目的是利用ESO/VLT、LBT、Magellan和Keck望远镜的仪器以及其他现有和档案数据，测量附近矮小星系和球状星团中恒星的化学元素丰度。这些数据将使用最先进的技术进行分析。通过将质量最低的矮星系与银河系外围的星团和银河晕恒星的性质进行比较，可以估计出这种系统在多大程度上可以被认为是我们银河系的基石。此外，矮星系被认为是宇宙中最早形成恒星的地方，可以通过它们的贫金属星的化学特征来标记。最后，M31晕的窄带测光将使人们能够确定该星系外部区域和亚结构中的主要恒星群。据此，可以有效地恢复M31‘S组的历史。

项目成果

Velocity and abundance precisions for future high‐resolution spectroscopic surveys: A study for 4MOST

未来高分辨率光谱调查的速度和丰度精度：4MOST 的研究

• DOI: 10.1002/asna.201211814
• 发表时间: 2013
• 期刊: Astronomische Nachrichten
• 影响因子: 0.9
• 作者: Caffau;Sbordone
• 通讯作者: Sbordone

THRESHING IN ACTION: THE TIDAL DISRUPTION OF A DWARF GALAXY BY THE HYDRA I CLUSTER

实际行动：九头蛇 I 星团对矮星系的潮汐扰动

• DOI: 10.1088/2041-8205/755/1/l13
• 发表时间: 2012
• 期刊: The Astrophysical Journal Letters
• 作者: Burkert;Collins;Hilker;Benson
• 通讯作者: Benson

A comprehensive chemical abundance study of the outer halo globular cluster M 75

外晕球状星团 M 75 的全面化学丰度研究

• DOI: 10.1051/0004-6361/201321392
• 发表时间: 2013
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: Kacharov;McWilliam
• 通讯作者: McWilliam

A DETECTION OF GAS ASSOCIATED WITH THE M31 STELLAR STREAM

与 M31 恒星流相关的气体的检测

• DOI: 10.1088/0004-637x/807/2/153
• 发表时间: 2015
• 期刊: The Astrophysical Journal
• 作者: Danforth;Keeney
• 通讯作者: Keeney

Stromgren uvby photometry of the peculiar globular cluster NGC 2419

• DOI: 10.1051/0004-6361/201526555
• 发表时间: 2015-09
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: M. Frank;A. Koch;S. Feltzing;N. Kacharov;M. Wilkinson;M. Irwin