Density profiles of sub-halos and dSph galaxies of the Milky Way

银河系亚晕和 dSph 星系的密度剖面

• 批准号: 39953056
• 负责人: Professor Dr. Pavel Kroupa
• 金额: --
• 依托单位: Helmholtz-Institut für Strahlen- und Kernphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/39953056?language=en
• 关键词: Density; profiles; sub; halos; dSph

The leading idea of all structure formation theories is that structures were born from small perturbations in the otherwise uniform distribution of matter in the early universe, which is supposed to be, to a great extent, dark. Cold dark matter (CDM) cosmology, even if very successful overall, predicts a large number of sub-structures in a galaxy-sized halo. The predicted number is much larger than the number of observed dwarf galaxies (the cosmological "sub-structure crisis")- Furthermore, the theoretical sub-halos have cuspy density profiles in contradiction to the cored profiles observed in the dwarf satellite galaxies in the MW (the cosmological "core problem"). The present project addresses the following issues: 1. We aim to study the "core problem" with a semi-analytical model that lakes into account the effects of random angular momentum and angular momentum acquired by tidal interaction with neighbouring proto-structures. 2. We also aim to study if and how dynamical friction can change density profile shapes. 3. We want to gain insights in the physics underlying the density profiles predicted by simulations, and therewith 4. to study the controversial universality of dark matter halo profiles.

所有结构形成理论的主要观点是，结构是由早期宇宙中物质均匀分布的微小扰动产生的，而早期宇宙在很大程度上被认为是黑暗的。冷暗物质（CDM）宇宙学，即使总体上非常成功，也预测了一个星系大小的晕中的大量子结构。预测的数量比观测到的矮星系的数量要大得多（宇宙学的“子结构危机”）——此外，理论的亚晕具有cuspy密度分布，与在MW中的矮卫星星系中观测到的核心分布相矛盾（宇宙学的“核心问题”）。本项目涉及以下问题：1。我们的目标是用一个考虑随机角动量和潮汐与邻近原结构相互作用所获得的角动量影响的半解析模型来研究“核心问题”。2. 我们还旨在研究动力摩擦是否以及如何改变密度剖面形状。3. 我们想要深入了解通过模拟预测的密度分布背后的物理原理。研究有争议的暗物质晕分布的普遍性。

项目成果

A census of the expected properties of classical Milky Way dwarfs in Milgromian dynamics

米尔格罗米亚动力学中经典银河系矮星预期特性的普查

• DOI: 10.1093/mnras/stu757
• 发表时间: 2014
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Lüghausen;Famaey;Kroupa
• 通讯作者: Kroupa