The Milky Way in the Context of Barred Galaxies: Dark Matter and (Chemo-) Dynamics

棒状星系背景下的银河系：暗物质和（化学）动力学

• 批准号: 392103545
• 负责人: Professor Dr. Ortwin Gerhard
• 金额: --
• 依托单位: Max-Planck-Institut für extraterrestrische Physik (MPE)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/392103545?language=en
• 关键词: Milky; Way; Context; Barred; Galaxies

Galaxies are basic building blocks of the Universe. Their formation and evolution, and the interplay between stellar and dark matter are among the most important problems in astrophysics. Here we propose a collaborative project to determine the distribution of baryonic and dark matter in the Milky Way Galaxy and in similar mass barred galaxies in the CALIFA survey. We will also investigate the gas dynamics and the (chemo-) dynamics of their stellar bars and disks, using state-of-the-art dynamical and gas-dynamical modelling. The unprecedented incoming data for the Milky Way (MW) from the Gaia satellite and from parallel survey observations are making the MW enormously important as a template for galaxy formation studies. From these data we will accurately determine its central dark matter cusp-core, and model the distribution of stellar orbits for stars of different chemical composition ('chemo-dynamics'). The CALIFA data provide powerful two-dimensional velocity information that will allow us to determine the stellar mass in the bars and disks of barred galaxies, and thus infer their dark matter distribution. Using the CALIFA abundance data we will obtain orbit distributions of stellar populations similar to the Milky Way. The evolution of the dark matter profile and the chemo-dynamical growth of galaxies are an important part of the formation history of galaxies, where we will be able to place the MW in the context of its siblings.

星系是宇宙的基本组成部分。它们的形成和演化，以及恒星和暗物质之间的相互作用是天体物理学中最重要的问题之一。在这里，我们提出了一个合作项目，以确定银河系和 CALIFA 调查中类似的质量棒星系中重子和暗物质的分布。我们还将使用最先进的动力学和气体动力学模型来研究其恒星棒和恒星盘的气体动力学和（化学）动力学。来自盖亚卫星和平行巡天观测的前所未有的银河系 (MW) 数据使得 MW 作为星系形成研究的模板变得极其重要。根据这些数据，我们将准确确定其中心暗物质尖核，并对不同化学成分的恒星的恒星轨道分布进行建模（“化学动力学”）。 CALIFA 数据提供了强大的二维速度信息，使我们能够确定棒星系条和盘中的恒星质量，从而推断它们的暗物质分布。利用 CALIFA 丰度数据，我们将获得与银河系类似的恒星群的轨道分布。暗物质轮廓的演化和星系的化学动力学生长是星系形成历史的重要组成部分，我们将能够将MW置于其兄弟姐妹的背景下。