Galactic archaeology — fossil evidence of how our Galaxy's disk formed

银河考古学——银河系圆盘如何形成的化石证据

• 批准号: DP150104667
• 负责人: Prof Timothy Bedding
• 金额: $ 30.62万
• 依托单位: The University of Sydney
• 依托单位国家: 澳大利亚
• 项目类别: Discovery Projects
• 财政年份: 2015
• 资助国家: 澳大利亚
• 起止时间: 2015-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/DP150104667
• 关键词: Galactic; archaeology; fossil; evidence; how

The vast stellar content of our Galaxy contains the fossil imprints of how it was formed. The current model for galaxy formation, the Cold Dark Matter (CDM) paradigm, is that they have built up over billions of years by the merging of smaller systems, but cosmological simulations fail to reproduce the key properties of individual galaxies. The predicted high level of merger activity makes it very difficult to form galaxies like our own. This is the key stumbling block to progress at the present time. The project aims to assess observationally how important mergers have been in the formation of the Galaxy, the critical test of CDM. The project will target the stars in the Galactic disk and bulge with the HERMES wide-field spectrograph.

我们银河系中巨大的恒星成分包含着其形成过程的化石印记。目前的星系形成模型，即冷暗物质（CDM）范式，是通过数十亿年的较小系统的合并而形成的，但宇宙学模拟无法重现单个星系的关键特性。预计的高水平合并活动使得形成像我们这样的星系非常困难。这是目前进展的关键绊脚石。该项目旨在通过观察评估合并在银河系形成过程中的重要性，这是清洁发展机制的关键考验。该项目将使用 HERMES 宽视场摄谱仪瞄准银盘和核球中的恒星。