Dark matter in spiral galaxies: the mass of their stellar disks

螺旋星系中的暗物质：恒星盘的质量

• 批准号: DP150104129
• 负责人: Prof Kenneth Freeman
• 金额: $ 28.33万
• 依托单位: The Australian National University
• 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 2018-06-30
• 项目状态: 已结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/DP150104129
• 关键词: Dark; matter; spiral; galaxies; mass

Spiral galaxies are immersed in vast halos of dark matter which make up more than 90% of their mass. The densities of the dark halos reflect the density of the expanding universe at the time when the halos condensed. The gravitational field of spirals and the density of the halos are measured from their rotation curves. For this analysis, the mass of their visible disks must be known, but it has not been possible to measure disk masses reliably until now. This project aims to exploit new instruments and improved analysis techniques to measure disk masses and halo densities accurately for the first time, and then to answer a central question of cosmology: when did galaxies of different masses form from the ancient expanding universe?

螺旋星系沉浸在巨大的暗物质晕中，暗物质晕占其质量的 90% 以上。暗晕的密度反映了晕凝结时膨胀宇宙的密度。螺旋的引力场和光晕的密度是根据它们的旋转曲线测量的。对于此分析，必须知道其可见圆盘的质量，但迄今为止还无法可靠地测量圆盘质量。该项目旨在利用新仪器和改进的分析技术，首次准确测量盘质量和晕密度，然后回答宇宙学的一个核心问题：不同质量的星系何时从古代膨胀的宇宙中形成？