Time takes its toll: understanding why galaxies slow down as they get older

时间会付出代价：理解为什么星系随着年龄的增长而减慢速度

• 批准号: FT210100168
• 负责人: Dr Caroline Foster
• 金额: $ 51.44万
• 依托单位: The University of New South Wales
• 依托单位国家: 澳大利亚
• 项目类别: ARC Future Fellowships
• 财政年份: 2022
• 资助国家: 澳大利亚
• 起止时间: 2022-02-07 至 2026-05-06
• 项目状态: 未结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/FT210100168
• 关键词: Time; takes; its; toll; understanding

The spin of galaxies is slowing down and nobody really knows why. This dynamical transformation is predicted by theoretical simulations, but different simulations disagree on its exact causes and their relative importance. Until recently, the data required to map the gas and stars in galaxies during the transition and identify its root causes in galaxies around 3-4 billion years ago were critically lacking. This project leverages on a new dataset designed to directly detect and address this important unknown. Expected outcomes are a reliable measurement of the dynamical evolution of galaxies, identification of its physical drivers and important new constraints for theoretical simulations of galaxy formation.

星系的旋转速度正在减慢，没有人真正知道为什么。理论模拟预测了这种动力学转变，但不同的模拟不同意其确切原因及其相对重要性。直到最近，在过渡期间绘制星系中的气体和恒星所需的数据，以及在大约30 - 40亿年前的星系中确定其根本原因所需的数据仍然严重缺乏。该项目利用了一个新的数据集，旨在直接检测和解决这个重要的未知问题。预期成果是对星系动态演化的可靠测量，确定其物理驱动因素，以及对星系形成的理论模拟的重要新限制。