Exploring the Universe with radio and optical galaxy surveys

通过射电和光学星系巡天探索宇宙

• 批准号: MR/X005399/1
• 负责人: Alkistis Pourtsidou
• 金额: $ 72.55万
• 依托单位: University of Edinburgh
• 依托单位国家: 英国
• 项目类别: Fellowship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=MR%2FX005399%2F1
• 关键词: Exploring; Universe; radio; optical; galaxy

This project will provide the largest 3-dimensional map of the Universe, covering 12 billion years of cosmic history. It will exploit radio intensity mapping and optical galaxy surveys to deliver measurements that are at least 10 times better than the current state-of-the-art. Innovative observational, computational, and statistical methods will be used to answer two of the most important questions in astrophysics: what is the nature of dark energy, and how galaxies evolve. To answer these questions, optical galaxy surveys with major UK involvement are going to be used as the main resource for precision cosmology in this decade. Forthcoming state-of-the-art cosmological experiments like ESA's Euclid satellite mission will scan huge volumes and answer fundamental questions about the Universe's beginning, evolution, and late time accelerated expansion. At the same time, radio observations of the redshifted neutral hydrogen 21cm line and new instruments like the SKA Observatory (SKAO) and its MeerKAT precursor, will provide a novel way to explore and understand the Universe.The project has two overarching aims: the first aim is to kick-off the era of precision cosmology using radio telescopes like MeerKAT and the SKAO. I am leading the development of an innovative technique to detect the target signal, called "neutral hydrogen intensity mapping". This technique can revolutionise our understanding of galaxy evolution and cosmology, but it is currently severely limited by systematic effects and lack of realistic simulations. The project will deliver the new simulations and analysis methods needed in order to establish intensity mapping as a key resource for cosmology. The second aim is to address the biggest theoretical challenge in optical galaxy surveys such as ESA's Euclid mission. Most of the high precision data these surveys deliver are within the small-scale regime, which is extremely challenging to model. Without significant progress, the global error budget will be limited by our theoretical understanding rather than statistical or systematic errors. The project will ensure the models catch up with the data sensitivity and develop new analysis techniques using machine learning technologies. This grant will consolidate the world-leading position of the UKRI FLF research group initiated by Alkistis Pourtsidou.

该项目将提供宇宙最大的三维地图，涵盖宇宙历史的120亿年。它将利用无线电强度映射和光学星系调查来提供至少比当前最新的测量值10倍。创新的观察，计算和统计方法将用于回答天体物理学中最重要的两个问题：黑暗能量的本质是什么，星系的发展方式。为了回答这些问题，在这十年中，将使用具有英国主要参与的光学银河调查作为精确宇宙学的主要资源。 ESA的Euclid卫星任务等即将到来的最先进的宇宙学实验将扫描巨大的数量，并回答有关宇宙开始，进化和较晚时间的基本问题。 At the same time, radio observations of the redshifted neutral hydrogen 21cm line and new instruments like the SKA Observatory (SKAO) and its MeerKAT precursor, will provide a novel way to explore and understand the Universe.The project has two overarching aims: the first aim is to kick-off the era of precision cosmology using radio telescopes like MeerKAT and the SKAO.我正在领导一种创新技术的开发，以检测目标信号，称为“中性氢强度映射”。这种技术可以彻底改变我们对银河发展和宇宙学的理解，但目前受到系统效应和缺乏现实模拟的严重限制。该项目将提供新的模拟和分析方法，以建立强度映射作为宇宙学的关键资源。第二个目的是应对诸如ESA的Euclid Mission之类的光学星系调查中最大的理论挑战。这些调查提供的大多数高精度数据都在小规模的制度范围内，这对于模型来说是极具挑战性的。没有明显的进展，全球错误预算将受到我们的理论理解而不是统计或系统错误的限制。该项目将确保模型赶上数据敏感性，并使用机器学习技术开发新的分析技术。这笔赠款将巩固由Alkistis Pourtsidou发起的UKRI FLF研究小组的世界领先地位。