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The cosmic evolution of star-forming galaxies

恒星形成星系的宇宙演化

基本信息

批准号：
2581484
负责人：
金额：
--
依托单位：
University College London
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2021
资助国家：
英国
起止时间：
2021 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2581484
关键词：
cosmic evolution star forming galaxies

项目摘要

Our Universe is rather quiet now, but when it was half of its current age it was positively booming with star formation and the light from accretion onto black holes. In star-forming galaxies, short-lived massive stars pump out large amounts of ultraviolet light. We can track the history of star-formation over the Universe's history by measuring the space density of ultraviolet-emitting galaxies (how many there are per cubic megaparsec) as a function of redshift and luminosity. Ultraviolet radiation at wavelengths shorter than 350 nanometres is absorbed in the Earth's atmosphere. At high redshift, the ultraviolet emission is shifted into the optical, and ground-based telescopes do a grand job. But for the second half of the Universe's history, the measurements need ultraviolet measurements from Space. MSSL has built two ultraviolet telescopes that are in operation in space right now: the Optical/UV Monitor telescope onboard the European Space Agency's XMM-Newton observatory, and the Ultraviolet/Optical Telescope onboard NASA's Neil Gehrels Swift Observatory. This project is to use ultraviolet data from these two telescopes, together with a host of supporting multi-wavelength observations, to study the properties and evolution of star forming galaxies during their great decline, between redshift 1, when the Universe was about half of its current age, and the present day.

我们的宇宙现在相当安静，但当它是现在年龄的一半时，它正随着星星的形成和黑洞吸积产生的光而蓬勃发展。在恒星形成的星系中，寿命短的大质量恒星会发出大量的紫外线。我们可以通过测量发射紫外线的星系的空间密度（每立方兆秒差距有多少个）作为红移和光度的函数来跟踪宇宙历史上恒星形成的历史。波长短于350纳米的紫外线辐射在地球大气层中被吸收。在高红移时，紫外线发射被转移到光学，地面望远镜做了一个伟大的工作。但是对于宇宙历史的后半部分，测量需要来自太空的紫外线测量。MSSL已经建造了两台目前在太空中运行的紫外线望远镜：欧洲航天局XMM-牛顿天文台上的光学/紫外线监测望远镜，以及美国宇航局尼尔·盖尔斯·斯威夫特天文台上的紫外线/光学望远镜。该项目将利用这两台望远镜的紫外线数据，以及大量支持性的多波长观测，研究形成星星的星系在其大衰退期间的性质和演变，从红移1（当时宇宙大约是目前年龄的一半）到现在。