OzDES: Spectroscopy for the Dark Energy Survey

OzDES：暗能量调查的光谱学

• 批准号: ST/P000398/1
• 负责人: Michael Childress
• 金额: $ 23.26万
• 依托单位: University of Southampton
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=ST%2FP000398%2F1
• 关键词: OzDES; Spectroscopy; Dark; Energy; Survey

Observations of distant Type Ia supernovae revealed that the expansion of the Universe is currently accelerating, fueled by some mysterious substance dubbed "Dark Energy". Following this surprising discovery, the current challenge for astrophysicists is to characterise the behaviour of Dark Energy in precise detail, in order to gain some clues as to its physical origin. Significant effort and funding is now being devoted to this end, including major UK investment in the upcoming Large Synoptic Survey Telescope (LSST) which is poised to revolutionise our understanding of Dark Energy.One major challenge to this effort is the astrophysical diversity of the supernovae we use as "standard candles". Our ability to use these cataclysmic events to measure distances is dependent upon the intrinsic uniformity of their brightnesses. Recent work has indicated that the type of galaxy where a supernova occurs can cause a subtle shift in its final brightness, and this trend appears consistent with a slight dependence of the supernova brightness on the age of the star system which produced it. This presents a major difficulty for measuring the expansion history of the Universe because the light from very distant supernovae was produced at an earlier epoch of the Universe when stars were on average younger. Thus we could be comparing apples and oranges when comparing the brightnesses of nearby and distant supernovae to infer the expansion history of the Universe.This project aims to definitively address the evolving impact of this "age bias" on the brightnesses of Type Ia supernovae, so that we may use them precisely and accurately to determine the true expansion history of the Universe and thus the detailed nature of Dark Energy. We will use data from the OzDES spectroscopy programme and the Dark Energy Survey (DES) imaging programme to characterise the host galaxies of thousands of supernovae -- a factor of ten more than previous surveys. With these supernova host galaxies, we will precisely measure how the ages of supernovae affect their brightnesses at all epochs of cosmic time. This will enable the most precise measurement of the properties of Dark Energy ever made.This project will also serve as a perfect test bed for the techniques UK astronomers will employ for supernovae discovered by LSST. While DES represents a factor of ten increase in sample size over the previous generation of supernova experiments, LSST will outpace the DES supernova count by a factor of nearly one hundred. Thus astronomers must take the opportunity now to refine the programs and techniques we will employ on the massive flow of data that will arrive with the advent of LSST, and this project will do precisely that.

对遥远的IA型超新星的观察结果表明，宇宙的扩张目前正在加速，这是由于某种被称为“深色能量”的神秘物质所推动的。经过这一令人惊讶的发现，当前对天体物理学家的挑战是精确地表征黑能的行为，以便获得有关其物理起源的一些线索。现在，巨大的努力和资金致力于这一目的，包括英国对即将到来的大型天气调查望远镜（LSST）的重大投资，该投资有望彻底改变我们对黑暗能源的理解。这项工作的主要挑战是我们用作“标准蜡烛”的超新星的天体物理多样性。我们使用这些灾难性事件来测量距离的能力取决于其亮度的内在均匀性。最近的工作表明，超新星发生的星系类型会导致其最终亮度的细微转变，并且这种趋势似乎与超新星亮度对产生它的星系的年龄的略有依赖性一致。这给衡量宇宙的膨胀历史带来了主要的困难，因为当恒星平均年轻时，在较早的宇宙时期产生了非常遥远的超新星的光。因此，在比较附近和遥远的超新星的亮度以推断宇宙的扩展历史时，我们可以比较苹果和橙子。该项目旨在确定地解决这种“年龄偏见”对IA型超新星亮度的不断发展的影响，以便我们可以精确，精确地使用它们的精力来确定这些细节的精力，从而确定详细的细节。我们将使用来自OZDES光谱计划和暗能量调查（DES）成像程序的数据来表征数千个超新星的宿主星系，这比以前的调查多十倍。借助这些超新星宿主星系，我们将精确地衡量超新星的年龄在宇宙时间的所有时期都如何影响它们的亮度。这将实现对有史以来制作的黑能的性质的最精确的测量。该项目还将作为英国天文学家将使用LSST所发现的超新星的完美测试床。尽管DES比上一代超新星实验的样本量增加了十倍，但LSST将超过DES Supernova的数量近一倍。因此，天文学家现在必须借此机会来完善我们将在LSST出现的大量数据流中采用的程序和技术，该项目将正是这样做的。

项目成果

Rapidly evolving transients in the Dark Energy Survey

• DOI: 10.1093/mnras/sty2309
• 发表时间: 2018-03
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: M. Pursiainen;M. Childress;M. Smith;S. Prajs;M. Sullivan;T. Davis;R. Foley;J. Asorey;J. Asor

Dark Energy Survey year 1 results: Cosmological constraints from galaxy clustering and weak lensing

• DOI: 10.1103/physrevd.98.043526
• 发表时间: 2017-08
• 期刊: Physical Review D
• 影响因子: 5
• 作者: T. Abbott;F. Abdalla;A. Alarcon;J. Aleksić;S. Allam;S. Allen;A. Amara;J. Annis;J. Asorey-J.-As

Supernova host galaxies in the dark energy survey: I. Deep coadds, photometry, and stellar masses

• DOI: 10.1093/mnras/staa1302
• 发表时间: 2020-01
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: P. Wiseman;M. Smith;M. Childress;L. Kelsey;A. Moller;R. Gupta;E. Swann;C. Angus;D. Brout;T. Davis;R. Foley;C. Frohmaier;L. Galbany;C. Guti'errez;R. Kessler;G. Lewis;C. Lidman;E. MacAulay;R. Nichol;M. Pursiainen;M. Sako;D. Scolnic;N. E. Sommer;M. Sullivan;B. Tucker;T. Abbott;M. Aguena;S. Allam;S. Ávila;E. Bertin;D. Brooks;E. Buckley-Geer;D. Burke;A. Rosell;M. Kind;L. Costa;J. Vicente;S. Desai;H. Diehl;P. Doel;T. Eifler;S. Everett;P. Fosalba;J. Frieman;J. Garc'ia-Bellido;E. Gaztañaga;D. Gerdes;R. Gruendl;J. Gschwend;W. Hartley;S. Hinton;D. Hollowood;D. James;K. Kuehn;N. Kuropatkin;M. Lima;M. Maia;M. March;P. Martini;Peter Melchior;F. Menanteau;R. Miquel;R. Ogando;F. Paz-Chinch'on;A. Plazas;A. Romer;A. Roodman;E. Sánchez;V. Scarpine;S. Serrano;E. Suchyta;M. Swanson;G. Tarlé;D. Thomas;D. Tucker;T. Varga;A. Walker;R. Wilkinson

OzDES multifibre spectroscopy for the Dark Energy Survey: 3-yr results and first data release

用于暗能量调查的 OzDES 多光纤光谱：3 年结果和首次数据发布

• DOI: 10.1093/mnras/stx1872
• 发表时间: 2017
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Childress M