Collaborative Research: Hyper Suprime-Cam Wide Emission-Line Survey

合作研究：Hyper Suprime-Cam 宽发射线调查

基本信息

批准号：
1715145
负责人：
Amy Barger
金额：
$ 38.65万
依托单位：
University of Wisconsin-Madison
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-08-01 至 2022-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1715145&HistoricalAwards=false
关键词：
Collaborative Research Hyper Suprime Cam

项目摘要

The epoch of reionization, when the intergalactic gas went from being neutral and opaque to being very highly ionized, and therefore transparent, is a key period in the evolution of the Universe. Determining the redshift when this occurred and the sources of the photons that ionized the intergalactic gas represents one of the current frontiers in observational cosmology. The enormous recent progress in identifying populations of high-redshift galaxies, particularly the Lyman alpha emitting galaxies, has the potential to answer the question of when this process occurred. This project will develop large, homogeneous galaxy samples with which to determine the properties of the ultra-luminous galaxies at high redshift. An important aspect of this project is to provide research opportunities for graduate and undergraduate students that will engage their interest and encourage their participation in science, train them in observational methods and instruments, direct them in computer processing and reduction techniques for large imaging and spectroscopic data sets, and provide mentoring, with a particular emphasis on encouraging women students. Observations suggesting a drop in the high-redshift Lyman Alpha Emitter (LAE) fraction beyond a redshift of seven have been interpreted as marking the onset of reionization at this redshift. However, the most luminous LAEs do not appear to show such an evolution and may also exhibit more complex line profiles than lower-luminosity LAEs, suggesting that the most luminous LAEs are protecting themselves from the evolving neutrality of the IGM by generating highly ionized surroundings. As a consequence, the galaxy can be seen directly without scattering from the surrounding intergalactic medium. The aim of the proposed survey is to observe a 120 square degree field to moderate depth using Hyper Suprime-Cam on the Subaru telescope in order to develop a large uniformly-selected sample of very luminous LAEs, as well as a very large sample of more moderate-luminosity LAEs from which we can determine the properties of LAEs from redshift 5 to redshift 7. From these samples, the researchers will be able to determine how LAEs depend on environment and luminosity in this redshift range, as well as estimate the ionizing photon production in the most luminous LAEs and the growth of HII porosity. Determining properties of galaxies near the reionization boundary, and particularly their ionizing photon production, will provide strong constraints on theoretical models of the evolution of the intergalactic gas, the evolution of galaxies, and structure formation at high redshift.

当播放气体从中性和不透明变成非常高度电离，因此透明的时代是宇宙演变的关键时期时，电离时代的时期。确定当发生这种情况的红移，以及将光子间气体电离的光子来源代表观察宇宙学中当前的前沿之一。在识别高红移星系群体（尤其是Lyman Alpha发射星系）中，最近的巨大进展有可能回答有关此过程何时发生的问题。该项目将开发大型均质的星系样品，以确定高红移时超光星系的性能。该项目的一个重要方面是为研究生和本科生提供研究机会，以吸引他们的兴趣并鼓励他们参与科学，培训他们以观察方法和工具的培训，指导他们进入计算机处理和减少技术的技术和降低技术，以供大型成像和光谱数据集，并特别强调鼓励女性学生。观察结果表明，高红移Lyman Alpha发射极（LAE）的分数超过了7个红移，已被解释为标志着在这种红移时的电离开始。但是，最发光的LAE似乎没有显示出如此演变，并且可能比低亮度LAES表现出更复杂的线轮廓，这表明最发光的LAE通过产生高度离子化的环境来保护自己免受IgM不断发展的中立性的影响。结果，可以直接看到银河系，而无需从周围的银河系介质散射。 The aim of the proposed survey is to observe a 120 square degree field to moderate depth using Hyper Suprime-Cam on the Subaru telescope in order to develop a large uniformly-selected sample of very luminous LAEs, as well as a very large sample of more moderate-luminosity LAEs from which we can determine the properties of LAEs from redshift 5 to redshift 7. From these samples, the researchers will be able to determine how LAEs depend on environment and在此红移范围内的光度，并估计最发光的LAE中的电离光子产生和HII孔隙率的生长。确定电离边界附近的星系的性质，尤其是其电离光子产生，将在高红移时的呈乳层次气体进化，星系的演化以及高红移时的结构形成的理论模型中提供强大的限制。

项目成果

期刊论文数量（8）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

z ∼ 2.5–3 Ionizers in the GOODS-N Field

DOI：
10.3847/1538-4357/aacef8
发表时间：
2018-06
期刊：
The Astrophysical Journal
影响因子：
0
作者：
L. Jones;A. Barger;A. Barger;L. Cowie;P. Oesch;E. Hu;A. Songaila;R. P. Naidu
通讯作者：
L. Jones;A. Barger;A. Barger;L. Cowie;P. Oesch;E. Hu;A. Songaila;R. P. Naidu

Subaru/Hyper Suprime-Cam z-Broadband Excess Selection of Extreme Emission Line Galaxies at z < 1