Collaborative Research: Cosmology with CHIME

合作研究：与 CHIME 的宇宙学

• 批准号: 2006548
• 负责人: Kevin Bandura
• 金额: $ 24.21万
• 依托单位: West Virginia University Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2006548&HistoricalAwards=false
• 关键词: Collaborative; Research; Cosmology; CHIME

The Canadian Hydrogen Intensity Mapping Experiment (CHIME) will help understand dark energy by mapping out the distribution of matter throughout the Universe. One of the greatest mysteries in science is that the expansion of the Universe is currently accelerating, implying that a mysterious dark energy permeates the Universe and pushes on it. The discovery of dark energy resulted in a Nobel Prize, but its nature is no clearer today than it was 20 years ago. In fact, more recent measurements have led to less certainty, with different measurements of exactly how fast the Universe is expanding. CHIME is a new radio telescope designed to measure distant galaxies through the radio emission of neutral hydrogen gas that resides within them. In order to measure the hydrogen emission, other bright radio signals from our own galaxy and other sources must be removed. This foreground removal requires a precise understanding of the CHIME instrument itself. This project will measure the instrument, improve nuisance radio emission removal, and combine the CHIME measurements with galaxy catalogues to make a measurement of dark energy. The program will also develop education-oriented radio receivers that will be used in STEM programs at MIT, WVU and Yale. Radio receivers for education have been developed through a partnership between WVU and the Green Bank Observatory to teach teachers the digital signal processing techniques necessary to build a digital spectrometer.Analysis will be undertaken that cross-correlates 21cm maps from CHIME with optical galaxy survey data from eBOSS to measure the large-scale structure (LSS) of the Universe. CHIME is designed to measure neutral hydrogen associated with galaxies at redshifts from 0.8 to 2.5, producing constraints on dark energy over a critical redshift range that is difficult to probe statistically with optical galaxy surveys alone. To make this measurement bright foreground emission from our own galaxy and extragalactic sources must be removed, which places stringent requirements on instrument calibration. In this program the researchers will attempt to measure the expansion history through: (i) improved instrument beam modelling, (ii) demonstrated foreground removal techniques, and (iii) the measurement of large-scale structure with 21cm emission in cross-correlation with eBOSS optical galaxies.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

加拿大氢强度测绘实验（CHIME）将通过绘制整个宇宙的物质分布来帮助理解暗能量。 科学界最大的谜团之一是宇宙正在加速膨胀，这意味着一种神秘的暗能量渗透到宇宙中并推动它。暗能量的发现导致了诺贝尔奖，但它的性质今天并不比20年前更清楚。 事实上，最近的测量结果导致确定性降低，对宇宙膨胀的速度有不同的测量。CHIME是一种新的射电望远镜，旨在通过驻留在星系中的中性氢气的无线电发射来测量遥远的星系。 为了测量氢的发射，必须移除来自我们银河系和其他来源的其他明亮的无线电信号。 这种前景移除需要对CHIME乐器本身有精确的理解。 该项目将测量仪器，改善干扰无线电发射的去除，并将CHIME测量与星系目录相结合，以测量暗能量。 该计划还将开发面向教育的无线电接收器，用于麻省理工学院、西弗吉尼亚大学和耶鲁大学的STEM项目。通过西弗吉尼亚大学和绿色岸天文台之间的伙伴关系，开发了教育用无线电接收器，向教师传授建造数字光谱仪所需的数字信号处理技术，将进行分析，将CHIME的21厘米图与eBOSS的光学星系巡天数据互相关，以测量宇宙的大尺度结构。CHIME被设计用来测量与星系相关的中性氢，其红移范围从0.8到2.5，在一个临界红移范围内对暗能量产生约束，而这个临界红移范围很难单独用光学星系调查进行统计探测。为了进行这种测量，必须去除来自我们自己的星系和河外源的明亮前景发射，这对仪器校准提出了严格的要求。 在这个项目中，研究人员将尝试通过以下方式测量膨胀历史：（一）改进的仪器射束建模，（二）经验证的前景消除技术，和（iii）21厘米发射的大尺度结构的测量，该奖项反映了NSF的法定使命，并通过使用基金会的智力价值和更广泛的评估被认为值得支持。影响审查标准。

项目成果

Detection of Cosmological 21 cm Emission with the Canadian Hydrogen Intensity Mapping Experiment

• DOI: 10.3847/1538-4357/acb13f
• 发表时间: 2022-02
• 期刊: The Astrophysical Journal
• 作者: Chime Collaboration;M. Amiri;K. Bandura;Tianyue Chen;M. Deng;M. Dobbs;M. Fandino;S. Foreman;M. Halpern;A. Hill;G. Hinshaw;Carolin Hofer;Joseph W. Kania;T. Landecker;Joshua MacEachern;K. Masui;J. Mena-Parra;N. Milutinovic;A. Mirhosseini;L. Newburgh;A. Ordog;U. Pen;T. Pinsonneault-Marotte;Ava Polzin;A. Reda;A. Renard;J. Shaw;S. Siegel;Saurabh Singh;K. Vanderlinde;Haochen Wang;D. Wiebe;D. Wulf

An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment

• DOI: 10.3847/1538-4365/ac6fd9
• 发表时间: 2022-01
• 期刊: The Astrophysical Journal Supplement Series
• 作者: M. Amiri;K. Bandura;Ana Boskovic;Tianyue Chen;J. Cliche;M. Deng;N. Denman;M. Dobbs;M. Fandino;S. Foreman;M. Halpern;D. Hanna;A. Hill;G. Hinshaw;C. Höfer;Joseph W. Kania;P. Klages;T. Landecker;Joshua MacEachern;K. Masui;J. Mena-Parra;N. Milutinovic;A. Mirhosseini;L. Newburgh;Rick Nitsche;A. Ordog;U. Pen;T. Pinsonneault-Marotte;Ava Polzin;A. Reda;A. Renard;J. Shaw;S. Siegel;Saurabh Singh;R. Smegal;I. Tretyakov;Kwinten Van Gassen;K. Vanderlinde;Haochen Wang;D. Wiebe;James S. Willis;D. Wulf

Using the Sun to Measure the Primary Beam Response of the Canadian Hydrogen Intensity Mapping Experiment

利用太阳测量加拿大氢强度测绘实验的主光束响应

• DOI: 10.3847/1538-4357/ac6b9f
• 发表时间: 2022
• 期刊: The Astrophysical Journal
• 作者: The CHIME Collaboration;Amiri, Mandana;Bandura, Kevin;Boskovic, Anja;Cliche, Jean-François;Deng, Meiling;Dobbs, Matt;Fandino, Mateus;Foreman, Simon;Halpern, Mark
• 通讯作者: Halpern, Mark