Mapping the Dynamic Radio Universe

绘制动态无线电宇宙图

• 批准号: RGPIN-2018-05738
• 负责人: Vanderlinde, Keith
• 金额: $ 2.48万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=685294
• 关键词: Mapping; Dynamic; Radio; Universe

Motivated by recent developments in radio astronomy, signal processing technologies, and novel capabilities at major observatories worldwide, I propose a program of study to based around synoptic observations of the dynamic radio sky. By leveraging new instruments such as the Canadian Hydrogen Intensity Mapping Experiment (CHIME), my group will be able to study a wide variety of radio phenomena previously inaccessible to observers.******The recent completion of the CHIME telescope marks a milestone for Canada's resurgent radio astronomical community: it will soon begin tracing out the largest volume of the cosmos ever explored in a single survey. Conceived as a cosmological experiment to map the Large Scale Structure (LSS) of the Universe, a variety of enhancements have made CHIME an unprecedented radio observatory, providing sensitivity on science targets with timescales ranging over 14 orders of magnitude, from microseconds to decades. Rather than using mirrors and lenses to image the sky, CHIME uses a massive digital signal processing backend to manipulate and focus the radio light in a variety of ways. Through careful replication and manipulation of the signals in the correlator, several commensal surveys are able to proceed in parallel with CHIME's primary LSS survey:***1) CHIME/pulsar will provide near-daily observation and monitoring of every known pulsar in the northern hemisphere.***2) CHIME/FRB will search for FRBs over a thousand beams, tiling the entire ~200-sq-deg field of view.***3) CHIME VLBI has restored the historic Very Long Baseline Interferometry (VLBI) link to the Algonquin Radio Observatory (ARO) in Ontario.***4) A high-spectral-resolution search for distant 21cm absorbing systems will begin shortly, with an ultimate potential to directly detect cosmic acceleration.******CHIME provides a prime example of the novel capabilities data sets now available, but this research extends well beyond a single observatory, leveraging new synoptic radio observatories now coming online around the globe. The refurbished ARO has been upgraded with similar technologies, allowing broadband VLBI, coherent polarimetry and time domain studies. The forthcoming 1024-dish Hydrogen Intensity and Realtime Analysis eXperiment (HIRAX) telescope in South Africa builds from CHIME technologies, expanding the sensitivity even further. We seek to explore these new windows on the Universe, addressing major questions across radio astronomy.******My group is leading developments within this new class of digital radio observatories exemplified by CHIME. We will continue to advance radio instrumentation, enhancing observational capabilities on facilities around the globe. Those new capabilities, coupled with the expertise built in developing them, will allow us to maximize scientific yield, exploring the dynamic radio sky in a way never before possible.

受射电天文学、信号处理技术和全球主要天文台新能力的最新发展的激励，我提出了一个基于动态射电天空天气观测的研究计划。通过利用诸如加拿大氢强度测绘实验（CHIME）之类的新仪器，我的小组将能够研究各种各样的无线电现象，这些现象以前是观察者无法接触到的。******最近完成的CHIME望远镜标志着加拿大复兴的射电天文社区的一个里程碑：它将很快开始追踪有史以来单次调查中探索的最大体积的宇宙。CHIME被设想为一个宇宙实验来绘制宇宙的大尺度结构（LSS），各种增强使CHIME成为一个前所未有的射电天文台，为科学目标提供了超过14个数量级的时间尺度，从微秒到几十年。CHIME不是使用镜子和透镜来成像天空，而是使用大量的数字信号处理后端以各种方式操纵和聚焦射电光。通过对相关器中信号的仔细复制和操作，几项共生巡天能够与CHIME的主要LSS巡天同时进行：***1)CHIME/脉冲星将提供对北半球每一颗已知脉冲星的近每日观测和监测。***2) CHIME/FRB将搜索超过一千束的FRB，覆盖整个~200平方度的视野。***3) CHIME VLBI已经恢复了与安大略省阿尔冈昆射电天文台（ARO）的历史悠久的甚长基线干涉测量（VLBI）链路。***4)对遥远的21cm吸收系统的高光谱分辨率搜索将很快开始，最终有可能直接探测到宇宙加速。******CHIME提供了目前可用的新能力数据集的一个主要例子，但这项研究远远超出了单个天文台，利用了全球各地正在上线的新天气无线电天文台。翻新后的ARO已经升级了类似的技术，允许宽带VLBI，相干偏振测量和时域研究。即将在南非建成的1024碟式氢强度和实时分析实验（HIRAX）望远镜采用了CHIME技术，进一步扩大了灵敏度。我们试图探索这些宇宙的新窗口，解决射电天文学的主要问题。******我的团队正在引领以CHIME为代表的新型数字射电天文台的发展。我们将继续推进无线电仪器，提高全球设施的观测能力。这些新的能力，加上在开发这些能力的过程中积累的专业知识，将使我们能够最大限度地提高科学成果，以一种前所未有的方式探索动态无线电天空。