MRI: Development of the OVRO-LWA - A Low Frequency Radio Interferometric All-Sky Telescope

MRI：OVRO-LWA（低频射电干涉全天望远镜）的开发

• 批准号: 1828784
• 负责人: Gregg Hallinan
• 金额: $ 152.53万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-10-01 至 2024-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1828784&HistoricalAwards=false
• 关键词: MRI; Development; OVRO; LWA; Low

The concept of a radio telescope typically evokes imagery of giant dishes moving in unison, peering towards some small part of the sky. This notion is outdated - the Owens Valley Radio Observatory - Long Wavelength Array (OVRO-LWA) combines the signals from hundreds of small, cheap antennas to image the entire sky instantaneously, representing a revolutionary new generation of radio telescope. The resulting data stream is enormous (12 Petabytes per day), but Moore's Law has finally made it possible to continuously process and distill these data. By imaging all the sky, all the time, the OVRO-LWA can deliver a number of key science goals simultaneously. It can scan thousands of nearby stellar systems for the radio signature of exoplanet magnetospheres, a key ingredient for planetary habitability. It can probe our Cosmic Dawn, the earliest stages of our Universe when the very first stars formed. It will search the sky on nanosecond timescales for evidence of the highest energy cosmic rays, and it will provide continuous monitoring of the Sun (which is relevant for space weather), and Jovian system.This proposed program will progress the OVRO-LWA from a proof of concept to a continuously operational facility, and the most powerful radio telescope on the planet operating at low radio frequencies (100 MHz). The addition of 64 antennas will extend maximum baselines from 1.5 km to 2.6 km and will improve the snapshot sensitivity of the array by a factor of 3. The telescope receiver electronics will be replaced with a new generation of electronics board that can maintain 80 dB isolation between each of the 704 signal paths (352 dual polarization antennas), an essential requirement for detecting the weak polarized signatures of exoplanets as well as the Cosmic Dawn signal buried within the bright contaminating radio emission of our own Galaxy. The digital backend will be the most versatile instrument ever built for radio astronomy, being able to simultaneously image the entire sky, form 12 high time resolution beams that can be instantaneously repointed in any direction on the sky, and search the raw data from the telescope for cosmic ray radio showers lasting a few nanoseconds in duration. The additional installation of a 4.4 PB storage system will allow the OVRO-LWA to continuously execute these modes of operation simultaneously.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.

射电望远镜的概念通常会让人联想到巨大的碟形天线一致移动，凝视着天空的一小部分。欧文斯谷射电天文台长波长阵列（OVRO-LWA）将数百个小型廉价天线的信号结合起来，瞬间对整个天空进行成像，代表了革命性的新一代射电望远镜。由此产生的数据流是巨大的（每天12 PB），但摩尔定律最终使连续处理和提取这些数据成为可能。通过对所有天空进行成像，OVRO-LWA可以同时实现许多关键的科学目标。它可以扫描数千个附近的恒星系统，寻找系外行星磁层的无线电信号，这是行星可居住性的关键因素。它可以探测我们的宇宙黎明，当第一颗恒星形成时，我们宇宙的最早阶段。它将在纳秒时间尺度上搜索天空中最高能量宇宙射线的证据，并将提供对太阳（与空间天气有关）和木星系统的连续监测。这个拟议的计划将使OVRO-LWA从概念验证发展为连续运行的设施，并成为地球上在低无线电频率（100 MHz）下运行的最强大的射电望远镜。增加64个天线将把最大基线从1.5公里延长到2.6公里，并将把阵列的快照灵敏度提高3倍。望远镜接收器的电子设备将被新一代的电子板所取代，它可以在704个信号路径（352个双极化天线）之间保持80 dB的隔离，这是探测系外行星的弱极化特征以及隐藏在我们银河系明亮的污染无线电发射中的宇宙黎明信号的基本要求。数字后端将是有史以来为射电天文学建造的最通用的仪器，能够同时对整个天空进行成像，形成12个高时间分辨率的光束，可以瞬间重新指向天空的任何方向，并搜索来自望远镜的原始数据，以获得持续几纳秒的宇宙射线射电阵雨。额外安装的4.4 PB存储系统将使OVRO-LWA能够同时持续执行这些操作模式。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Time-Domain Science Pipelines for the OVRO-LWA

OVRO-LWA 的时域科学管道

• DOI: 10.23919/at-ap-rasc54737.2022.9814199
• 发表时间: 2022
• 期刊: 2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC
• 作者: Huang, Yuping;Laures, Mei-Ling;Anderson, Marin M.;Law, Casey J.;Hallinan, Gregg
• 通讯作者: Hallinan, Gregg

Synchrotron emission from virial shocks around stacked OVRO-LWA galaxy clusters

堆叠式 OVRO-LWA 星系团周围维里激波产生的同步辐射

• DOI: 10.1093/mnras/stad785
• 发表时间: 2023
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Hou, Kuan-Chou;Hallinan, Gregg;Keshet, Uri
• 通讯作者: Keshet, Uri

A Matched Survey for the Enigmatic Low Radio Frequency Transient ILT J225347+862146

• DOI: 10.3847/1538-4357/ac4048
• 发表时间: 2021-12
• 期刊: The Astrophysical Journal
• 作者: Yuping 宇平 Huang 黃;M. Anderson;G. Hallinan;T. Joseph W. Lazio;D. Price;Y. Sharma

Imaging Spectroscopy of CME-associated Solar Radio Bursts using OVRO-LWA

使用 OVRO-LWA 对日冕物质抛射相关的太阳射电暴进行成像光谱

• DOI: 10.3847/1538-4357/abc94b
• 发表时间: 2021
• 期刊: The Astrophysical Journal
• 作者: Chhabra, Sherry;Gary, Dale E.;Hallinan, Gregg;Anderson, Marin M.;Chen, Bin;Greenhill, Lincoln J.;Price, Danny C.
• 通讯作者: Price, Danny C.