Science Opportunities Unique to the LWA

LWA 独有的科学机会

• 批准号: 1835400
• 负责人: Gregory Taylor
• 金额: $ 62.04万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1835400&HistoricalAwards=false
• 关键词: Science; Opportunities; Unique; LWA

This project will support operations of the Long Wavelength Array (LWA) which provides access to the little explored part of the electromagnetic spectrum below 100 MHz. This region includes the recently detected sky-averaged absorption feature at 78 MHz from cosmic dawn when the first stars began to shine and the Universe was only 180 million years old. The LWA, operated by the University of New Mexico, is one of the last remaining University Radio Observatories. Such facilities are essential training grounds for the next generation of instrument builders. Students and post-docs, both at UNM and other US Universities, play an essential role as developers and users.With this project the highly successful first station of the Long Wavelength Array (LWA1) will be converted to a multi-site observatory by combining LWA1 with the new LWA station at Sevilleta (LWA-SV), and the new low-frequency capability on the Very Large Array (VLA). This expanded LWA (ELWA) will overcome the primary limitation of LWA1 -- angular resolution -- and make the observatory competitive with any other instrument in the world operating in this frequency range. This new capability will be offered to the community in regular calls for proposals. At the same time the existing LWA1 and LWA-SV stations will also be open to the community either separately or together. The LWA stations consist of 256 dual-polarization dipoles, which are digitized and combined into beams, or cross-correlated to form all-sky images. With its high temporal (50 nanoseconds), and high spectral (1 Hz) resolution the LWA is making major contributions to established fields (Jupiter and Solar bursts, pulsars, ionosphere), and opening up new areas of study (radio bursts from fireballs, pulsar environments, and detections or limits on new transients such as gravitational wave sources).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.

该项目将支持长波长阵列 (LWA) 的运行，该阵列提供对 100 MHz 以下电磁频谱中很少被探索的部分的访问。 该区域包括最近在宇宙黎明时检测到的 78 MHz 天空平均吸收特征，当时第一批恒星开始发光，宇宙只有 1.8 亿年的历史。 LWA 由新墨西哥大学运营，是仅存的大学无线电天文台之一。 这些设施是下一代仪器制造商必不可少的培训场地。 新墨西哥大学和其他美国大学的学生和博士后作为开发人员和用户发挥着重要作用。通过该项目，非常成功的长波长阵列（LWA1）第一站将通过结合LWA1 带有位于塞维利亚塔的新 LWA 站 (LWA-SV)，以及甚大阵列 (VLA) 上的新低频功能。 这种扩展的 LWA (ELWA) 将克服 LWA1 的主要限制——角分辨率——并使该天文台能够与世界上在此频率范围内运行的任何其他仪器竞争。 这项新功能将通过定期征求建议的方式向社区提供。 同时，现有的LWA1和LWA-SV车站也将单独或一起向社区开放。 LWA 站由 256 个双偏振偶极子组成，这些偶极子被数字化并组合成波束，或互相关以形成全天空图像。 凭借其高时间（50 纳秒）和高光谱（1 Hz）分辨率，LWA 对现有领域（木星和太阳爆发、脉冲星、电离层）做出了重大贡献，并开辟了新的研究领域（火球射电爆发、脉冲星环境，以及对新瞬变（如引力波源）的检测或限制）。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力优点和更广泛的评估进行评估，被认为值得支持影响审查标准。

项目成果

Experimenting With Frequency‐And‐Angular Sounding to Characterize Traveling Ionospheric Disturbances Using the LWA‐SV Radio Telescope and A DPS4D

使用 LWA–SV 射电望远镜和 DPS4D 进行频率和角度探测实验，以表征行进电离层扰动

• DOI: 10.1029/2018rs006690
• 发表时间: 2019
• 期刊: Radio Science
• 影响因子: 1.6
• 作者: Obenberger, K. S.;Dao, E.;Dowell, J.D.
• 通讯作者: Dowell, J.D.

Scattering Study of Pulsars below 100 MHz Using LWA1

• DOI: 10.3847/1538-4357/ab0d8f
• 发表时间: 2019-03
• 期刊: The Astrophysical Journal
• 作者: K. Bansal;G. Taylor;K. Stovall;J. Dowell

Lightning Interferometry with the Long Wavelength Array

长波长阵列闪电干涉测量

• DOI: 10.3390/rs15143657
• 发表时间: 2023
• 期刊: Remote Sensing
• 影响因子: 5
• 作者: Stock, Michael;Tilles, Julia;Taylor, Greg;Dowell, Jayce;Liu, Ningyu
• 通讯作者: Liu, Ningyu

Using the Long Wavelength Array to Search for Cosmic Dawn

利用长波长阵列寻找宇宙黎明

• DOI: 10.1142/s2251171720500087
• 发表时间: 2020
• 期刊: Journal of Astronomical Instrumentation
• 影响因子: 1.3
• 作者: DiLullo, Christopher;Taylor, Gregory B.;Dowell, Jayce
• 通讯作者: Dowell, Jayce

A real-time, all-sky, high time resolution, direct imager for the long wavelength array

• DOI: 10.1093/mnras/stz1206
• 发表时间: 2019-04
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: J. Kent;J. Dowell;A. Beardsley;N. Thyagarajan;G. Taylor;J. Bowman