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）的操作，该阵列（LWA）可访问100 MHz以下的电磁光谱的少量探索部分。 该地区包括最近恒星开始发光的宇宙黎明78 MHz的最近被发现的天空平均吸收功能，并且宇宙只有1.8亿年的历史。 LWA由新墨西哥大学运营，是最后剩下的大学无线电观测员之一。 这些设施是下一代仪器建造者的重要培训理由。 在UNM和其他美国大学的学生和职业生涯在开发人员和用户中都起着至关重要的作用。与该项目一起，长波长阵列（LWA1）非常成功的第一站将通过将LWA1与Sevilleta（LWA-SV）的新LWA站相结合，并将LWA1与新的LWA站相结合，以及非常庞大的低点（lwa-sv），以及新的低效率（vle new fler-free）。 扩展的LWA（ELWA）将克服LWA1的主要局限性（角度分辨率），并使天文台与在该频率范围内运行的世界上任何其他仪器的竞争力。 这种新的能力将通过常规呼吁提出建议提供给社区。 同时，现有的LWA1和LWA-SV站也将分别向社区开放。 LWA站由256个双极化偶极子组成，它们被数字化并组合成梁，或者交叉相关以形成全天空图像。 LWA凭借其高的时间（50纳秒）和高光谱（1 Hz）决议为建立的领域（木星和太阳能爆发，脉冲星，电离层）做出了重大贡献，并开放了新的研究领域（无线电领域（无线电爆发（无线电爆发）（来自火球，脉冲，脉冲，检测和统计的统计范围，以及诸如Gravitys的新型范围，并限制了诸如Gravitations的新型范围），并源于人们的新型范围。使用基金会的知识分子优点和更广泛的审查标准，被认为值得通过评估来支持。

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