Improvements to the Search for Cosmic Dawn Using the Long Wavelength Array

IF 1.5 Q3 ASTRONOMY & ASTROPHYSICS

Journal of Astronomical Instrumentation Pub Date : 2021-11-26 DOI:10.1142/S225117172150015X

C. Dilullo, J. Dowell, G. Taylor

引用次数: 0

Abstract

We present recent improvements to the search for the global Cosmic Dawn signature using the Long Wavelength Array station located on the Sevilleta National Wildlife Refuge in New Mexico, USA (LWA–SV). These improvements are both in the methodology of the experiment and the hardware of the station. An improved observing strategy along with more sophisticated temperature calibration and foreground modelling schemes have led to improved residual RMS limits. A large improvement over previous work using LWA–SV is the use of a novel achromatic beamforming technique which has been developed for LWA–SV. We present results from an observing campaign which contains 29 days of observations between March 10, 2021 and April 1

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长波阵列对宇宙黎明探测的改进

我们介绍了使用位于美国新墨西哥州塞维利亚国家野生动物保护区的长波阵列站（LWA–SV）搜索全球宇宙黎明特征的最新改进。这些改进既体现在实验方法上，也体现在工作站硬件上。改进的观测策略以及更复杂的温度校准和前景建模方案已经提高了残余RMS限值。与之前使用LWA–SV的工作相比，一个很大的改进是使用了一种新的消色差波束形成技术，该技术是为LWA–SV。我们展示了2021年3月10日至4月1日期间为期29天的观测活动的结果

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来源期刊

Journal of Astronomical Instrumentation ASTRONOMY & ASTROPHYSICS-

CiteScore

2.30

自引率

7.70%

发文量

期刊介绍： The Journal of Astronomical Instrumentation (JAI) publishes papers describing instruments and components being proposed, developed, under construction and in use. JAI also publishes papers that describe facility operations, lessons learned in design, construction, and operation, algorithms and their implementations, and techniques, including calibration, that are fundamental elements of instrumentation. The journal focuses on astronomical instrumentation topics in all wavebands (Radio to Gamma-Ray) and includes the disciplines of Heliophysics, Space Weather, Lunar and Planetary Science, Exoplanet Exploration, and Astroparticle Observation (cosmic rays, cosmic neutrinos, etc.). Concepts, designs, components, algorithms, integrated systems, operations, data archiving techniques and lessons learned applicable but not limited to the following platforms are pertinent to this journal. Example topics are listed below each platform, and it is recognized that many of these topics are relevant to multiple platforms. Relevant platforms include: Ground-based observatories[...] Stratospheric aircraft[...] Balloons and suborbital rockets[...] Space-based observatories and systems[...] Landers and rovers, and other planetary-based instrument concepts[...]