Correlation-based Beam Calibration of 21 cm Intensity Mapping

Abstract Foreground removal presents a significant obstacle in both current and forthcoming intensity-mapping surveys. While numerous techniques have been developed that show promise in simulated data sets, their efficacy often diminishes when they are applied to real-world data. A primary issue is...

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Bibliographic Details
Published inThe Astrophysical journal. Supplement series Vol. 274; no. 2; pp. 44 - 57
Main Authors Ding, Jiacheng, Wang, Xin, Pen, Ue-Li, Li, Xiao-Dong
Format Journal Article
LanguageEnglish
Published Saskatoon The American Astronomical Society 01.10.2024
IOP Publishing
Subjects
Cosmology
Cross correlation
Datasets
Fluctuations
Large-scale structure of the universe
Mapping
Radio astronomy
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Summary:Abstract Foreground removal presents a significant obstacle in both current and forthcoming intensity-mapping surveys. While numerous techniques have been developed that show promise in simulated data sets, their efficacy often diminishes when they are applied to real-world data. A primary issue is the frequency-dependent variations in the instrumental response. In this paper, we propose a novel approach utilizing the internal cross correlation among different frequencies to calibrate the beam’s frequency fluctuations. Using a simulated data set that incorporates frequency-dependent random fluctuations into the beam model, we illustrate that our method can achieve considerable improvements over traditional techniques. Our results represent a step forward in enhancing the precision and reliability of foreground removal in intensity-mapping surveys.
Bibliography:Galaxies and Cosmology
AAS51431
ISSN:0067-0049
1538-4365
DOI:10.3847/1538-4365/ad6f0a