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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Published in | The Astrophysical journal. Supplement series Vol. 274; no. 2; pp. 44 - 57 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Saskatoon
The American Astronomical Society
01.10.2024
IOP Publishing |
Subjects | |
Online Access | Get full text |
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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. |
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Bibliography: | Galaxies and Cosmology AAS51431 |
ISSN: | 0067-0049 1538-4365 |
DOI: | 10.3847/1538-4365/ad6f0a |