Correlation-based Beam Calibration of 21cm Intensity Mapping
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866914911366414336 |
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| author | Ding, Jiacheng Wang, Xin Pen, Ue-Li Li, Xiao-Dong |
| author_facet | Ding, Jiacheng Wang, Xin Pen, Ue-Li Li, Xiao-Dong |
| contents | 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 datasets, their efficacy often diminishes when 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 dataset 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_06682 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Correlation-based Beam Calibration of 21cm Intensity Mapping Ding, Jiacheng Wang, Xin Pen, Ue-Li Li, Xiao-Dong Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics 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 datasets, their efficacy often diminishes when 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 dataset 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. |
| title | Correlation-based Beam Calibration of 21cm Intensity Mapping |
| topic | Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2408.06682 |