21 cm Power Spectrum Analysis of North Celestial Pole Observations with the Tianlai Dish Pathfinder Array
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arXiv
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866908961836367872 |
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| author | He, Guangzhi Zuo, Shifan Li, Jixia Li, Yichao Deng, Furen Sun, Shijie Ansari, Reza Perdereau, Olivier Timbie, Peter Stebbins, Albert Ibitoye, Ayodeji Wu, Fengquan Wang, Yougang Chen, Xuelei |
| author_facet | He, Guangzhi Zuo, Shifan Li, Jixia Li, Yichao Deng, Furen Sun, Shijie Ansari, Reza Perdereau, Olivier Timbie, Peter Stebbins, Albert Ibitoye, Ayodeji Wu, Fengquan Wang, Yougang Chen, Xuelei |
| contents | The Tianlai Dish Pathfinder Array (TDPA) is a radio interferometer designed to test techniques for 21 cm intensity mapping in the post-reionization universe as a means of measuring large-scale cosmic structure. Using 9 nights of observations targeting the North Celestial Pole (NCP) field, totaling approximately 107 hours of integration time, we analyze data in the frequency range 700-800 MHz (corresponding to redshift $z \sim 0.9$). We do the data format conversion, radio frequency interference (RFI) flagging, calibration, imaging and point source subtraction, and foreground removal via Singular Value Decomposition (SVD). The spherically averaged power spectrum $Δ^2(k)$ is obtained. This work successfully establishes and validates a comprehensive data analysis framework for the TDPA. We identify key improvements including sky model refinement, increased integration time, and pipeline optimization that will enable future detection of the 21 cm signal through auto-correlation and cross-correlation with optical galaxy surveys. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_12200 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | 21 cm Power Spectrum Analysis of North Celestial Pole Observations with the Tianlai Dish Pathfinder Array He, Guangzhi Zuo, Shifan Li, Jixia Li, Yichao Deng, Furen Sun, Shijie Ansari, Reza Perdereau, Olivier Timbie, Peter Stebbins, Albert Ibitoye, Ayodeji Wu, Fengquan Wang, Yougang Chen, Xuelei Instrumentation and Methods for Astrophysics Cosmology and Nongalactic Astrophysics The Tianlai Dish Pathfinder Array (TDPA) is a radio interferometer designed to test techniques for 21 cm intensity mapping in the post-reionization universe as a means of measuring large-scale cosmic structure. Using 9 nights of observations targeting the North Celestial Pole (NCP) field, totaling approximately 107 hours of integration time, we analyze data in the frequency range 700-800 MHz (corresponding to redshift $z \sim 0.9$). We do the data format conversion, radio frequency interference (RFI) flagging, calibration, imaging and point source subtraction, and foreground removal via Singular Value Decomposition (SVD). The spherically averaged power spectrum $Δ^2(k)$ is obtained. This work successfully establishes and validates a comprehensive data analysis framework for the TDPA. We identify key improvements including sky model refinement, increased integration time, and pipeline optimization that will enable future detection of the 21 cm signal through auto-correlation and cross-correlation with optical galaxy surveys. |
| title | 21 cm Power Spectrum Analysis of North Celestial Pole Observations with the Tianlai Dish Pathfinder Array |
| topic | Instrumentation and Methods for Astrophysics Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2604.12200 |