Measuring Tianlai's primary beam using sky model
Fuente:
arXiv
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866914498307162112 |
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| author | Geng, Yunbo Deng, Furen Li, Jixia Zuo, Shifan Sun, Shijie Li, Yichao Wu, Fengquan Wang, Yougang Chen, Xuelei |
| author_facet | Geng, Yunbo Deng, Furen Li, Jixia Zuo, Shifan Sun, Shijie Li, Yichao Wu, Fengquan Wang, Yougang Chen, Xuelei |
| contents | We present the beam pattern measurement of the Tianlai Cylinder Pathfinder Array. As it is a pure drift-scan instrument, we exploit the North-South motion of the Sun to demonstrate that the primary beam is factorizable. Leveraging this property, we decompose the primary beam into independent East-West (E-W) and North-South (N-S) components. Using the Sun as a calibration source, we obtain the E-W beam profiles at various elevations, applying normalization to eliminate the effects of solar activity. Subsequently, we simulate the observed signals using a sky map model to derive the best-fit N-S beam. The results of this work are consistent with previous expectations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_20262 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Measuring Tianlai's primary beam using sky model Geng, Yunbo Deng, Furen Li, Jixia Zuo, Shifan Sun, Shijie Li, Yichao Wu, Fengquan Wang, Yougang Chen, Xuelei Instrumentation and Methods for Astrophysics We present the beam pattern measurement of the Tianlai Cylinder Pathfinder Array. As it is a pure drift-scan instrument, we exploit the North-South motion of the Sun to demonstrate that the primary beam is factorizable. Leveraging this property, we decompose the primary beam into independent East-West (E-W) and North-South (N-S) components. Using the Sun as a calibration source, we obtain the E-W beam profiles at various elevations, applying normalization to eliminate the effects of solar activity. Subsequently, we simulate the observed signals using a sky map model to derive the best-fit N-S beam. The results of this work are consistent with previous expectations. |
| title | Measuring Tianlai's primary beam using sky model |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2604.20262 |