Probing the Global 21-cm Signal via the Integrated Sachs-Wolfe Effect on the 21-cm Background
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arXiv
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866910328171790336 |
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| author | Ahn, Kyungjin Oh, Minji |
| author_facet | Ahn, Kyungjin Oh, Minji |
| contents | We propose a novel method to probe the global 21-cm background. This background experiences the integrated Sachs-Wolfe effect (ISW) as the cosmic microwave background does. The 21-cm ISW is modulated by the spectral shape of the global 21-cm signal, and thus the measure of the 21-cm ISW will be a probe of the evolution of the global signal. This strategy naturally mitigates the impact of the Milky Way foreground, which is a common and most significant challenge in conventional 21-cm background probes. With the phase-1 SKA telescope, probing the global 21-cm background would be feasible with a few 1000 hours of observation, enabling consistency checks with existing measures of the global 21-cm signal by EDGES and SARAS that are conflicting with each other. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2308_14808 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Probing the Global 21-cm Signal via the Integrated Sachs-Wolfe Effect on the 21-cm Background Ahn, Kyungjin Oh, Minji Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics We propose a novel method to probe the global 21-cm background. This background experiences the integrated Sachs-Wolfe effect (ISW) as the cosmic microwave background does. The 21-cm ISW is modulated by the spectral shape of the global 21-cm signal, and thus the measure of the 21-cm ISW will be a probe of the evolution of the global signal. This strategy naturally mitigates the impact of the Milky Way foreground, which is a common and most significant challenge in conventional 21-cm background probes. With the phase-1 SKA telescope, probing the global 21-cm background would be feasible with a few 1000 hours of observation, enabling consistency checks with existing measures of the global 21-cm signal by EDGES and SARAS that are conflicting with each other. |
| title | Probing the Global 21-cm Signal via the Integrated Sachs-Wolfe Effect on the 21-cm Background |
| topic | Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2308.14808 |