Map-based E/B separation of filtered timestreams using space-based E-mode observations
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| Format: | Preprint |
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2024
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| _version_ | 1866929719853711360 |
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| author | Zhou, Yuyang Lee, Adrian Chinone, Yuji |
| author_facet | Zhou, Yuyang Lee, Adrian Chinone, Yuji |
| contents | E to B mixing or "leakage" due to time-ordered data (TOD) filtering has become an important source of sensitivity loss that ground-based cosmic microwave background polarization experiments must address. However, it is a difficult problem for which very few viable solutions exist. In this paper, we expand upon satellite E-mode methods to cover E/B leakage specifically due to TOD filtering. We take a satellite E-mode map and TOD filter it through the ground-based experiment data analysis pipeline, from which we construct a map-space "leakage template" and subtract it from the ground-based experiment map. We evaluate the residual leakage by simulating the satellite E-mode maps with Planck-like and LiteBIRD-like noise levels, and simulate the ground-based experiment with Simons Observatory-like and CMB-S4-like noise levels. The effectiveness of the method is measured in the improvement of the Fisher uncertainty $σ(r=0)$. We find that our method can reduce $σ(r=0)$ by $\sim15\text{--}75\%$ depending on the noise levels considered. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_11440 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Map-based E/B separation of filtered timestreams using space-based E-mode observations Zhou, Yuyang Lee, Adrian Chinone, Yuji Cosmology and Nongalactic Astrophysics E to B mixing or "leakage" due to time-ordered data (TOD) filtering has become an important source of sensitivity loss that ground-based cosmic microwave background polarization experiments must address. However, it is a difficult problem for which very few viable solutions exist. In this paper, we expand upon satellite E-mode methods to cover E/B leakage specifically due to TOD filtering. We take a satellite E-mode map and TOD filter it through the ground-based experiment data analysis pipeline, from which we construct a map-space "leakage template" and subtract it from the ground-based experiment map. We evaluate the residual leakage by simulating the satellite E-mode maps with Planck-like and LiteBIRD-like noise levels, and simulate the ground-based experiment with Simons Observatory-like and CMB-S4-like noise levels. The effectiveness of the method is measured in the improvement of the Fisher uncertainty $σ(r=0)$. We find that our method can reduce $σ(r=0)$ by $\sim15\text{--}75\%$ depending on the noise levels considered. |
| title | Map-based E/B separation of filtered timestreams using space-based E-mode observations |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2411.11440 |