Fast and precise map-making for massively multi-detector CMB experiments
Future cosmic microwave background (CMB) polarisation experiments aim to measure an unprecedentedly small signal - the primordial gravity wave component of the polarisation field B-mode. To achieve this, they will analyse huge datasets, involving years worth of time-ordered data (TOD) from massively...
| Hlavní autoři: | , , , , , , , , |
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| Médium: | Journal article |
| Jazyk: | English |
| Vydáno: |
2009
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| _version_ | 1826296647781449728 |
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| author | Sutton, D Zuntz, J Ferreira, P Brown, M Eriksen, H Johnson, B Kusaka, A Naess, S Wehus, I |
| author_facet | Sutton, D Zuntz, J Ferreira, P Brown, M Eriksen, H Johnson, B Kusaka, A Naess, S Wehus, I |
| author_sort | Sutton, D |
| collection | OXFORD |
| description | Future cosmic microwave background (CMB) polarisation experiments aim to measure an unprecedentedly small signal - the primordial gravity wave component of the polarisation field B-mode. To achieve this, they will analyse huge datasets, involving years worth of time-ordered data (TOD) from massively multi-detector focal planes. This creates the need for fast and precise methods to complement the M-L approach in analysis pipelines. In this paper, we investigate fast map-making methods as applied to long duration, massively multi-detector, ground-based experiments, in the context of the search for B-modes. We focus on two alternative map-making approaches: destriping and TOD filtering, comparing their performance on simulated multi-detector polarisation data. We have written an optimised, parallel destriping code, the DEStriping CARTographer DESCART, that is generalised for massive focal planes, including the potential effect of cross-correlated TOD 1/f noise. We also determine the scaling of computing time for destriping as applied to a simulated full-season data-set for a realistic experiment. We find that destriping can out-perform filtering in estimating both the large-scale E and B-mode angular power spectra. In particular, filtering can produce significant spurious B-mode power via EB mixing. Whilst this can be removed, it contributes to the variance of B-mode bandpower estimates at scales near the primordial B-mode peak. For the experimental configuration we simulate, this has an effect on the possible detection significance for primordial B-modes. Destriping is a viable alternative fast method to the full M-L approach that does not cause the problems associated with filtering, and is flexible enough to fit into both M-L and Monte-Carlo pseudo-Cl pipelines. |
| first_indexed | 2024-03-07T04:19:34Z |
| format | Journal article |
| id | oxford-uuid:ca8e6de6-6b3b-405b-9f56-8a5e9cfb45f1 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T04:19:34Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | oxford-uuid:ca8e6de6-6b3b-405b-9f56-8a5e9cfb45f12022-03-27T07:08:18ZFast and precise map-making for massively multi-detector CMB experimentsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ca8e6de6-6b3b-405b-9f56-8a5e9cfb45f1EnglishSymplectic Elements at Oxford2009Sutton, DZuntz, JFerreira, PBrown, MEriksen, HJohnson, BKusaka, ANaess, SWehus, IFuture cosmic microwave background (CMB) polarisation experiments aim to measure an unprecedentedly small signal - the primordial gravity wave component of the polarisation field B-mode. To achieve this, they will analyse huge datasets, involving years worth of time-ordered data (TOD) from massively multi-detector focal planes. This creates the need for fast and precise methods to complement the M-L approach in analysis pipelines. In this paper, we investigate fast map-making methods as applied to long duration, massively multi-detector, ground-based experiments, in the context of the search for B-modes. We focus on two alternative map-making approaches: destriping and TOD filtering, comparing their performance on simulated multi-detector polarisation data. We have written an optimised, parallel destriping code, the DEStriping CARTographer DESCART, that is generalised for massive focal planes, including the potential effect of cross-correlated TOD 1/f noise. We also determine the scaling of computing time for destriping as applied to a simulated full-season data-set for a realistic experiment. We find that destriping can out-perform filtering in estimating both the large-scale E and B-mode angular power spectra. In particular, filtering can produce significant spurious B-mode power via EB mixing. Whilst this can be removed, it contributes to the variance of B-mode bandpower estimates at scales near the primordial B-mode peak. For the experimental configuration we simulate, this has an effect on the possible detection significance for primordial B-modes. Destriping is a viable alternative fast method to the full M-L approach that does not cause the problems associated with filtering, and is flexible enough to fit into both M-L and Monte-Carlo pseudo-Cl pipelines. |
| spellingShingle | Sutton, D Zuntz, J Ferreira, P Brown, M Eriksen, H Johnson, B Kusaka, A Naess, S Wehus, I Fast and precise map-making for massively multi-detector CMB experiments |
| title | Fast and precise map-making for massively multi-detector CMB experiments |
| title_full | Fast and precise map-making for massively multi-detector CMB experiments |
| title_fullStr | Fast and precise map-making for massively multi-detector CMB experiments |
| title_full_unstemmed | Fast and precise map-making for massively multi-detector CMB experiments |
| title_short | Fast and precise map-making for massively multi-detector CMB experiments |
| title_sort | fast and precise map making for massively multi detector cmb experiments |
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