Inference of the optical depth to reionization from low multipole temperature and polarization Planck data
Inference of the optical depth to reionization from low multipole temperature and polarization Planck data
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从低多极温度和偏振普朗克数据推断再电离的光学深度
DOI:
10.1093/mnras/stab2215
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发表时间:
2021
影响因子:
4.8
通讯作者:
De Belsunce R
中科院分区:
文献类型:
--
作者:
De Belsunce R
This paper explores methods for constructing low multipole temperature and polarization likelihoods from maps of the cosmic microwave background anisotropies that have complex noise properties and partial sky coverage. We usePlanck2018 High Frequency Instrument (HFI) and updatedSRoll2temperature and polarization maps to test our methods. We present three likelihood approximations based on quadratic cross spectrum estimators: (i) a variant of the simulation-based likelihood (SimBaL) techniques used in thePlancklegacy papers to produce a low multipoleEElikelihood; (ii) a semi-analytical likelihood approximation (momento) based on the principle of maximum entropy; (iii) a density-estimation ‘likelihood-free’ scheme (delfi). Approaches (ii) and (iii) can be generalized to produce low multipole joint temperature-polarization (TTTEEE) likelihoods. We present extensive tests of these methods on simulations with realistic correlated noise. We then analyse thePlanckdata and confirm the robustness of our method and likelihoods on multiple inter- and intra-frequency detector set combinations ofSRoll2maps. The three likelihood techniques give consistent results and support a low value of the optical depth to reoinization, τ, from the HFI. Our best estimate of τ comes from combining the low multipoleSRoll2momento(TTTEEE) likelihood with theCamSpechigh multipole likelihood and is. This is consistent with theSRoll2team’s determination of τ, though slightly higher by ∼0.5σ, mainly because of our joint treatment of temperature and polarization.
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影响因子:
6.5
作者:
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通讯作者:
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影响因子:
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DOI:
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影响因子:
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