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Delouis, Jean Marc; Pagano, L.; Mottet, S.; Puget, J-l; Vibert, L.. |
This paper describes an improved map making approach with respect to the one used for the Planck High Frequency Instrument 2018 Legacy release. The algorithm SRo112 better corrects the known instrumental effects that still affected mostly the polarized large-angular-scale data by distorting the signal, and/or leaving residuals observable in null tests. The main systematic effect is the nonlinear response of the onboard analog-to-digital convertors that was cleaned in the Planck HFI Legacy release as an empirical time-varying linear detector chain response which is the first-order effect. The SRo112 method fits the model parameters for higher-order effects and corrects the full distortion of the signal. The model parameters are fitted using the redundancies... |
Tipo: Text |
Palavras-chave: Cosmology: observations; Cosmic background radiation; Surveys; Methods: data analysis. |
Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00513/62482/66802.pdf |
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Pagano, L.; Delouis, Jean Marc; Mottet, S.; Puget, J. -l.; Vibert, L.. |
We present an estimation of the reionization optical depth tau from an improved analysis of data from the High Frequency Instrument (HFI) on board the Planck satellite. By using an improved version of the HFI map-making code, we greatly reduce the residual large-scale contamination a ffecting the data, characterised in, but not fully removed from, the Planck 2018 legacy release. This brings the dipole distortion systematic e ffect, contaminating the very low multipoles, below the noise level. On large-scale polarization-only data, we measure tau = 0.0566(-0).(+0)(0062).(0053) at 68% C.L., reducing the Planck 2018 legacy release uncertainty by similar to 40%. Within the Lambda CDM model, in combination with the Planck large-scale temperature likelihood, and... |
Tipo: Text |
Palavras-chave: Cosmic background radiation dark ages; Reionization; First stars methods: data analysis. |
Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00621/73263/72475.pdf |
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