10-1051-0004-6361-201526926.pdf (23.63 MB)
Planck 2015 results. XI. CMB power spectra, likelihoods, and robustness of parameters
journal contribution
posted on 2023-06-09, 04:42 authored by Antony LewisAntony Lewis, Dipak MunshiDipak Munshi, The Planck CollaborationThis paper presents the Planck 2015 likelihoods, statistical descriptions of the 2-point correlations of CMB data, using the hybrid approach employed previously: pixel-based at l<30 and a Gaussian approximation to the distribution of spectra at higher l . The main improvements are the use of more and better processed data and of Planck polarization data, and more detailed foreground and instrumental models, allowing further checks and enhanced immunity to systematics. Progress in foreground modelling enables a larger sky fraction. Improvements in processing and instrumental models further reduce uncertainties. For temperature, we perform an analysis of end-to-end instrumental simulations fed into the data processing pipeline; this does not reveal biases from residual instrumental systematics. The ? CDM cosmological model continues to offer a very good fit to Planck data. The slope of primordial scalar fluctuations, n s , is confirmed smaller than unity at more than 5{\sigma} from Planck alone. We further validate robustness against specific extensions to the baseline cosmology. E.g., the effective number of neutrino species remains compatible with the canonical value of 3.046. This first detailed analysis of Planck polarization concentrates on E modes. At low l we use temperature at all frequencies and a subset of polarization. The frequency range improves CMB-foreground separation. Within the baseline model this requires a reionization optical depth t=0.078±0.019 , significantly lower than without high-frequency data for explicit dust monitoring. At high l we detect residual errors in E, typically O(µ K 2 ); we recommend temperature alone as the high-l baseline. Nevertheless, Planck high-l polarization allows a separate determination of ? CDM parameters consistent with those from temperature alone.
Funding
Precision cosmological parameters : CosmoPars; G1365; EUROPEAN UNION; 616170 ERC-2013-CoG
Astrophysics and Cosmology - Sussex Consolidated Grant; G1291; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/L000652/1
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Astronomy and AstrophysicsISSN
0004-6361Publisher
EDP SciencesExternal DOI
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a11Volume
594Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Astronomy Centre Publications
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- Yes
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- Yes
Legacy Posted Date
2017-01-12First Open Access (FOA) Date
2017-01-12First Compliant Deposit (FCD) Date
2017-01-12Usage metrics
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