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CERN Document Server Encontrados 2,036 registros  1 - 10siguientefinal  ir al registro: La búsqueda tardó 2.42 segundos. 
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Planck 2015 results. XVII. Constraints on primordial non-Gaussianity / Planck Collaboration
The Planck full mission cosmic microwave background(CMB) temperature and E-mode polarization maps are analysed to obtain constraints on primordial non-Gaussianity(NG). Using three classes of optimal bispectrum estimators - separable template-fitting (KSW), binned, and modal - we obtain consistent values for the local, equilateral, and orthogonal bispectrum amplitudes, quoting as our final result from temperature alone fNL^local=2.5+\-5.7, fNL^equil=-16+\-70 and fNL^ortho=-34+\-33(68%CL) [...]
arXiv:1502.01592.- 2016-09-20 - 66 p. - Published in : Astron. Astrophys. 594 (2016) A17 Fulltext: PDF; External link: Preprint
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Planck 2015 results. XVIII. Background geometry & topology / Planck Collaboration
Full-sky CMB maps from the 2015 Planck release allow us to detect departures from global isotropy on the largest scales. We present the first searches using CMB polarization for correlations induced by a non-trivial topology with a fundamental domain intersecting, or nearly intersecting, the last scattering surface (at comoving distance $\chi_{rec}$) [...]
arXiv:1502.01593.- 2016-09-20 - 21 p. - Published in : Astron. Astrophys. 594 (2016) A18 Fulltext: PDF; External link: Preprint
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Planck 2015 results. XIX. Constraints on primordial magnetic fields / Planck Collaboration
We predict and investigate four types of imprint of a stochastic background of primordial magnetic fields (PMFs) on the cosmic microwave background (CMB) anisotropies: the impact of PMFs on the CMB spectra; the effect on CMB polarization induced by Faraday rotation; magnetically-induced non-Gaussianities; and the magnetically-induced breaking of statistical isotropy. Overall, Planck data constrain the amplitude of PMFs to less than a few nanogauss. [...]
arXiv:1502.01594.- 2016-09-20 - 27 p. - Published in : Astron. Astrophys. 594 (2016) A19 Fulltext: PDF; External link: Preprint
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Planck 2015 results. VII. HFI TOI and beam processing / Planck Collaboration
The Planck High Frequency Instrument (HFI) has observed the full sky at six frequencies (100, 143, 217, 353, 545, and 857 GHz) in intensity and at four frequencies in linear polarization (100, 143, 217, and 353 GHz). In order to obtain sky maps, the time-ordered information (TOI) containing the detector and pointing samples must be processed and the angular response must be assessed. [...]
arXiv:1502.01586.- 2016-09-20 - 30 p. - Published in : Astron. Astrophys. 594 (2016) A7 Fulltext: PDF; External link: Preprint
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Planck 2015 results. VIII. High Frequency Instrument data processing: Calibration and maps / Planck Collaboration
This paper describes the processing applied to the Planck High Frequency Instrument (HFI) cleaned, time-ordered information to produce photometrically calibrated maps in temperature and (for the first time) in polarization. The data from the 2.5 year full mission include almost five independent full-sky surveys. [...]
arXiv:1502.01587.- 2016-09-20 - 27 p. - Published in : Astron. Astrophys. 594 (2016) A8 Fulltext: PDF; External link: Preprint
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Planck 2015 results. X. Diffuse component separation: Foreground maps / Planck Collaboration
Planck has mapped the microwave sky in nine frequency bands between 30 and 857 GHz in temperature and seven bands between 30 and 353 GHz in polarization. In this paper we consider the problem of diffuse astrophysical component separation, and process these maps within a Bayesian framework to derive a consistent set of full-sky astrophysical component maps. [...]
arXiv:1502.01588.- 2016-09-20 - 63 p. - Published in : Astron. Astrophys. 594 (2016) A10 Fulltext: PDF; External link: Preprint
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Planck 2015 results. I. Overview of products and scientific results / Planck Collaboration
The European Space Agency's Planck satellite, dedicated to studying the early Universe and its subsequent evolution, was launched 14~May 2009 and scanned the microwave and submillimetre sky continuously between 12~August 2009 and 23~October 2013. In February~2015, ESA and the Planck Collaboration released the second set of cosmology products based on data from the entire Planck mission, including both temperature and polarization, along with a set of scientific and technical papers and a web-based explanatory supplement. [...]
arXiv:1502.01582.- 2016-09-20 - 38 p. - Published in : Astron. Astrophys. 594 (2016) A1 Fulltext: PDF; External link: Preprint
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Planck 2015 results. XXI. The integrated Sachs-Wolfe effect / Planck Collaboration
This paper presents a study of the ISW effect from the Planck 2015 temperature and polarization data release. The CMB is cross-correlated with different LSS tracers: the NVSS, SDSS and WISE catalogues, and the Planck 2015 convergence lensing map. [...]
arXiv:1502.01595.- 2016-09-20 - 30 p. - Published in : Astron. Astrophys. 594 (2016) A21 Fulltext: PDF; External link: Preprint
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Planck 2015 results. XV. Gravitational lensing / Planck Collaboration
We present the most significant measurement of the cosmic microwave background (CMB) lensing potential to date (at a level of 40 sigma), using temperature and polarization data from the Planck 2015 full-mission release. Using a polarization-only estimator we detect lensing at a significance of 5 sigma. [...]
arXiv:1502.01591.- 2016-09-20 - 28 p. - Published in : Astron. Astrophys. 594 (2016) A15 Fulltext: PDF; External link: Preprint
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Planck 2015 results. XXII. A map of the thermal Sunyaev-Zeldovich effect / Planck Collaboration
We have constructed all-sky y-maps of the thermal Sunyaev-Zeldovich (tSZ) effect by applying specifically tailored component separation algorithms to the 30 to 857 GHz frequency channel maps from the Planck satellite survey. These reconstructed y-maps are delivered as part of the Planck 2015 release. [...]
arXiv:1502.01596.- 2016-09-20 - 24 p. - Published in : Astron. Astrophys. 594 (2016) A22 Fulltext: PDF; External link: Preprint
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