Lewis, A, Munshi, D, The Planck Collaboration, et al. and Unset (2014) Planck 2013 results. XVII. Gravitational lensing by large-scale structure. Astronomy and Astrophysics, 571. a17. ISSN 0004-6361
![]() |
PDF
- Published Version
Available under License Creative Commons Attribution-NonCommercial No Derivatives. Download (5MB) |
Abstract
On the arcminute angular scales probed by Planck, the cosmic microwave background (CMB) anisotropies are gently perturbed by gravitational lensing. Here we present a detailed study of this e_ect, detecting lensing independently in the 100, 143, and 217 GHz frequency bands with an overall significance of greater than 25_.We use the temperature-gradient correlations induced by lensing to reconstruct a (noisy) map of the CMB lensing potential, which provides an integrated measure of the mass distribution back to the CMB last-scattering surface. Our lensing potential map is significantly correlated with other tracers of mass, a fact which we demonstrate using several representative tracers of large-scale structure. We estimate the power spectrum of the lensing potential, finding generally good agreement with expectations from the best-fitting _CDM model for the Planck temperature power spectrum, showing that this measurement at z = 1100 correctly predicts the properties of the lower-redshift, latertime structures which source the lensing potential. When combined with the temperature power spectrum, our measurement provides degeneracy breaking power for parameter constraints; it improves CMB-alone constraints on curvature by a factor of two and also partly breaks the degeneracy between the amplitude of the primordial perturbation power spectrum and the optical depth to reionization, allowing a measurement of the optical depth to reionization which is independent of large-scale polarization data. Discarding scale information, our measurement corresponds to a 4% constraint on the amplitude of the lensing potential power spectrum, or a 2% constraint on the root-mean-squared amplitude of matter fluctuations at z _ 2.
Item Type: | Article |
---|---|
Keywords: | gravitational lensing: weak – methods: data analysis – cosmic background radiation – large-scale structure of Universe |
Schools and Departments: | School of Mathematical and Physical Sciences > Physics and Astronomy |
Subjects: | Q Science > QB Astronomy |
Depositing User: | Richard Chambers |
Date Deposited: | 22 Oct 2015 14:01 |
Last Modified: | 02 Mar 2021 16:06 |
URI: | http://sro.sussex.ac.uk/id/eprint/57304 |
View download statistics for this item
📧 Request an updateProject Name | Sussex Project Number | Funder | Funder Ref |
---|---|---|---|
Unset | Unset | STFC | Unset |