Ade, PAR;
Aghanim, N;
Ashdown, M;
Aumont, J;
Baccigalupi, C;
Banday, AJ;
Barreiro, RB;
... Zonca, A; + view all
(2016)
Planck intermediate results XLI. A map of lensing-induced B-modes.
Astronomy & Astrophysics
, 596
(ARTN A10)
10.1051/0004-6361/201527932.
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Abstract
The secondary cosmic microwave background (CMB) B-modes stem from the post-decoupling distortion of the polarization E-modes due to the gravitational lensing effect of large-scale structures. These lensing-induced B-modes constitute both a valuable probe of the dark matter distribution and an important contaminant for the extraction of the primary CMB B-modes from inflation. Planck provides accurate nearly all-sky measurements of both the polarization E-modes and the integrated mass distribution via the reconstruction of the CMB lensing potential. By combining these two data products, we have produced an all-sky template map of the lensing-induced B-modes using a real-space algorithm that minimizes the impact of sky masks. The cross-correlation of this template with an observed (primordial and secondary) B-mode map can be used to measure the lensing B-mode power spectrum at multipoles up to 2000. In particular, when cross-correlating with the B-mode contribution directly derived from the Planck polarization maps, we obtain lensing-induced B-mode power spectrum measurement at a significance level of 12σ, which agrees with the theoretical expectation derived from the Planck best-fit Λ cold dark matter model. This unique nearly all-sky secondary B-mode template, which includes the lensing-induced information from intermediate to small (10 ≲ ℓ ≲ 1000) angular scales, is delivered as part of the Planck 2015 public data release. It will be particularly useful for experiments searching for primordial B-modes, such as BICEP2/Keck Array or LiteBIRD, since it will enable an estimate to be made of the lensing-induced contribution to the measured total CMB B-modes.
| Type: | Article |
|---|---|
| Title: | Planck intermediate results XLI. A map of lensing-induced B-modes |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/201527932 |
| Publisher version: | http://dx.doi.org/10.1051/0004-6361/201527932 |
| Additional information: | © ESO, 2016 |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, cosmology: observations, cosmic background radiation, polarization, gravitational lensing: weak, MICROWAVE BACKGROUND POLARIZATION, INFLATIONARY UNIVERSE SCENARIO, GRAVITY-WAVES, CMB, RECONSTRUCTION, COSMOLOGY, PROSPECTS, FLATNESS, HORIZON, SPHERE |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1540954 |
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