We present a measurement of the cosmic microwave background lensing potential using 500 deg2 of 150 GHz data from the SPTpol receiver on the South Pole Telescope. The lensing potential is reconstructed with signal-to-noise per mode greater than unity at lensing multipoles L ≲ 250, using a quadratic estimator on a combination of cosmic microwave background temperature and polarization maps. We report measurements of the lensing potential power spectrum in the multipole range of 100 < L < 2000 from sets of temperature-only (T), polarization-only (POL), and minimum-variance (MV) estimators. We measure the lensing amplitude by taking the ratio of the measured spectrum to the expected spectrum from the best-fit Λ cold dark matter model to the Planck 2015 TT + low P + lensing data set. For the minimum-variance estimator, we find =0.944 0.025 (Sys.) SRC=restricting to only polarization data, we find POL=0.906\pm 0.090 0.040. Considering statistical uncertainties alone, this is the most precise polarization-only lensing amplitude constraint to date (10.1σ) and is more precise than our temperature-only constraint. We perform null tests and consistency checks and find no evidence for significant contamination.
Bibliographical noteFunding Information:
2019-10-10 2019-10-14 13:11:00 cgi/release: Article released bin/incoming: New from .zip NSF PLR-1248097 NSF-PFC PHY- 0114422 Gordan and Betty Moore Foundation GBMF#947 NSF PHY-1125897 NSF AST-1402161 Australian Research Council Future Fellowship FT150100074 Fermi Research Alliance De-AC02-07CH11359 NSF AST-0956135 NSF AST-1716965 NSF CSSI-1835865 yes
- cosmology: cosmic background radiation
- large-scale structure of the universe