A Measurement of the Cosmic Microwave Background Lensing Potential and Power Spectrum from 500 deg${}^2$ of SPTpol Temperature and Polarization Data

Abstract

We present a measurement of the cosmic microwave background (CMB) lensing potential using 500 deg${}^2$ 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 $L\lesssim 250$, using a quadratic estimator on a combination of CMB 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, polarization-only, and minimum-variance estimators. We measure the lensing amplitude by taking the ratio of the measured spectrum to the expected spectrum from the best-fit $\Lambda$CDM model to the $\text{Planck}$ 2015 TT+lowP+lensing dataset. For the minimum-variance estimator, we find $A_{\mathrm{MV}}=0.944\pm 0.058(Stat.)\pm 0.025(Sys.)$; restricting to only polarization data, we find $A_{\mathrm{POL}}=0.906\pm 0.090(Stat.)\pm 0.040(Sys.)$. Considering statistical uncertainties alone, this is the most precise polarization-only lensing amplitude constraint to date (10.1 $\sigma$), and is more precise than our temperature-only constraint. We perform null tests and consistency checks and find no evidence for significant contamination.

arXiv comment18 pages, 8 figures; updated to match published version

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