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

• Published in: The Astrophysical Journal
• Main Authors: Wu, W.L.K., Mocanu, L.M., Ade, P.A.R., Anderson, A.J., Austermann, J.E., Avva, J.S., Beall, J.A., Bender, A.N., Benson, B.A., Bianchini, F., Bleem, L.E., Carlstrom, J.E., Chang, C.L., Chiang, H.C., Citron, R., Corbett Moran, C., Crawford, T.M., Crites, A.T., de Haan, T., Dobbs, M.A., Everett, W., Gallicchio, J., George, E.M., Gilbert, A., Gupta, N., Halverson, N.W., Harrington, N., Henning, J.W., Hilton, G.C., Holder, G.P., Holzapfel, W.L., Hou, Z., Hrubes, J.D., Huang, N., Hubmayr, J., Irwin, K.D., Knox, L., Lee, A.T., Li, D., Lowitz, A., Manzotti, A., Mcmahon, J.J., Meyer, S.S., Millea, M., Montgomery, J., Nadolski, A., Natoli, T., Nibarger, J.P., Noble, G.I., Novosad, V.
• Other Authors: Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2019
• Subjects: cosmic background radiation: temperature; gravitation: lens; cosmic background radiation: polarization; power spectrum; multipole; cosmological model; statistical analysis; data analysis method; numerical calculations; satellite: Planck; [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]; Lambda; South Pole; South pole
• Online Access: https://hal.science/hal-02148059; https://doi.org/10.3847/1538-4357/ab4186

International audience 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 $\textit{Planck}$ 2015 TT+lowP+lensing dataset. For the minimum-variance estimator, we find $A_{\rm{MV}} = 0.944 \pm 0.058{\rm (Stat.)}\pm0.025{\rm (Sys.)}$; restricting to only polarization data, we find $A_{\rm{POL}} = 0.906 \pm 0.090 {\rm (Stat.)} \pm 0.040 {\rm (Sys.)}$. 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.