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

W.L.K. Wu , L.M. Mocanu , P.A.R. Ade , A.J. Anderson , J.E. Austermann , J.S. Avva , J.A. Beall , A.N. Bender , B.A. Benson , F. Bianchini , L.E. Bleem , J.E. Carlstrom , C.L. Chang , H.C. Chiang , R. Citron , C. Corbett Moran , T.M. Crawford , A.T. Crites , T. de Haan , M.A. Dobbs , W. Everett , J. Gallicchio , E.M. George , A. Gilbert , N. Gupta , N.W. Halverson , N. Harrington , J.W. Henning , G.C. Hilton , G.P. Holder , W.L. Holzapfel , Z. Hou , J.D. Hrubes , N. Huang , J. Hubmayr , K.D. Irwin , L. Knox , A.T. Lee , D. Li , A. Lowitz , A. Manzotti (1) , J.J. Mcmahon , S.S. Meyer , M. Millea , J. Montgomery , A. Nadolski , T. Natoli , J.P. Nibarger , G.I. Noble , V. Novosad , Y. Omori , S. Padin , S. Patil , C. Pryke , C.L. Reichardt , J.E. Ruhl , B.R. Saliwanchik , J.T. Sayre , K.K. Schaffer , C. Sievers , G. Simard , G. Smecher , A.A. Stark , K.T. Story , C. Tucker , K. Vanderlinde , T. Veach , J.D. Vieira , Gang Wang , N. Whitehorn , V. Yefremenko

1 IAP - Institut d'Astrophysique de Paris

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.

Mots clés: cosmic background radiation: temperature; gravitation: lens; cosmic background radiation: polarization; power spectrum; multipole; cosmological model; statistical analysis; data analysis method; numerical calculations; satellite: Planck

Domaines: Astrophysique [astro-ph]

W.L.K. Wu, L.M. Mocanu, P.A.R. Ade, A.J. Anderson, J.E. Austermann, et al.. A Measurement of the Cosmic Microwave Background Lensing Potential and Power Spectrum from 500 deg$^2$ of SPTpol Temperature and Polarization Data. Astrophys.J., 2019, 884, pp.70. ⟨10.3847/1538-4357/ab4186⟩. ⟨hal-02148059⟩