A 2500 deg² CMB Lensing Map from Combined South Pole Telescope and Planck Data

Abstract

We present a cosmic microwave background (CMB) lensing map produced from a linear combination of South Pole Telescope (SPT) and Planck temperature data. The 150 GHz temperature data from the 2500 deg 2 SPT-SZ survey is combined with the Planck 143 GHz data in harmonic space to obtain a temperature map that has a broader ℓ coverage and less noise than either individual map. Using a quadratic estimator technique on this combined temperature map, we produce a map of the gravitational lensing potential projected along the line of sight. We measure the auto-spectrum of the lensing potential ff C L , and compare it to the theoretical prediction for a ΛCDM cosmology consistent with the Planck 2015 data set, finding a best-fit amplitude of . The null hypothesis of no lensing is rejected at a significance of 24σ. One important use of such a lensing potential map is in cross-correlations with other dark matter tracers. We demonstrate this cross-correlation in practice by calculating the cross-spectrum, between the SPT+Planck lensing map andWide-field Infrared Survey Explorer (WISE) galaxies. We fitwith a, L 0 , and b fixed, and find h = =0.04 , which is marginally lower, but in good agreement with h = f -+ 1.000.02 , the best-fit amplitude for the cross-correlation of Planck-2015 CMB lensing and WISE galaxies over ∼67% of the sky. The lensing potential map presented here will be used for cross-correlation studies with the Dark Energy Survey, whose footprint nearly completely covers the SPT 2500 deg 2 field.

Constraints on Cosmological Parameters from the 500 deg2 SPTPOL Lensing Power Spectrum

“…Conversely, when replacing the Planck primary CMB with the SPTpol TEEE band powers from Henning et al (2018), which favour A L < 1, we find m ν < 0.42 eV (fixing A L to unity). The cosmological constraints presented in this paper are also in excellent agreement with those obtained from the SPT-SZ temperature-based lensing reconstruction over 2500 deg 2 (Omori et al 2017;Simard et al 2018), of which the SPTpol footprint is a subset.…”

“…For comparison, in Fig. 2 we also show the constraints obtained by Simard et al (2018) with the CMB lensing band powers from 2500 deg 2 observed by SPT-SZ + Planck (Omori et al 2017), which are again consistent with the SPTpol ones and similar in extent.…”

Constraints on Cosmological Parameters from the Angular Power Spectrum of a Combined 2500 deg2 SPT-SZ and Planck Gravitational Lensing Map

“…This paper is a companion to Omori et al (2017), referred to as O17 hereafter. In that work, we obtained a CMB temperature map by combining 150 GHz SPT and 143 GHz Planckdata in the 2500deg 2 South Pole Telescope (SPT)-SZ survey region, and we used the resulting temperature map to produce a map of the projected gravitational lensing potential.…”

Exploring cosmic origins with CORE: Gravitational lensing of the CMB

“…Reconstructed maps of the CMB lensing deflections have been made with data from ground-based instruments (e.g., refs. [14][15][16][17][18]) and from the Planck satellite [7,19]. Due to its nearly full-sky coverage, the Planck lensing results currently have the greatest statistical power but are very far from exhausting the information available in the lensed CMB.…”

“…The convergence produces dilation of the local small-scale CMB power spectrum, while the shear produces local JCAP04(2018)018 Figure 2. Current lensing potential power spectrum measurements from Planck 2015 [7], SPTpol [15], POLARBEAR [14], ACTPol [16], BICEP2/Keck Array [17], and SPT-SZ [18].…”