Dark Energy Survey Year 1 Results: Cross-correlation between DES Y1 galaxy weak lensing and SPT+Planck CMB weak lensing

• Published in: arXiv.org 2018-10
• Main Authors: Baxter, E, Chang, C, Kirk, D, Bernstein, G M, Bleem, L E, Cawthon, R, Choi, A, Chown, R, Crawford, T M, Davis, C, De Vicente, J, DeRose, J, Fosalba, P, Friedrich, O, Gatti, M, Gaztanaga, E, Giannantonio, T, Gruen, D, Hartley, W G, Holder, G P, Jain, B, Jarvis, M, Krause, E, MacCrann, N, Miquel, R, Prat, J, Rau, M M, Reichardt, C L, Rozo, E, Samuroff, S, Sánchez, C, Secco, L F, Sheldon, E, Wechsler, R H, Zuntz, J, Abdalla, F B, Allam, S, Avila, S, Aylor, K, Benson, B A, Bertin, E, Bridle, S L, Brooks, D, Burke, D L, M Carrasco Kind, Carretero, J, Castander, F J, Crocce, M, Cunha, C E, da Costa, L N, de Haan, T, Diehl, H T, Dietrich, J P, Dobbs, M A, Fernandez, E, Flaugher, B, Frieman, J, George, E M, Gutierrez, G, Harrington, N L, Hollowood, D L, Honscheid, K, Holzapfel, W L, Hou, Z, Hrubes, J D, Kuehn, K, Lima, M, Leitch, E M, Luong-Van, D, Manzotti, A, Marrone, D P, Marshall, J L, Martini, P, McMahon, J J, Melchior, P, Menanteau, F, Mocanu, L M, Natoli, T, Ogando, R L C, Plazas, A A, Pryke, C, Romer, A K, Roodman, A, Rykoff, E S, Sanchez, E, Scarpine, V, Schindler, R, Sevilla-Noarbe, I, Shirokoff, E, Soares-Santos, M, Sobreira, F, Suchyta, E, Swanson, M E C, Tarle, G, Vanderlinde, K, Vikram, V, Walker, A R, Williamson, R, Wu, W L K, Collaborations, SPT
• Format: Article
• Language: English
• Subjects: Constraint modelling; Correlation analysis; Cosmic microwave background; Dark energy; Galaxies; Noise measurement; Red shift; Sky surveys (astronomy); South Pole
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1810.02441

We cross-correlate galaxy weak lensing measurements from the Dark Energy Survey (DES) year-one (Y1) data with a cosmic microwave background (CMB) weak lensing map derived from South Pole Telescope (SPT) and Planck data, with an effective overlapping area of 1289 deg\(^{2}\). With the combined measurements from four source galaxy redshift bins, we reject the hypothesis of no lensing with a significance of \(10.8\sigma\). When employing angular scale cuts, this significance is reduced to \(6.8\sigma\), which remains the highest signal-to-noise measurement of its kind to date. We fit the amplitude of the correlation functions while fixing the cosmological parameters to a fiducial \(\Lambda\)CDM model, finding \(A = 0.99 \pm 0.17\). We additionally use the correlation function measurements to constrain shear calibration bias, obtaining constraints that are consistent with previous DES analyses. Finally, when performing a cosmological analysis under the \(\Lambda\)CDM model, we obtain the marginalized constraints of \(\Omega_{\rm m}=0.261^{+0.070}_{-0.051}\) and \(S_{8}\equiv \sigma_{8}\sqrt{\Omega_{\rm m}/0.3} = 0.660^{+0.085}_{-0.100}\). These measurements are used in a companion work that presents cosmological constraints from the joint analysis of two-point functions among galaxies, galaxy shears, and CMB lensing using DES, SPT and Planck data.