Joint analysis of Dark Energy Survey Year 3 data and CMB lensing from SPT and Planck. II. Cross-correlation measurements and cosmological constraints

• Published in: Physical Review D
• Main Authors: Chang, Chihway, Crocce, Martín, Fosalba, Pablo, Tutusaus, Isaac, García-Bellido, Juan, Gaztañaga, Enrique, Serrano, Santiago, DES and SPT Collaborations
• Other Authors: National Science Foundation (US), German Research Foundation, Department of Energy (US), Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), European Commission, European Research Council, Ministerio de Educación y Ciencia (España), Generalitat de Catalunya
• Format: Article in Journal/Newspaper
• Language: English
• Published: American Physical Society 2023
• Subjects: Kavli; South Pole; South pole
• Online Access: http://hdl.handle.net/10261/336776; https://doi.org/10.1103/PhysRevD.107.023530

C. Chang et al. (DES & SPT Collaborations). Cross-correlations of galaxy positions and galaxy shears with maps of gravitational lensing of the cosmic microwave background (CMB) are sensitive to the distribution of large-scale structure in the Universe. Such cross-correlations are also expected to be immune to some of the systematic effects that complicate correlation measurements internal to galaxy surveys. We present measurements and modeling of the cross-correlations between galaxy positions and galaxy lensing measured in the first three years of data from the Dark Energy Survey with CMB lensing maps derived from a combination of data from the 2500deg2 SPT-SZ survey conducted with the South Pole Telescope and full-sky data from the Planck satellite. The CMB lensing maps used in this analysis have been constructed in a way that minimizes biases from the thermal Sunyaev Zel’dovich effect, making them well suited for cross-correlation studies. The total signal-to-noise of the cross-correlation measurements is 23.9 (25.7) when using a choice of angular scales optimized for a linear (nonlinear) galaxy bias model. We use the cross-correlation measurements to obtain constraints on cosmological parameters. For our fiducial galaxy sample, which consist of four bins of magnitude-selected galaxies, we find constraints of Ωm=0.272+0.032−0.052 and S8≡σ8√Ωm/0.3=0.736+0.032−0.028 (Ωm=0.245+0.026−0.044 and S8=0.734+0.035−0.028) when assuming linear (nonlinear) galaxy bias in our modeling. Considering only the cross-correlation of galaxy shear with CMB lensing, we find Ωm=0.270+0.043−0.061 and S8=0.740+0.034−0.029. Our constraints on S8 are consistent with recent cosmic shear measurements, but lower than the values preferred by primary CMB measurements from Planck. C. C. and Y. O. are supported by DOE grant No. DESC0021949. The South Pole Telescope program is supported by the National Science Foundation (NSF) through the grant No. OPP-1852617. Partial support is also provided by the Kavli Institute of Cosmological ...