Dark Energy Survey Year 1 Results: Cross-correlation between Dark Energy Survey Y1 galaxy weak lensing and South Pole Telescope+ Planck CMB weak lensing

• Published in: Physical Review D
• Main Authors: Omori, Y., Baxter, E. J., Chang, C., Kirk, D., Alarcon, A., Bernstein, G. M., Bleem, L. E., Cawthon, R., Choi, A, Chown, R., Chang, C. L., Carlstrom, J. E., Vikram, V.
• Language: unknown
• Published: 2022
• Subjects: South Pole; South pole
• Online Access: http://www.osti.gov/servlets/purl/1574366; https://www.osti.gov/biblio/1574366; https://doi.org/10.1103/PhysRevD.100.043517

We cross-correlate galaxy weak lensing measurements from the Dark Energy Survey (DES) year-one 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 deg2 . With the combined measurements from four source galaxy redshift bins, we obtain a detection significance of 5.8 σ . We fit the amplitude of the correlation functions while fixing the cosmological parameters to a fiducial Λ CDM model, finding A =0.99 ±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 Λ CDM model, we obtain the marginalized constraints of Ωm=0.26 1-0.051+0.070 and S8≡σ8√{Ωm/0.3 }=0.66 0-0.100+0.085. 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.