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 $1289{\mathrm{deg}}^2$. With the combined measurements from four source galaxy redshift bins, we obtain a detection significance of $5.8\sigma$. We fit the amplitude of the correlation functions while fixing the cosmological parameters to a fiducial $\mathrm{\Lambda }\mathrm{CDM}$ 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 $\mathrm{\Lambda }\mathrm{CDM}$ model, we obtain the marginalized constraints of ${\mathrm{\Omega }}_{\mathrm{m}}=0.261_{-0.051}^{+0.070}$ and $S_8\equiv {\sigma }_8\sqrt{{\mathrm{\Omega }}_{\mathrm{m}}/0.3}=0.660_{-0.100}^{+0.085}$. 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.

• Received 2 November 2018

DOI:https://doi.org/10.1103/PhysRevD.100.043517