Dark energy survey year 1 results: Cross-correlation between des y1 galaxy weak lensing and spt+planck cmb weak lensing

DES & SPT Collaborations

Research output: Contribution to journalArticlepeer-review

Abstract

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 deg2. With the combined measurements from four source galaxy redshift bins, we reject the hypothesis of no lensing with a significance of 10.8σ. When employing angular scale cuts, this significance is reduced to 6.8σ, 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 ΛCDM 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 ΛCDM model, we obtain the marginalized constraints of Ωm = 0.261+00..070051 and S8 ≡ σ8pΩm/0.3 = 0.660+00..085100. 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.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Oct 4 2018

ASJC Scopus subject areas

  • General

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