Dark Energy Survey Year 1 Results: Tomographic cross-correlations between Dark Energy Survey galaxies and CMB lensing from South Pole Telescope +Planck

Journal Article · Thu Aug 01 00:00:00 EDT 2019 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.100.043501· OSTI ID:1574981

Omori, Y.; Giannantonio, T.; Porredon, A.; Baxter, E. J.; Chang, C.; Crocce, M.; Fosalba, P.; Alarcon, A.; Banik, N.; Blazek, J.; Bleem, L. E.; Carlstrom, J. E.; Chang, C. L.

We measure the cross-correlation between redMaGiC galaxies selected from the Dark Energy Survey (DES) year 1 data and gravitational lensing of the cosmic microwave background (CMB) reconstructed from South Pole Telescope (SPT) and Planck data over 1289 deg2 . When combining measurements across multiple galaxy redshift bins spanning the redshift range of 0.15 <0.90 , we reject the hypothesis of no correlation at 19.9 σ significance. When removing small-scale data points where thermal Sunyaev-Zel'dovich signal and nonlinear galaxy bias could potentially bias our results, the detection significance is reduced to 9.9 σ . We perform a joint analysis of galaxy-CMB lensing cross-correlations and galaxy clustering to constrain cosmology, finding Ωm=0.27 6-0.030+0.029 and S8=σ8√{Ωm/0.3 }=0.80 0-0.094+0.090 . We also perform two alternate analyses aimed at constraining only the growth rate of cosmic structure as a function of redshift, finding consistency with predictions from the concordance Λ CDM model. The measurements presented here are part of a joint cosmological analysis that combines galaxy clustering, galaxy lensing and CMB lensing using data from DES, SPT and Planck.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science - Office of High Energy Physics; Natural Sciences and Engineering Research Council of Canada (NSERC); National Science Foundation (NSF); Australian Research Council
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1574981
• Journal Information: Physical Review D, Vol. 100, Issue 4
• Country of Publication: United States
• Language: English