2021/01/05 by D. Dutcher, L. Balkenhol, P. A. R. Ade +118 · 2 citations
Physics and Astronomy · #astro-ph.CO
paper · pdf · doi:10.1103/physrevd.104.022003
published as Phys. Rev. D 104, 022003 (2021)
arxiv created 2021/01/05 · arxiv updated 2021/07/21
We present measurements of the E-mode (EE) polarization power spectrum and temperature-E-mode (TE) cross-power spectrum of the cosmic microwave background using data collected by SPT-3G, the latest instrument installed on the South Pole Telescope. This analysis uses observations of a 1500 deg2 region at 95, 150, and 220 GHz taken over a four month period in 2018. We report binned values of the EE and TE power spectra over the angular multipole range 300 ≤ ℓ < 3000, using the multifrequency data to construct six semi-independent estimates of each power spectrum and their minimum-variance combination. These measurements improve upon the previous results of SPTpol across the multipole ranges 300 ≤ ℓ ≤ 1400 for EE and 300 ≤ ℓ ≤ 1700 for TE, resulting in constraints on cosmological parameters comparable to those from other current leading ground-based experiments. We find that the SPT-3G dataset is well-fit by a ΛCDM cosmological model with parameter constraints consistent with those from Planck and SPTpol data. From SPT-3G data alone, we find H0 = 68.8 ± 1.5 \mathrmkm s-1 Mpc-1 and σ8 = 0.789 ± 0.016, with a gravitational lensing amplitude consistent with the ΛCDM prediction (AL = 0.98 ± 0.12). We combine the SPT-3G and the Planck datasets and obtain joint constraints on the ΛCDM model. The volume of the 68% confidence region in six-dimensional ΛCDM parameter space is reduced by a factor of 1.5 compared to Planck-only constraints, with only slight shifts in central values. We note that the results presented here are obtained from data collected during just half of a typical observing season with only part of the focal plane operable, and that the active detector count has since nearly doubled for observations made with SPT-3G after 2018.