Measurements of the E mode polarization and temperatureE mode correlation of the CMB from SPT3G 2018 data
Abstract
We present measurements of the E mode (E E ) polarization power spectrum and temperatureE mode (T E ) crosspower spectrum of the cosmic microwave background using data collected by SPT3G, the latest instrument installed on the South Pole Telescope. This analysis uses observations of a 1500 deg^{2} region at 95, 150, and 220 GHz taken over a fourmonth period in 2018. We report binned values of the E E and T E power spectra over the angular multipole range 300 ≤ℓ<3000 , using the multifrequency data to construct six semiindependent estimates of each power spectrum and their minimumvariance combination. These measurements improve upon the previous results of SPTpol across the multipole ranges 300 ≤ℓ≤1400 for E E and 300 ≤ℓ≤1700 for T E , resulting in constraints on cosmological parameters comparable to those from other current leading groundbased experiments. We find that the SPT3G data set is well fit by a Λ CDM cosmological model with parameter constraints consistent with those from Planck and SPTpol data. From SPT3G data alone, we find H_{0}=68.8 ±1.5 km s^{−1} Mpc^{−1} and σ_{8}=0.789 ±0.016 , with a gravitational lensing amplitude consistent with the Λ CDM prediction (A_{L}=0.98 ±0.12 ). We combine the SPT3G and the Planck data sets and obtain joint constraints on the Λ CDM model. The volume of the 68% confidence region in sixdimensional Λ CDM parameter space is reduced by a factor of 1.5 compared to Planckonly constraints, with no significant 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 SPT3G after 2018.
 Publication:

Physical Review D
 Pub Date:
 July 2021
 DOI:
 10.1103/PhysRevD.104.022003
 arXiv:
 arXiv:2101.01684
 Bibcode:
 2021PhRvD.104b2003D
 Keywords:

 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 Phys. Rev. D 104, 022003 (2021)