# Measurements of the E-mode polarization and temperature-E-mode correlation of the CMB from SPT-3G 2018 data

Abstract : 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 data set 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 $H0=68.8±1.5 km s−1 Mpc−1$ 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 data sets 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 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 SPT-3G after 2018.
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https://hal.archives-ouvertes.fr/hal-03122245
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Submitted on : Friday, August 12, 2022 - 3:41:10 PM
Last modification on : Thursday, August 25, 2022 - 4:15:56 PM

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PhysRevD.104.022003.pdf
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### Citation

D. Dutcher, L. Balkenhol, P.A.R. Ade, Z. Ahmed, E. Anderes, et al.. Measurements of the E-mode polarization and temperature-E-mode correlation of the CMB from SPT-3G 2018 data. Phys.Rev.D, 2021, 104 (2), pp.022003. ⟨10.1103/PhysRevD.104.022003⟩. ⟨hal-03122245⟩

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