The Atacama Cosmology Telescope: a measurement of the Cosmic Microwave Background power spectra at 98 and 150 GHz

By Steve K. Choi, M. Hasselfield, S. Ho, B. Koopman, M. Lungu, M. Abitbol, G. Addison, P. Ade, S. Aiola, D. Alonso and 129 more. Journal of Cosmology and Astroparticle Physics, 2020

267 citations recorded by the source corpus.

We present the temperature and polarization angular power spectra of the CMB measured by the Atacama Cosmology Telescope (ACT) from 5400 deg2 of the 2013–2016 survey, which covers >15000 deg2 at 98 and 150 GHz. For this analysis we adopt a blinding strategy to help avoid confirmation bias and, related to this, show numerous checks for systematic error done before unblinding. Using the likelihood for the cosmological analysis we constrain secondary sources of anisotropy and foreground emission, and derive a “CMB-only” spectrum that extends to ℓ=4000. At large angular scales, foreground emission at 150 GHz is ∼1% of TT and EE within our selected regions and consistent with that found by Planck. Using the same likelihood, we obtain the cosmological parameters for ΛCDM for the ACT data alone with a prior on the optical depth of τ=0.065±0.015. ΛCDM is a good fit. The best-fit model has a reduced χ2 of 1.07 (PTE=0.07) with H0=67.9±1.5 km/s/Mpc. We show that the lensing BB signal is consistent with ΛCDM and limit the celestial EB polarization angle to ψP =−0.07̂±0.09̂. We directly cross correlate ACT with Planck and observe generally good agreement but with some discrepancies in TE. All data on which this analysis is based will be publicly released.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/2f226c0b49b6e198bd8266064494b0052f29f97c

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Citations in the corpus

• The Atacama Cosmology Telescope: DR6 Gravitational Lensing Map and Cosmological Parameters (2023, methodology): “An independent measurement from ACT DR4+WMAP (Aiola et al. 2020; Choi et al. 2020) is consistent with zero spatial curvature.”
• Measurements of the E -mode polarization and temperature- E -mode correlation of the CMB from SPT-3G 2018 data (2021, methodology): “[2] T. Louis, E. Grace, M. Hasselfield et al., The atacama cosmology telescope: Two-season ACTPol spectra and parameters, J. Cosmol.”
• The Atacama Cosmology Telescope: A Measurement of the DR6 CMB Lensing Power Spectrum and Its Implications for Structure Growth (2023, methodology): “We mask Fourier modes with |`x| < 90 and |`y| < 50 to remove this contamination as in Louis et al. (2017); Choi et al. (2020).”
• Cosmological parameters derived from the final Planck data release (PR4) (2023, background): “66) µ K 2 (Choi et al. 2020).”