Papers › The Atacama Cosmology Telescope: Multi-probe cosmology with unWISE galaxies and ACT...
The Atacama Cosmology Telescope: Multi-probe cosmology with unWISE galaxies and ACT DR6 CMB lensing
Gerrit S. Farren, Alex Krolewski, Frank J. Qu, Simone Ferraro, Erminia Calabrese, Jo Dunkley, Carmen Embil Villagra, J. Colin Hill, Joshua Kim, Mathew S. Madhavacheril, Kavilan Moodley, Lyman A. Page, Bruce Partridge, Neelima Sehgal, Blake D. Sherwin, Cristóbal Sifón, Suzanne T. Staggs, Alexander Van Engelen, Edward J. Wollack
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We present a joint analysis of the CMB lensing power spectra measured from the Data Release 6 of the Atacama Cosmology Telescope and Planck PR4, cross-correlations between the ACT and Planck lensing reconstruction and galaxy clustering from unWISE, and the unWISE clustering auto-spectrum. We obtain 1.5% constraints on the matter density fluctuations at late times parametrised by the best constrained parameter combination S₈³ˣ²ᵖᵗ≡σ₈ (Ωₘ/0.3)^(0.4)=0.815±0.012. The commonly used S₈≡σ₈ (Ωₘ/0.3)^(0.5) parameter is constrained to S₈=0.816±0.015. In combination with baryon acoustic oscillation (BAO) measurements we find σ₈=0.815±0.012. We also present sound-horizon-independent estimates of the present day Hubble rate of H₀=66.4^(+3.2)_(-3.7) km s⁻¹Mpc⁻¹ from our large scale structure data alone and H₀=64.3^(+2.1)_(-2.4) km s⁻¹Mpc⁻¹ in combination with uncalibrated supernovae from Pantheon+. Using parametric estimates of the evolution of matter density fluctuations, we place constraints on cosmic structure in a range of high redshifts typically inaccessible with cross-correlation analyses. Combining lensing cross- and auto-correlations, we derive a 3.3% constraint on the integrated matter density fluctuations above z=2.4, one of the tightest constraints in this redshift range and fully consistent with a ΛCDM model fit to the primary CMB from Planck. Combining with primary CMB observations and using the extended low redshift coverage of these combined data sets we derive constraints on a variety of extensions to the ΛCDM model including massive neutrinos, spatial curvature, and dark energy. We find in flat ΛCDM ∑m_ν<0.12 eV at 95% confidence using the LSS data, BAO measurements from SDSS and primary CMB observations.
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