The Atacama Cosmology Telescope: Cosmology from Cross-correlations of unWISE Galaxies and ACT DR6 CMB Lensing

Gerrit S. Farren, Alex Krolewski, Niall MacCrann, Simone Ferraro, Irene Abril-Cabezas, Rui An, Zachary Atkins, Nicholas Battaglia, J. Richard Bond, Erminia Calabrese, Steve K. Choi, Omar Darwish, Mark J. Devlin, Adriaan J. Duivenvoorden, Jo Dunkley, J. Colin Hill, Matt Hilton, Kevin M. Huffenberger, Joshua Kim, Thibaut LouisMathew S. Madhavacheril, Gabriela A. Marques, Jeff McMahon, Kavilan Moodley, Lyman A. Page, Bruce Partridge, Frank J. Qu, Emmanuel Schaan, Neelima Sehgal, Blake D. Sherwin, Cristóbal Sifón, Suzanne T. Staggs, Alexander Van Engelen, Cristian Vargas, Lukas Wenzl, Martin White, Edward J. Wollack

Research output: Contribution to journalArticlepeer-review


We present tomographic measurements of structure growth using cross-correlations of Atacama Cosmology Telescope (ACT) DR6 and Planck cosmic microwave background (CMB) lensing maps with the unWISE Blue and Green galaxy samples, which span the redshift ranges 0.2 ≲ z ≲ 1.1 and 0.3 ≲ z ≲ 1.8, respectively. We improve on prior unWISE cross-correlations not just by making use of the new, high-precision ACT DR6 lensing maps, but also by including additional spectroscopic data for redshift calibration and by analyzing our measurements with a more flexible theoretical model. We determine the amplitude of matter fluctuations at low redshifts (z ≃ 0.2-1.6), finding S 8 ≡ σ 8 ( Ω m / 0.3 ) 0.5 = 0.813 ± 0.021 using the ACT cross-correlation alone and S 8 = 0.810 ± 0.015 with a combination of Planck and ACT cross-correlations; these measurements are fully consistent with the predictions from primary CMB measurements assuming standard structure growth. The addition of baryon acoustic oscillation data breaks the degeneracy between σ 8 and Ωm , allowing us to measure σ 8 = 0.813 ± 0.020 from the cross-correlation of unWISE with ACT and σ 8 = 0.813 ± 0.015 from the combination of cross-correlations with ACT and Planck. These results also agree with the expectations from primary CMB extrapolations in ΛCDM cosmology; the consistency of σ 8 derived from our two redshift samples at z ∼ 0.6 and 1.1 provides a further check of our cosmological model. Our results suggest that structure formation on linear scales is well described by ΛCDM even down to low redshifts z ≲ 1.

Original languageEnglish (US)
Article number157
JournalAstrophysical Journal
Issue number2
StatePublished - May 1 2024

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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