The Atacama Cosmology Telescope: Cosmology from cross-correlations of unWISE galaxies and ACT DR6 CMB lensing
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2023
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| author | Farren, Gerrit S. Krolewski, Alex MacCrann, Niall Ferraro, Simone Abril-Cabezas, Irene An, Rui Atkins, Zachary Battaglia, Nicholas Bond, J. Richard Calabrese, Erminia Choi, Steve K. Darwish, Omar Devlin, Mark J. Duivenvoorden, Adriaan J. Dunkley, Jo Hill, J. Colin Hilton, Matt Huffenberger, Kevin M. Kim, Joshua Louis, Thibaut Madhavacheril, Mathew S. Marques, Gabriela A. Moodley, Kavilan Page, Lyman A. Partridge, Bruce Qu, Frank J. Schaan, Emmanuel Sehgal, Neelima Sherwin, Blake D. Sifón, Cristóbal Staggs, Suzanne T. Van Engelen, Alexander Vargas, Cristian Wenzl, Lukas White, Martin Wollack, Edward J. |
| author_facet | Farren, Gerrit S. Krolewski, Alex MacCrann, Niall Ferraro, Simone Abril-Cabezas, Irene An, Rui Atkins, Zachary Battaglia, Nicholas Bond, J. Richard Calabrese, Erminia Choi, Steve K. Darwish, Omar Devlin, Mark J. Duivenvoorden, Adriaan J. Dunkley, Jo Hill, J. Colin Hilton, Matt Huffenberger, Kevin M. Kim, Joshua Louis, Thibaut Madhavacheril, Mathew S. Marques, Gabriela A. Moodley, Kavilan Page, Lyman A. Partridge, Bruce Qu, Frank J. Schaan, Emmanuel Sehgal, Neelima Sherwin, Blake D. Sifón, Cristóbal Staggs, Suzanne T. Van Engelen, Alexander Vargas, Cristian Wenzl, Lukas White, Martin Wollack, Edward J. |
| contents | We present tomographic measurements of structure growth using cross-correlations of Atacama Cosmology Telescope (ACT) DR6 and Planck CMB lensing maps with the unWISE Blue and Green galaxy samples, which span the redshift ranges $0.2 \lesssim z \lesssim 1.1$ and $0.3 \lesssim z \lesssim 1.8$, 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 analysing our measurements with a more flexible theoretical model. An extensive suite of systematic and null tests within a blind analysis framework ensures that our results are robust. We determine the amplitude of matter fluctuations at low redshifts ($z\simeq 0.2-1.6$), finding $S_8 \equiv σ_8 (Ω_m / 0.3)^{0.5} = 0.813 \pm 0.021$ using the ACT cross-correlation alone and $S_8 = 0.810 \pm 0.015$ 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 $Ω_m$, allowing us to measure $σ_8 = 0.813 \pm 0.020$ from the cross-correlation of unWISE with ACT and $σ_8 = 0.813\pm 0.015$ from the combination of cross-correlations with ACT and Planck. These results also agree with the expectations from primary CMB extrapolations in $Λ$CDM cosmology; the consistency of $σ_8$ derived from our two redshift samples at $z \sim 0.6$ and $1.1$ provides a further check of our cosmological model. Our results suggest that structure formation on linear scales is well described by $Λ$CDM even down to low redshifts $z\lesssim 1$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_05659 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | The Atacama Cosmology Telescope: Cosmology from cross-correlations of unWISE galaxies and ACT DR6 CMB lensing Farren, Gerrit S. Krolewski, Alex MacCrann, Niall Ferraro, Simone Abril-Cabezas, Irene An, Rui Atkins, Zachary Battaglia, Nicholas Bond, J. Richard Calabrese, Erminia Choi, Steve K. Darwish, Omar Devlin, Mark J. Duivenvoorden, Adriaan J. Dunkley, Jo Hill, J. Colin Hilton, Matt Huffenberger, Kevin M. Kim, Joshua Louis, Thibaut Madhavacheril, Mathew S. Marques, Gabriela A. Moodley, Kavilan Page, Lyman A. Partridge, Bruce Qu, Frank J. Schaan, Emmanuel Sehgal, Neelima Sherwin, Blake D. Sifón, Cristóbal Staggs, Suzanne T. Van Engelen, Alexander Vargas, Cristian Wenzl, Lukas White, Martin Wollack, Edward J. Cosmology and Nongalactic Astrophysics We present tomographic measurements of structure growth using cross-correlations of Atacama Cosmology Telescope (ACT) DR6 and Planck CMB lensing maps with the unWISE Blue and Green galaxy samples, which span the redshift ranges $0.2 \lesssim z \lesssim 1.1$ and $0.3 \lesssim z \lesssim 1.8$, 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 analysing our measurements with a more flexible theoretical model. An extensive suite of systematic and null tests within a blind analysis framework ensures that our results are robust. We determine the amplitude of matter fluctuations at low redshifts ($z\simeq 0.2-1.6$), finding $S_8 \equiv σ_8 (Ω_m / 0.3)^{0.5} = 0.813 \pm 0.021$ using the ACT cross-correlation alone and $S_8 = 0.810 \pm 0.015$ 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 $Ω_m$, allowing us to measure $σ_8 = 0.813 \pm 0.020$ from the cross-correlation of unWISE with ACT and $σ_8 = 0.813\pm 0.015$ from the combination of cross-correlations with ACT and Planck. These results also agree with the expectations from primary CMB extrapolations in $Λ$CDM cosmology; the consistency of $σ_8$ derived from our two redshift samples at $z \sim 0.6$ and $1.1$ provides a further check of our cosmological model. Our results suggest that structure formation on linear scales is well described by $Λ$CDM even down to low redshifts $z\lesssim 1$. |
| title | The Atacama Cosmology Telescope: Cosmology from cross-correlations of unWISE galaxies and ACT DR6 CMB lensing |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2309.05659 |