The Astrophysical Journal (Jan 2024)
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 Louis,
- Mathew 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
Affiliations
- Gerrit S. Farren
- ORCiD
- DAMTP, Centre for Mathematical Sciences, University of Cambridge , Wilberforce Road, Cambridge CB3 OWA, UK ; [email protected]; Kavli Institute for Cosmology Cambridge, Madingley Road, Cambridge CB3 0HA, UK
- Alex Krolewski
- ORCiD
- Perimeter Institute for Theoretical Physics, 31 Caroline St. North, Waterloo, ON NL2 2Y5, Canada; Waterloo Centre for Astrophysics, University of Waterloo , Waterloo, ON N2L 3G1, Canada
- Niall MacCrann
- ORCiD
- DAMTP, Centre for Mathematical Sciences, University of Cambridge , Wilberforce Road, Cambridge CB3 OWA, UK ; [email protected]
- Simone Ferraro
- ORCiD
- Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA; Berkeley Center for Cosmological Physics, University of California , Berkeley, CA 94720, USA
- Irene Abril-Cabezas
- ORCiD
- DAMTP, Centre for Mathematical Sciences, University of Cambridge , Wilberforce Road, Cambridge CB3 OWA, UK ; [email protected]
- Rui An
- Department of Physics and Astronomy, University of Southern California , Los Angeles, CA 90089, USA
- Zachary Atkins
- ORCiD
- Joseph Henry Laboratories of Physics, Jadwin Hall, Princeton University , Princeton, NJ 08544, USA
- Nicholas Battaglia
- ORCiD
- Department of Astronomy, Cornell University , Ithaca, NY 14853, USA
- J. Richard Bond
- ORCiD
- Canadian Institute for Theoretical Astrophysics, University of Toronto , Toronto, ON, M5S 3H8, Canada
- Erminia Calabrese
- ORCiD
- School of Physics and Astronomy, Cardiff University , The Parade, Cardiff, Wales CF24 3AA, UK
- Steve K. Choi
- ORCiD
- Department of Astronomy, Cornell University , Ithaca, NY 14853, USA; Department of Physics, Cornell University , Ithaca, NY 14853, USA
- Omar Darwish
- ORCiD
- Université de Genève, Département de Physique Théorique et CAP , 24 quai Ernest-Ansermet, CH-1211 Genève 4, Switzerland
- Mark J. Devlin
- ORCiD
- Department of Physics and Astronomy, University of Pennsylvania , 209 South 33rd Street, Philadelphia, PA 19104, USA
- Adriaan J. Duivenvoorden
- ORCiD
- Joseph Henry Laboratories of Physics, Jadwin Hall, Princeton University , Princeton, NJ 08544, USA; Center for Computational Astrophysics, Flatiron Institute , New York, NY 10010, USA
- Jo Dunkley
- ORCiD
- Joseph Henry Laboratories of Physics, Jadwin Hall, Princeton University , Princeton, NJ 08544, USA; Department of Astrophysical Sciences, Peyton Hall, Princeton University , Princeton, NJ 08544, USA
- J. Colin Hill
- ORCiD
- Department of Physics, Columbia University , 538 West 120th Street, New York, NY 10027, USA
- Matt Hilton
- ORCiD
- Wits Centre for Astrophysics, School of Physics, University of the Witwatersrand , Private Bag 3, 2050, Johannesburg, South Africa; Astrophysics Research Centre, School of Mathematics, Statistics, and Computer Science, University of KwaZulu-Natal , Westville Campus, Durban 4041, South Africa
- Kevin M. Huffenberger
- ORCiD
- Department of Physics, Florida State University , Tallahassee, FL 32306, USA
- Joshua Kim
- ORCiD
- Department of Physics and Astronomy, University of Pennsylvania , Philadelphia, PA 19104, USA
- Thibaut Louis
- ORCiD
- Université Paris-Saclay , CNRS/IN2P3, IJCLab, 91405 Orsay, France
- Mathew S. Madhavacheril
- ORCiD
- Department of Physics and Astronomy, University of Pennsylvania , 209 South 33rd Street, Philadelphia, PA 19104, USA
- Gabriela A. Marques
- ORCiD
- Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510, USA; Kavli Institute for Cosmological Physics, University of Chicago , 5640 S. Ellis Avenue, Chicago, IL 60637, USA
- Jeff McMahon
- ORCiD
- Kavli Institute for Cosmological Physics, University of Chicago , 5640 S. Ellis Avenue, Chicago, IL 60637, USA; Department of Astronomy and Astrophysics, University of Chicago , 5640 S. Ellis Avenue, Chicago, IL 60637, USA; Department of Physics, University of Chicago , Chicago, IL 60637, USA; Enrico Fermi Institute, University of Chicago , Chicago, IL 60637, USA
- Kavilan Moodley
- ORCiD
- Astrophysics Research Centre, School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal , Durban 4001, South Africa
- Lyman A. Page
- ORCiD
- Joseph Henry Laboratories of Physics, Jadwin Hall, Princeton University , Princeton, NJ 08544, USA
- Bruce Partridge
- ORCiD
- Department of Physics and Astronomy, Haverford College, Haverford, PA 19041, USA
- Frank J. Qu
- ORCiD
- DAMTP, Centre for Mathematical Sciences, University of Cambridge , Wilberforce Road, Cambridge CB3 OWA, UK ; [email protected]
- Emmanuel Schaan
- ORCiD
- SLAC National Accelerator Laboratory , Menlo Park, CA 94025, USA; Kavli Institute for Particle Astrophysics and Cosmology and Department of Physics, Stanford University , Stanford, CA 94305, USA
- Neelima Sehgal
- ORCiD
- Physics and Astronomy Department, Stony Brook University , Stony Brook, NY 11794, USA
- Blake D. Sherwin
- ORCiD
- DAMTP, Centre for Mathematical Sciences, University of Cambridge , Wilberforce Road, Cambridge CB3 OWA, UK ; [email protected]; Kavli Institute for Cosmology Cambridge, Madingley Road, Cambridge CB3 0HA, UK
- Cristóbal Sifón
- ORCiD
- Instituto de Física, Pontificia Universidad Católica de Valparaíso, Casilla 4059 , Valparaíso, Chile
- Suzanne T. Staggs
- ORCiD
- Joseph Henry Laboratories of Physics, Jadwin Hall, Princeton University , Princeton, NJ 08544, USA
- Alexander Van Engelen
- ORCiD
- School of Earth and Space Exploration, Arizona State University , Tempe, AZ 85287, USA
- Cristian Vargas
- ORCiD
- Instituto de Astrofísica and Centro de Astro-Ingenieía, Facultad de Física, Pontificia Universidad Católica de Chile , Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile
- Lukas Wenzl
- ORCiD
- Department of Astronomy, Cornell University , Ithaca, NY 14853, USA
- Martin White
- ORCiD
- Department of Physics, University of California , Berkeley, 366 LeConte Hall MC 7300, Berkeley, CA 94720-7300, USA
- Edward J. Wollack
- ORCiD
- NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA
- DOI
- https://doi.org/10.3847/1538-4357/ad31a5
- Journal volume & issue
-
Vol. 966,
no. 2
p. 157
Abstract
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 ${S}_{8}\equiv {\sigma }_{8}{({{\rm{\Omega }}}_{m}/0.3)}^{0.5}=0.813\pm 0.021$ 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 Ω _m , 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.
Keywords
- Observational cosmology
- Sigma8
- Cosmological parameters from large-scale structure
- Cosmic microwave background radiation
- Weak gravitational lensing
- Large-scale structure of the universe
