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

Journal Article · · The Astrophysical Journal
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  1. University of Cambridge (United Kingdom); Kavli Institute for Cosmology Cambridge (United Kingdom)
  2. Perimeter Institute for Theoretical Physics, Waterloo, ON (Canada); University of Waterloo, ON (Canada)
  3. University of Cambridge (United Kingdom)
  4. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)
  5. University of Southern California, Los Angeles, CA (United States)
  6. Princeton University, NJ (United States)
  7. Cornell University, Ithaca, NY (United States)
  8. University of Toronto, ON (Canada)
  9. Cardiff University, Wales (United Kingdom)
  10. Université de Genève (Switzerland)
  11. University of Pennsylvania, Philadelphia, PA (United States)
  12. Princeton University, NJ (United States); Flatiron Institute, New York, NY (United States)
  13. Columbia University, New York, NY (United States)
  14. University of the Witwatersrand, Johannesburg (South Africa); University of KwaZulu-Natal, Durban (South Africa)
  15. Florida State University, Tallahassee, FL (United States)
  16. Université Paris-Saclay, Orsay (France)
  17. Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); University of Chicago, IL (United States)
  18. University of Chicago, IL (United States)
  19. University of KwaZulu-Natal, Durban (South Africa)
  20. Haverford College, Haverford, PA (United States)
  21. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford University, CA (United States)
  22. Stony Brook University, NY (United States)
  23. Pontificia Universidad Católica de Valparaíso (Chile)
  24. Arizona State University, Tempe, AZ (United States)
  25. Universidad Católica de Chile, Santiago (Chile)
  26. University of California, Berkeley, CA (United States)
  27. NASA/Goddard Space Flight Center, Greenbelt, MD (United States)

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 S8 ≡ σ8m/0.3)0.5 = 0.813 ± 0.021 using the ACT cross-correlation alone and S8 = 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 σ8 and Ωm, allowing us to measure σ8 = 0.813 ± 0.020 from the cross-correlation of unWISE with ACT and σ8 = 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 σ8 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.

Research Organization:
Arizona State U.; Cambridge U., DAMTP; Cambridge U., Inst. of Astron.; Canadian Inst. Theor. Astrophys.; Cardiff U.; Chicago U., KICP; Chile U., Santiago; Columbia U.; Cornell U.; Cornell U., LNS; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Flatiron Inst., New York; Florida State U.; Geneva U., CAP; Geneva U., Dept. Theor. Phys.; Haverford Coll.; IJCLab, Orsay; KwaZulu Natal U.; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); NASA, Goddard; Pennsylvania U.; Perimeter Inst. Theor. Phys.; Princeton U.; Princeton U., Astrophys. Sci. Dept.; SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); SUNY, Stony Brook; Southern California U.; Stony Brook University, NY (United States); UC, Berkeley; UPenn, Philadelphia; Valparaiso U., Catolica; Waterloo U., IQC; Witwatersrand U.
Sponsoring Organization:
European Union's Horizon 2020 research and innovation program; National Aeronautics and Space Administration (NASA); National Energy Research Scientific Computing Center (NERSC); National Science Foundation (NSF); U.S. National Science Foundation; US Department of Energy; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
ACT
Grant/Contract Number:
89243024CSC000002; AC02-05CH11231; AC02-07CH11359; AC02-76SF00515; SC0020441; SC0025309
OSTI ID:
2897249
Report Number(s):
FERMILAB-PUB--23-519-PPD; FERMILAB-PUB-23-519-PPD; arXiv:2309.05659
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 966; ISSN 0004-637X; ISSN 1538-4357
Publisher:
American Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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