The Atacama Cosmology Telescope: Cosmology from Cross-correlations of unWISE Galaxies and ACT DR6 CMB Lensing
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- Cambridge U., DAMTP; Cambridge U., Inst. of Astron.
- Perimeter Inst. Theor. Phys.; Waterloo U., IQC
- Cambridge U., DAMTP
- LBL, Berkeley; UC, Berkeley
- Southern California U.
- Princeton U.
- Cornell U., LNS
- Canadian Inst. Theor. Astrophys.
- Cardiff U.
- Cornell U.; Cornell U., LNS
- Geneva U., CAP; Geneva U., Dept. Theor. Phys.
- Pennsylvania U.
- Flatiron Inst., New York; Princeton U.
- Princeton U.; Princeton U., Astrophys. Sci. Dept.
- Columbia U.
- Witwatersrand U.; KwaZulu Natal U.
- Florida State U.
- IJCLab, Orsay
- UPenn, Philadelphia
- Fermilab; Chicago U., KICP
- KwaZulu Natal U.
- Haverford Coll.
- SUNY, Stony Brook
- Valparaiso U., Catolica
- Arizona State U.
- Chile U., Santiago
- UC, Berkeley
- NASA, Goddard
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 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.
- Research Organization:
- SUNY, Stony Brook; Columbia U.; Cardiff U.; Chile U., Santiago; Cornell U.; UC, Berkeley; Geneva U., CAP; Princeton U.; Pennsylvania U.; Cambridge U., DAMTP; Chicago U., KICP; Geneva U., Dept. Theor. Phys.; Florida State U.; Princeton U., Astrophys. Sci. Dept.; Arizona State U.; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Cambridge U., Inst. of Astron.; Perimeter Inst. Theor. Phys.; Witwatersrand U.; Southern California U.; KwaZulu Natal U.; UPenn, Philadelphia; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Flatiron Inst., New York; Waterloo U., IQC; Haverford Coll.; NASA, Goddard; Cornell U., LNS; Canadian Inst. Theor. Astrophys.; Valparaiso U., Catolica; IJCLab, Orsay
- Sponsoring Organization:
- US Department of Energy
- Grant/Contract Number:
- AC02-07CH11359; 89243024CSC000002
- OSTI ID:
- 2000970
- Report Number(s):
- FERMILAB-PUB-23-519-PPD; oai:inspirehep.net:2696783; arXiv:2309.05659
- Journal Information:
- Astrophys.J., Journal Name: Astrophys.J. Journal Issue: 2 Vol. 966
- Country of Publication:
- United States
- Language:
- English
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