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

• DOI: 10.3847/1538-4357/ad31a5
• Publication Date: 2024-05-02T10:53:46Z
• Authors: 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. Duiven...; Jo Dunkley; J. Colin Hill; Matt Hilton; Kevin M. Huffenbe...; Joshua Kim; Thibaut Louis; Mathew S. Madhava...; 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 Eng...; Cristian Vargas; Lukas Wenzl; Martin White; Edward J. Wollack
• Keywords: Observational cosmology; Cosmology and Nongalactic Astrophysics (astro-ph.CO); FOS: Physical sciences; Cosmological parameters from large-scale structure; Astronomy & Astrophysics; Astrophysics; 530; Atomic; 01 natural sciences; Particle and Plasma Physics; Cosmic microwave background radiation; Large-scale structure of the universe; 0103 physical sciences; Nuclear; Weak gravitational lensing; Space sciences; 500; Molecular; Particle and High Energy Physics; Sigma8; QB460-466; Particle and high energy physics; Physical Sciences; Astronomical sciences; [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]; 51 Physical Sciences; Astronomical and Space Sciences; 5107 Particle and High Energy Physics; Physical Chemistry (incl. Structural); Astrophysics - Cosmology and Nongalactic Astrophysics

Abstract We present tomographic measurements of structure growth using cross-correlations Atacama Cosmology Telescope (ACT) DR6 and Planck cosmic microwave background (CMB) lensing maps with the unWISE Blue Green galaxy samples, which span redshift ranges 0.2 ≲ z 1.1 0.3 1.8, respectively. improve on prior not just by making use new, high-precision ACT maps, but also including additional spectroscopic data for calibration analyzing our a more flexible theoretical model. determine amplitude matter fluctuations at low redshifts ( ≃ 0.2–1.6), finding <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>S</mml:mi> </mml:mrow> <mml:mn>8</mml:mn> </mml:msub> <mml:mo>≡</mml:mo> <mml:mi>σ</mml:mi> <mml:msup> <mml:mo stretchy="false">(</mml:mo> <mml:mi mathvariant="normal">Ω</mml:mi> <mml:mi>m</mml:mi> stretchy="true">/</mml:mo> <mml:mn>0.3</mml:mn> stretchy="false">)</mml:mo> <mml:mn>0.5</mml:mn> </mml:msup> <mml:mo>=</mml:mo> <mml:mn>0.813</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.021</mml:mn> </mml:math> cross-correlation alone S 8 = 0.810 ± 0.015 combination cross-correlations; these are fully consistent predictions from primary CMB assuming standard growth. The addition baryon acoustic oscillation breaks degeneracy between σ Ω m , allowing us to measure 0.813 0.020 Planck. These results agree expectations extrapolations in ΛCDM cosmology; consistency derived two samples ∼ 0.6 provides further check cosmological Our suggest that formation linear scales is well described even down 1.