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Cosmological constraints from the tomography of DES-Y3 galaxies with CMB lensing from ACT DR4

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arxiv 2306.17268 v2 pith:AINNGLX6 submitted 2023-06-29 astro-ph.CO

G. A. Marques , M. S. Madhavacheril , O. Darwish , S. Shaikh , M. Aguena , O. Alves , S. Avila , D. Bacon
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E. J. Baxter K. Bechtol M. R. Becker E. Bertin J. Blazek J. Richard Bond D. Brooks H. Cai E. Calabrese A. Carnero Rosell M. Carrasco Kind J. Carretero R. Cawthon M. Crocce L. N. da Costa M. E. S. Pereira J. De Vicente S. Desai H. T. Diehl P. Doel C. Doux A. Drlica-Wagner J. Dunkley J. Elvin-Poole S. Everett Simone Ferraro I. Ferrero B. Flaugher P. Fosalba J. García-Bellido M. Gatti G. Giannini V. Gluscevic D. Gruen R. A. Gruendl G. Gutierrez I. Harrison J. Colin Hill S. R. Hinton D. L. Hollowood K. Honscheid D. Huterer N. Jeffrey J. Kim K. Kuehn O. Lahav P. Lemos M. Lima K. M. Huffenberger N. MacCrann J. L. Marshall J. Mena-Fernández R. Miquel J. J. Mohr K. Moodley J. Muir S. Naess F. Nati L. A. Page A. Palmese A. A. Plazas Malagón A. Porredon J. Prat F. J. Qu M. Raveri A. J. Ross E. S. Rykoff G. S. Farren S. Samuroff E. Sanchez M. Schubnell I. Sevilla-Noarbe E. Sheldon B. D. Sherwin C. Sifón M. Smith D. N. Spergel S. T. Staggs E. Suchyta G. Tarle C. To A. Van Engelen N. Weaverdyck J. Weller L. Wenzl P. Wiseman E. J. Wollack B. Yanny
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abstract

We present a measurement of the cross-correlation between the MagLim galaxies selected from the Dark Energy Survey (DES) first three years of observations (Y3) and cosmic microwave background (CMB) lensing from the Atacama Cosmology Telescope (ACT) Data Release 4 (DR4), reconstructed over $\sim 436$ sq.deg. of the sky. Our galaxy sample, which covers $\sim 4143$ sq.deg., is divided into six redshift bins spanning the redshift range of $0.20<z<1.05$. We adopt a blinding procedure until passing all consistency and systematics tests. After imposing scale cuts for the cross-power spectrum measurement, we reject the null hypothesis of no correlation at 9.1\sigma. We constrain cosmological parameters from a joint analysis of galaxy and CMB lensing-galaxy power spectra considering a flat \LCDM model, marginalized over 23 astrophysical and systematic nuisance parameters. We find the clustering amplitude $S_8\equiv \sigma_8 (\Omega_m/0.3)^{0.5} = 0.75^{+0.04}_{-0.05}$. In addition, we constrain the linear growth of cosmic structure as a function of redshift. Our results are consistent with recent DES Y3 analyses and suggest a preference for a lower $S_8$ compared to results from measurements of CMB anisotropies by the Planck satellite, although at a mild level ($< 2 \sigma$) of statistical significance.

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  1. Cosmology from Planck CMB Lensing and DESI DR1 Quasar Tomography

    astro-ph.CO 2025-06 conditional novelty 6.0 of 10

    DESI DR1 quasars cross-correlated with Planck PR4 lensing give sigma8 = 0.929 and S8 = 0.922, about 1.5 sigma above Planck's LCDM prediction, and a sound-horizon-free H0 = 69.1 km/s/Mpc.

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