Papers › Cosmological constraints from the tomography of DES-Y3 galaxies with CMB lensing from ACT DR4
Cosmological constraints from the tomography of DES-Y3 galaxies with CMB lensing from ACT DR4
G. A. Marques, M. S. Madhavacheril, O. Darwish, S. Shaikh, M. Aguena, O. Alves, S. Avila, D. Bacon, 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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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 ∼436 sq.deg. of the sky. Our galaxy sample, which covers ∼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 S₈≡σ₈ (Ωₘ/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 S₈ compared to results from measurements of CMB anisotropies by the Planck satellite, although at a mild level (< 2 σ) of statistical significance.
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