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

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

Research output: Contribution to journalArticlepeer-review


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 deg2 of the sky. Our galaxy sample, which covers ∼ 4143 deg2, 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 9.1σ. We constrain cosmological parameters from a joint analysis of galaxy and CMB lensing-galaxy power spectra considering a flat ΛCDM model, marginalized over 23 astrophysical and systematic nuisance parameters. We find the clustering amplitude S8 ≡ σ8m /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 (< 2σ) of statistical significance.

Original languageEnglish (US)
Article number033
JournalJournal of Cosmology and Astroparticle Physics
Issue number1
StatePublished - Jan 1 2024


  • cosmological parameters from CMBR
  • cosmological parameters from LSS
  • power spectrum
  • weak gravitational lensing

ASJC Scopus subject areas

  • Astronomy and Astrophysics


Dive into the research topics of 'Cosmological constraints from the tomography of DES-Y3 galaxies with CMB lensing from ACT DR4'. Together they form a unique fingerprint.

Cite this