Marques, G;
Madhavacheril, M;
Darwish, O;
Shaikh, S;
Aguena, M;
Alves, O;
Avila, S;
... Yanny, B; + view all
(2024)
Cosmological constraints from the tomography of DES-Y3 galaxies with CMB lensing from ACT DR4.
Journal of Cosmology and Astroparticle Physics
, 2024
, Article 033. 10.1088/1475-7516/2024/01/033.
Preview |
Text
Brooks_Cosmological constraints from the tomography of DES-Y3 galaxies with CMB lensing from ACT DR4_VoR.pdf - Published Version Download (1MB) | Preview |
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 ∼ 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 ≡ 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 (< 2σ) of statistical significance.
| Type: | Article |
|---|---|
| Title: | Cosmological constraints from the tomography of DES-Y3 galaxies with CMB lensing from ACT DR4 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/1475-7516/2024/01/033 |
| Publisher version: | https://doi.org/10.1088/1475-7516/2024/01/033 |
| Language: | English |
| Additional information: | Published by IOP Publishing Ltd on behalf of Sissa Medialab. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence, https://creativecommons.org/licenses/by/4.0/. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
| Keywords: | Cosmological parameters from CMBR, cosmological parameters from LSS, power spectrum, weak gravitational lensing |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10187499 |
Archive Staff Only
 |
View Item |
