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

Marques, G.A., Madhavacheril, M.S., Darwish, O., Shaikh, S., Aguena, M., Alves, O., Avila, S., Bacon, D., Baxter, E.J., Bechtol, K., Becker, M.R., Bertin, E., Blazek, J., Richard Bond, J., Brooks, D., Cai, H., Calabrese, E. ORCID: https://orcid.org/0000-0003-0837-0068, Carnero Rosell, A., Carrasco Kind, M., Carretero, J., Cawthon, R., Crocce, M., da Costa, L.N., Pereira, M.E.S., De Vicente, J., Desai, S., Diehl, H.T., Doel, P., Doux, C., Drlica-Wagner, A., Dunkley, J., Elvin-Poole, J., Everett, S., Ferraro, S., Ferrero, I., Flaugher, B., Fosalba, P., García-Bellido, J., Gatti, M., Giannini, G., Gluscevic, V., Gruen, D., Gruendl, R.A., Gutierrez, G., Harrison, I. ORCID: https://orcid.org/0000-0002-4437-0770, Colin Hill, J., Hinton, S.R., Hollowood, D.L., Honscheid, K., Huterer, D., Jeffrey, N., Kim, J., Kuehn, K., Lahav, O., Lemos, P., Lima, M., Huffenberger, K.M., MacCrann, N., Marshall, J.L., Mena-Fernández, J., Miquel, R., Mohr, J.J., Moodley, K., Muir, J., Naess, S., Nati, F., Page, L.A., Palmese, A., Plazas Malagón, A.A., Porredon, A., Prat, J., Qu, F.J., Raveri, M., Ross, A.J., Rykoff, E.S., Farren, G.S., Samuroff, S., Sanchez, E., Schubnell, M., Sehgal, N., Sevilla-Noarbe, I., Sheldon, E., Sherwin, B.D., Sifón, C., Smith, M., Spergel, D.N., Staggs, S.T., Suchyta, E., Tarle, G., To, C., Van Engelen, A., Weaverdyck, N., Weller, J., Wenzl, L., Wiseman, P., Wollack, E.J., Yanny, B. and The ACT and DES collaborations 2024. Cosmological constraints from the tomography of DES-Y3 galaxies with CMB lensing from ACT DR4. Journal of Cosmology and Astroparticle Physics 2024 (01) , 033. 10.1088/1475-7516/2024/01/033

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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 ∼ 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<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 S 8 ≡ σ 8(Ω 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 (< 2σ) of statistical significance.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Additional Information:	License information from Publisher: LICENSE 1: URL: http://creativecommons.org/licenses/by/4.0/, Type: cc-by
Publisher:	IOP Publishing
ISSN:	1475-7516
Date of First Compliant Deposit:	15 January 2024
Date of Acceptance:	10 October 2023
Last Modified:	23 Feb 2024 16:00
URI:	https://orca.cardiff.ac.uk/id/eprint/165491

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