Constraints on cosmology and baryonic feedback with a joint analysis of Dark Energy Survey Year 3 lensing data and ACT DR6 thermal Sunyaev-Zel’dovich effect observations
Year: 2026
Type: article
Abstract: We present a joint analysis of weak gravitational lensing (shear) data obtained from the first three years of observations by the Dark Energy Survey and thermal Sunyaev-Zel'dovich (tSZ) effect measurements from a combination of Atacama Cosmology Telescope (ACT) and Planck data. A combined analysis of shear (which traces the projected mass) with the tSZ effect (which traces the projected gas pressure) can jointly probe both the distribution of matter and the thermodynamic state of the gas, accounting for the correlated effects of baryonic feedback on both observables. We detect the shear$~\times~$tSZ cross-correlation at a 21$σ$ significance, the highest to date, after minimizing the bias from cosmic infrared background leakage in the tSZ map. By jointly modeling the small-scale shear auto-correlation and the shear$~\times~$tSZ cross-correlation, we obtain $S_8 = 0.811^{+0.015}_{-0.012}$ and $Ω_{\rm m} = 0.263^{+0.023}_{-0.030}$, results consistent with primary CMB analyses from Planck and P-ACT. We find evidence for reduced thermal gas pressure in dark matter halos with masses $M < 10^{14} \, M_{\odot}/h$, supporting predictions of enhanced feedback from active galactic nuclei on gas thermodynamics. A comparison of the inferred matter power suppression reveals a $2-4σ$ tension with hydrodynamical simulations that implement mild baryonic feedback, as our constraints prefer a stronger suppression. Finally, we investigate biases from cosmic infrared background leakage in the tSZ-shear cross-correlation measurements, employing mitigation techniques to ensure a robust inference. Our code is publicly available on GitHub.
DOI: 10.1103/zbwq-mjq5
Authors: S. Pandey, J. C. Hill, A. Alarcon, O. Alves, A. Amon, D. Anbajagane, F. Andrade-Oliveira, N. Battaglia, E. Baxter, K. Bechtol, M. R. Becker, G. M. Bernstein, J. Blazek, S. L. Bridle, E. Calabrese, H. Camacho, A. Campos, A. Carnero Rosell, M. Carrasco Kind, R. Cawthon, C. Chang, R. Chen, P. Chintalapati, A. Choi, J. Cordero, W. Coulton, M. Crocce, C. Davis, J. DeRose, M. Devlin, H. T. Diehl, S. Dodelson, C. Doux, A. Drlica-Wagner, K. Eckert, T. F. Eifler, J. Elvin-Poole, S. Everett, X. Fang, A. Ferté, P. Fosalba, O. Friedrich, M. Gatti, E. Gaztanaga, G. Giannini, V. Gluscevic, D. Gruen, R. A. Gruendl, B. Ried Guachalla, I. Harrison, W. G. Hartley, K. Herner, H. Huang, E. M. Huff, D. Huterer, B. Jain, M. Jarvis, E. Krause, N. Kuropatkin, A. Kusiak, P. Leget, P. Lemos, A. R. Liddle, M. Lokken, N. MacCrann, J. McCullough, K. Moodley, J. Muir, J. Myles, A. Navarro-Alsina, Y. Omori, Y. Park, B. Partridge, A. Porredon, J. Prat, M. Raveri, A. Refregier, R. P. Rollins, A. Roodman, R. Rosenfeld, A. J. Ross, E. S. Rykoff, S. Samuroff, J. Sanchez, C. Sánchez, L. F. Secco, I. Sevilla-Noarbe, S. Shaikh, E. Sheldon, T. Shin, Cristóbal Sifón, C. To, A. Troja, M. A. Troxel, I. Tutusaus, T. N. Varga, N. Weaverdyck, R. H. Wechsler, E. J. Wollack, B. Yanny, B. Yin, Y. Zhang, J. Zuntz, S. S. Allam, D. Bacon, S. Bocquet, D. Brooks, D. L. Burke, J. Carretero, R. Cawthon, M. Costanzi, L. N. da Costa, M. E. da Silva Pereira, T. M. Davis, S. Desai, J. Frieman, J. García-Bellido, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, D. J. James, N. Jeffrey, S. Lee, J. L. Marshall, J. Mena-Fernández, R. Miquel, J. J. Mohr, R. L. C. Ogando, A. A. Plazas Malagón, A. K. Romer, E. Sanchez, B. Santiago, M. Smith, E. Suchyta, M. E. C. Swanson, D. Thomas, V. Vikram, A. R. Walker, J. Weller, P. Wiseman
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, U.S. Department of Energy, National Aeronautics and Space Administration, Alfred P. Sloan Foundation, Princeton University, University of Pennsylvania, Ohio State University, University of Chicago, University of Portsmouth, Centres de Recerca de Catalunya, National Energy Research Scientific Computing Center, University College London, European Commission, University of Sussex, Deutsche Forschungsgemeinschaft, Generalitat de Catalunya, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Financiadora de Estudos e Projetos, Ministerio de Ciencia e Innovación, Agencia Nacional de Investigación y Desarrollo, Institut de Física d'Altes Energies, National Institute of Standards and Technology, University of Illinois at Urbana-Champaign, Office of Science, Science and Technology Facilities Council, European Regional Development Fund, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, High Energy Physics, Integrated Electronics Engineering Center, Binghamton University, Argonne National Laboratory, Fermilab, Lawrence Berkeley National Laboratory, SLAC National Accelerator Laboratory
Awards: G1054097061, G1079818582, G1143651532, G122673668, G1286236842, G1313983767, G1336129044, G1451874870, G1632040200, G1677143136, G1746333638, G179674260, G1863003419, G2011917337, G2233160401, G2376186588, G2554159582, G2638771445, Illuminating Galaxy Formation with the Atacama Cosmology Telescope, BROAD BANDWIDTH METAMATERIAL ANTIREFLECTION COATINGS FOR MEASUREMENT OF THE COSMIC MICROWAVE BACKGROUND WE PROPOSE TO DEVELOP BROAD-BAND METAMATERIAL, G302750986, THIS PROPOSAL SEEKS SUPPORT FOR THE DEVELOPMENT OF MILLIMETER-WAVELENGTH MULTICHROIC POLARIMETERS OPTIMIZED FOR DETECTING COSMIC MICROWAVE BACKGROUND, G3154116105, G3439265645, G3562095311, G3685081974, The Dark Energy Survey Data Management Operations, G419881185, Gravitational Physics from the Cosmic Microwave Background, G42916606, G4361631179, G4501827968, G454676879, G4655338613, G498139845, G5004724115, G5076365615, Collaborative Research with the Atacama Cosmology Telescope (ACT): Probing Fundamental Physics Through Observations of Cosmic Structure, G5252970658, G526230902, G5287069595, Advanced ACTPol, G6471802762, G6513613686, G656518222, G6652958823, G6676276723, Gravitational Physics from the Cosmic Microwave Background, G6941735741, G7354628648, G759921648, G7788408655, G7835623888, G8284171658, Collaborative Research: The Dark Energy Survey Data Management Operations, CENTRO DE ASTROFISICA Y TECNOLOGIAS AFINES (CATA), G8920660035, G946511789
OpenAlex ID: W4414576068