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Dark Energy Survey Year 3: Blue shear

J. McCullough^1,2,3,*, A. Amon¹, E. Legnani⁴, D. Gruen^5,6, A. Roodman³, O. Friedrich⁵, N. MacCrann⁷, M. Becker⁸, J. Myles¹ et al. (DES Collaboration)

J. Myles¹, S. Dodelson^9,10, S. Samuroff¹¹, J. Blazek¹¹, J. Prat^12,13, A. Pieres^14,15, A. Ferté³, A. Alarcon^8,16, A. Drlica-Wagner^12,17,18, A. Choi¹⁹, A. Navarro-Alsina²⁰, A. Campos^21,10, A. A. Plazas Malagón^22,3, A. Porredon^23,24, A. J. Ross²⁵, A. Carnero Rosell^26,14, B. Yin²¹, B. Flaugher¹⁷, B. Yanny¹⁷, C. Sánchez²⁷, C. Chang^12,18, C. Davis²², C. To²⁵, C. Doux^27,28, D. Brooks²⁹, D. J. James³⁰, D. Sanchez Cid²³, D. L. Hollowood³¹, D. Huterer³², E. S. Rykoff^22,3, E. Gaztanaga^33,34,16, E. M. Huff³⁵, E. Suchyta³⁶, E. Sheldon³⁷, E. Sanchez²³, F. Tarsitano³⁸, F. Andrade-Oliveira³², F. J. Castander^33,16, G. M. Bernstein²⁷, G. Gutierrez¹⁷, G. Giannini^39,18, G. Tarle³², H. T. Diehl¹⁷, H. Huang^40,41, I. Harrison⁴², I. Sevilla-Noarbe²³, I. Tutusaus⁴³, I. Ferrero⁴⁴, J. Elvin-Poole⁴⁵, J. L. Marshall⁴⁶, J. Muir⁴⁷, J. Weller^48,49, J. Zuntz⁵⁰, J. Carretero³⁹, J. DeRose⁵¹, J. Frieman^17,18, J. Cordero⁵², J. De Vicente²³, J. García-Bellido⁵³, J. Mena-Fernández⁵⁴, K. Eckert²⁷, A. K. Romer⁵⁵, K. Bechtol⁵⁶, K. Herner¹⁷, K. Honscheid^25,57, K. Kuehn^58,59, L. F. Secco¹⁸, L. N. da Costa¹⁴, M. Paterno¹⁷, M. Soares-Santos³², M. Gatti²⁷, M. Raveri⁶⁰, M. Yamamoto⁶¹, M. Smith⁶², M. Carrasco Kind^63,64, M. A. Troxel⁶¹, M. Jarvis²⁷, M. E. C. Swanson⁶³, N. Weaverdyck^65,51, O. Lahav²⁹, P. Doel²⁹, P. Wiseman⁶⁶, R. Miquel^67,39, R. A. Gruendl^63,64, R. Cawthon⁶⁸, S. Allam¹⁷, S. R. Hinton⁶⁹, S. L. Bridle⁵², S. Bocquet⁷⁰, S. Desai⁷¹, S. Pandey²⁷, S. Everett⁷², S. Lee³⁵, T. Shin⁷³, M. Aguena¹⁴, O. Alves³², E. Buckley-Geer^12,17, D. L. Burke^22,3, C. Conselice^52,74, M. Crocce^33,16, M. E. S. Pereira⁷⁵, A. Farahi^76,77, K. Honscheid^25,57, N. Jeffrey²⁹, M. Lima^78,14, A. Palmese²¹, M. Schubnell³², V. Vikram⁸, M. Vincenzi⁷⁹, and Y. Zhang⁸⁰ (DES Collaboration)

¹Department of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, New Jersey 08544, USA
²Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, California 94305, USA
³SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
⁴Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB, 08193 Bellaterra Barcelona, Spain
⁵University Observatory, Faculty of Physics, Ludwig-Maximilians-Universität, Scheinerstrasse 1, 81679 Munich, Germany
⁶Excellence Cluster ORIGINS, Boltzmannstrasse 2, 85748 Garching, Germany
⁷Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge CB3 0WA, United Kingodm
⁸Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, USA
⁹Department of Physics,Carnegie Mellon University, Pittsburgh, Pennsylvania 15312, USA
¹⁰NSF AI Planning Institute for Physics of the Future, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
¹¹Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA
¹²Department of Astronomy and Astrophysics, University of Chicago, Chicago, Illinois 60637, USA
¹³Nordita, KTH Royal Institute of Technology and Stockholm University, Hannes Alfvéns väg 12, SE-10691 Stockholm, Sweden
¹⁴Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ - 20921-400, Brazil
¹⁵Observatório Nacional, Rua Gal. José Cristino 77, Rio de Janeiro, RJ - 20921-400, Brazil
¹⁶Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans, s/n, 08193 Barcelona, Spain
¹⁷Fermi National Accelerator Laboratory, P. O. Box 500, Batavia, Illinois 60510, USA
¹⁸Kavli Institute for Cosmological Physics, University of Chicago, Chicago, Illinois 60637, USA
¹⁹NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, Maryland 20771, USA
²⁰Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, 13083-859, Campinas, SP, Brazil
²¹Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15312, USA
²²Kavli Institute for Particle Astrophysics and Cosmology, P. O. Box 2450, Stanford University, Stanford, California 94305, USA
²³Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain
²⁴Ruhr University Bochum, Faculty of Physics and Astronomy, Astronomical Institute, German Centre for Cosmological Lensing, 44780 Bochum, Germany
²⁵Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, Ohio 43210, USA
²⁶Instituto de Astrofisica de Canarias, E-38205 La Laguna, Tenerife, Spain
²⁷Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
²⁸Université Grenoble Alpes, CNRS, LPSC-IN2P3, 38000 Grenoble, France
²⁹Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, United Kingdom
³⁰Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, Massachusetts 02138, USA
³¹Santa Cruz Institute for Particle Physics, Santa Cruz, California 95064, USA
³²Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
³³Institut d’Estudis Espacials de Catalunya (IEEC), 08034 Barcelona, Spain
³⁴Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth, PO1 3FX, United Kingdom
³⁵Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, California 91109, USA
³⁶Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
³⁷Brookhaven National Laboratory, Bldg 510, Upton, New York 11973, USA
³⁸Department of Physics, ETH Zurich, Wolfgang-Pauli-Strasse 16, CH-8093 Zurich, Switzerland
³⁹Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB, 08193 Bellaterra (Barcelona) Spain
⁴⁰Department of Astronomy/Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, Arizona 85721-0065, USA
⁴¹Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
⁴²School of Physics and Astronomy, Cardiff University, CF24 3AA, United Kingdom
⁴³Institut de Recherche en Astrophysique et Planétologie (IRAP), Université de Toulouse, CNRS, UPS, CNES, 14 Av. Edouard Belin, 31400 Toulouse, France
⁴⁴Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029 Blindern, NO-0315 Oslo, Norway
⁴⁵Department of Physics and Astronomy, University of Waterloo, 200 University Avenue W, Waterloo, Ontario N2L 3G1, Canada
⁴⁶George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, and Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
⁴⁷Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Ontario N2L 2Y5, Canada
⁴⁸Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, 85748 Garching, Germany
⁴⁹Universitäts-Sternwarte, Fakultät für Physik, Ludwig-Maximilians Universität München, Scheinerstrasse 1, 81679 München, Germany
⁵⁰Institute for Astronomy, University of Edinburgh, Edinburgh EH9 3HJ, United Kingdom
⁵¹Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
⁵²Jodrell Bank Center for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
⁵³Instituto de Fisica Teorica UAM/CSIC, Universidad Autonoma de Madrid, 28049 Madrid, Spain
⁵⁴LPSC Grenoble - 53, Avenue des Martyrs 38026 Grenoble, France
⁵⁵Department of Physics and Astronomy, Pevensey Building, University of Sussex, Brighton, BN1 9QH, United Kingdom
⁵⁶Physics Department, 2320 Chamberlin Hall, University of Wisconsin-Madison, 1150 University Avenue Madison, Wisconsin 53706-1390
⁵⁷Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
⁵⁸Australian Astronomical Optics, Macquarie University, North Ryde, New South Wales 2113, Australia
⁵⁹Lowell Observatory, 1400 Mars Hill Road, Flagstaff, Arizona 86001, USA
⁶⁰Department of Physics, University of Genova and INFN, Via Dodecaneso 33, 16146, Genova, Italy
⁶¹Department of Physics, Duke University Durham, North Carolina 27708, USA
⁶²Physics Department, Lancaster University, Lancaster, LA1 4YB, United Kingdom
⁶³Center for Astrophysical Surveys, National Center for Supercomputing Applications, 1205 West Clark Street, Urbana, Illinois 61801, USA
⁶⁴Department of Astronomy, University of Illinois at Urbana-Champaign, 1002 W. Green Street, Urbana, Illinois 61801, USA
⁶⁵Department of Astronomy, University of California, Berkeley, 501 Campbell Hall, Berkeley, California 94720, USA
⁶⁶School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom
⁶⁷Institució Catalana de Recerca i Estudis Avançats, E-08010 Barcelona, Spain
⁶⁸Physics Department, William Jewell College, Liberty, Missouri 64068, USA
⁶⁹School of Mathematics and Physics, University of Queensland, Brisbane, Queensland 4072, Australia
⁷⁰University Observatory, Faculty of Physics, Ludwig-Maximilians-Universität, Scheinerstrasse 1, 81679 Munich, Germany
⁷¹Department of Physics, IIT Hyderabad, Kandi, Telangana 502285, India
⁷²California Institute of Technology, 1200 East California Boulevard, MC 249-17, Pasadena, California 91125, USA
⁷³Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA
⁷⁴University of Nottingham, School of Physics and Astronomy, Nottingham NG7 2RD, United Kingdom
⁷⁵Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
⁷⁶Departments of Statistics and Data Sciences, University of Texas at Austin, Austin, Texas 78757, USA
⁷⁷NSF-Simons AI Institute for Cosmic Origins, University of Texas at Austin, Austin, Texas 78757, USA
⁷⁸Departamento de Física Matemática, Instituto de Física, Universidade de São Paulo, CP 66318, São Paulo, SP, 05314-970, Brazil
⁷⁹Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, United Kingdom
⁸⁰Cerro Tololo Inter-American Observatory, NSF’s National Optical-Infrared Astronomy Research Laboratory, Casilla 603, La Serena, Chile

^*Contact author: jmccullough@princeton.edu

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Phys. Rev. D 113, 103509 – Published 6 May, 2026

DOI: https://doi.org/10.1103/wmp3-qc3p

Abstract

Modeling the intrinsic alignment (IA) of galaxies poses a challenge to weak lensing analyses. Using the Dark Energy Survey Year 3 shape catalog, we expect less impact from IA when we limit the sample to blue, star-forming galaxies. The cosmological parameter constraints from this blue cosmic shear sample are stable to IA model choice, unlike passive galaxies in the full DES Y3 sample, the goodness-of-fit is improved and the $Ω_{m}$ and $S_{8}$ better agree with the observations from Planck on the cosmic microwave background. Mitigating IA with sample selection in DES, rather than flexible model choices, can reduce uncertainty in $S_{8}$ by a factor of 1.5.

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Dark Energy Survey Year 3: Blue shear

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