Dark Energy Survey Year 3 results: redshift calibration of the weak lensing source galaxies
J. MylesSLAC National Accelerator Laboratory, Menlo Park, CA 94025, USAA. AlarconArgonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USAA. AmonSLAC National Accelerator Laboratory, Menlo Park, CA 94025, USAC. SánchezDepartment of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USAS. EverettJoseph DeRoseDepartment of Astronomy, University of California, Berkeley, 501 Campbell Hall, Berkeley, CA 94720, USAJ. McCulloughKavli Institute for Particle Astrophysics and Cosmology, PO Box 2450, Stanford University, Stanford, CA 94305, USAD. GruenSLAC National Accelerator Laboratory, Menlo Park, CA 94025, USAG. M. BernsteinDepartment of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USAM. A. TroxelDepartment of Physics, Duke University Durham, NC 27708, USAScott DodelsonDepartment of Physics, Carnegie Mellon University, Pittsburgh, PA 15312, USAA. CamposDepartment of Physics, Carnegie Mellon University, Pittsburgh, PA 15312, USAN. MacCrannDepartment of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge CB3 0WA, UKB. YinDepartment of Physics, Carnegie Mellon University, Pittsburgh, PA 15312, USAMarco RaveriKavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637, USAA. AmaraInstitute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 3FX, UKM. R. BeckerArgonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USAA. ChoiCenter for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USAJ. CorderoJodrell Bank Center for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UKK. EckertDepartment of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USAM. GattiInstitut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB, E-08193 Bellaterra (Barcelona) SpainG. GianniniInstitut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB, E-08193 Bellaterra (Barcelona) SpainJ. GschwendLaboratório Interinstitucional de e-AstronomiaR A GruendlDepartment of Astronomy, University of Illinois at Urbana-Champaign, 1002 W. Green Street, Urbana, IL 61801, USAI. HarrisonJodrell Bank Center for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UKW.G HartleyDépartement de Physique Théorique and Center for Astroparticle Physics, Université de Genève, 24 quai Ernest Ansermet, CH-1211 Geneva, SwitzerlandErica HuffJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, USAN. KuropatkinFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAH. LinFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USADaniel MastersJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USAR. MiquelInstitució Catalana de Recerca i Estudis Avançats, E-08010 Barcelona, SpainJ. PratDepartment of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637, USAA. RoodmanSLAC National Accelerator Laboratory, Menlo Park, CA 94025, USAE. S. RykoffStanford UniversityI. Sevilla-NoarbeCentro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), E-28040 Madrid, SpainE. SheldonBrookhaven National Laboratory, Bldg 510, Upton, NY 11973, USAR.H. WechslerSLAC National Accelerator Laboratory, Menlo Park, CA 94025, USAB. YannyFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAT. M. C. AbbottCerro Tololo Inter-American Observatory, NSF’s National Optical-Infrared Astronomy Research Laboratory, Casilla 603, La Serena, ChileM. AguenaLaboratório Interinstitucional de e-Astronomia – LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ – 20921-400, BrazilS. AllamFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAJ. AnnisFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USADavid BaconInstitute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 3FX, UKE. BertinSorbonne Universités, UPMC Université Paris 06, UMR 7095, Institut d’Astrophysique de Paris, F-75014 Paris, FranceS BhargavaDepartment of Physics and Astronomy, Pevensey Building, University of Sussex, Brighton BN1 9QH, UKSarah BridleJodrell Bank Center for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UKDavid BrooksDepartment of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT, UKD. L. BurkeStanford UniversityA. Carnero RosellUniversidad de La Laguna, Dpto. Astrofísica, E-38206 La Laguna, Tenerife, SpainM. Carrasco KindDepartment of Astronomy, University of Illinois at Urbana-Champaign, 1002 W. Green Street, Urbana, IL 61801, USAJ. CarreteroInstitut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB, E-08193 Bellaterra (Barcelona) SpainF. J. CastanderInstitute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans, s/n, E-08193 Barcelona, SpainChristopher J. ConseliceJodrell Bank Center for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UKM. CostanziInstitute for Fundamental Physics of the Universe, Via Beirut 2, I-34014 Trieste, ItalyM. CrocceInstitut d’Estudis Espacials de Catalunya (IEEC), E-08034 Barcelona, SpainL. N. da CostaObservatório Nacional, Rua Gal. José Cristino 77, Rio de Janeiro, RJ – 20921-400, BrazilM. E. S. PereiraDepartment of Physics, University of Michigan, Ann Arbor, MI 48109, USAS. DesaiDepartment of Physics, IIT Hyderabad, Kandi, Telangana 502285, IndiaH. T. DiehlFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAT F EiflerDepartment of Astronomy/Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065, USAJ. Elvin-PooleCenter for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USAA. E. EvrardDepartment of Astronomy, University of Michigan, Ann Arbor, MI 48109, USAI. FerreroInstitute of Theoretical Astrophysics, University of Oslo, PO Box 1029 Blindern, NO-0315 Oslo, NorwayA. FertéJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, USAB. FlaugherFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAP. FosalbaInstitut d’Estudis Espacials de Catalunya (IEEC), E-08034 Barcelona, SpainJ. García-BellidoInstituto de Fisica Teorica UAM/CSIC, Universidad Autonoma de Madrid, E-28049 Madrid, SpainE. GaztañagaInstitut d’Estudis Espacials de Catalunya (IEEC), E-08034 Barcelona, SpainT. GiannantonioInstitute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UKS. R. HintonSchool of Mathematics and Physics, University of Queensland, Brisbane, QLD 4072, AustraliaD L HollowoodK. HonscheidCenter for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USAB. HoyleFaculty of Physics, Ludwig-Maximilians-Universität, Scheinerstr. 1, D-81679 Munich, GermanyDragan HutererDepartment of Physics, University of Michigan, Ann Arbor, MI 48109, USAD. JamesCenter for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USAE. KrauseDepartment of Astronomy/Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065, USAK. KuehnAustralian Astronomical Optics, Macquarie University, North Ryde, NSW 2113, AustraliaO. LahavDepartment of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT, UKM. LimaDepartamento de Física Matemática, Instituto de Física, Universidade de São Paulo, CP 66318, São Paulo, SP, 05314-970, BrazilM A G MaiaLaboratório Interinstitucional de e-Astronomia – LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ – 20921-400, BrazilJ L MarshallDepartment of Physics and Astronomy, George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University, College Station, TX 77843, USAPaul MartiniRadcliffe Institute for Advanced Study, Harvard University, Cambridge, MA 02138, USAP. MelchiorDepartment of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, NJ 08544, USAF. MenanteauDepartment of Astronomy, University of Illinois at Urbana-Champaign, 1002 W. Green Street, Urbana, IL 61801, USAJ. J. MohrFaculty of Physics, Ludwig-Maximilians-Universität, Scheinerstr. 1, D-81679 Munich, GermanyR. MorganPhysics Department, 2320 Chamberlin Hall, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706-1390, USAJ. MuirStanford UniversityR. L. C. OgandoLaboratório Interinstitucional de e-AstronomiaA. PalmeseFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAF. Paz-ChinchónNational Center for Supercomputing Applications, 1205 West Clark St., Urbana, IL 61801, USAA A PlazasDepartment of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, NJ 08544, USAM. Rodríguez-MonroyCentro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), E-28040 Madrid, SpainS SamuroffDepartment of Physics, Carnegie Mellon University, Pittsburgh, PA 15312, USAE. SánchezCentro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), E-28040 Madrid, SpainV. ScarpineFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAL.F. SeccoDepartment of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USAS. SerranoInstitute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans, s/n, E-08193 Barcelona, SpainM. SmithSchool of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UKM. Soares-SantosDepartment of Physics, University of Michigan, Ann Arbor, MI 48109, USA
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ABSTRACT Determining the distribution of redshifts of galaxies observed by wide-field photometric experiments like the Dark Energy Survey (DES) is an essential component to mapping the matter density field with gravitational lensing. In this work we describe the methods used to assign individual weak lensing source galaxies from the DES Year 3 Weak Lensing Source Catalogue to four tomographic bins and to estimate the redshift distributions in these bins. As the first application of these methods to data, we validate that the assumptions made apply to the DES Y3 weak lensing source galaxies and develop a full treatment of systematic uncertainties. Our method consists of combining information from three independent likelihood functions: self-organizing map p(z) (sompz), a method for constraining redshifts from galaxy photometry; clustering redshifts (WZ), constraints on redshifts from cross-correlations of galaxy density functions; and shear ratios (SRs), which provide constraints on redshifts from the ratios of the galaxy-shear correlation functions at small scales. Finally, we describe how these independent probes are combined to yield an ensemble of redshift distributions encapsulating our full uncertainty. We calibrate redshifts with combined effective uncertainties of σ〈z〉 ∼ 0.01 on the mean redshift in each tomographic bin.
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