Dark Energy Survey Year 3 results: redshift calibration of the weak lensing source galaxies

Author:

Myles J123ORCID,Alarcon A456,Amon A123,Sánchez C7ORCID,Everett S8,DeRose J98,McCullough J2,Gruen D123ORCID,Bernstein G M7ORCID,Troxel M A10,Dodelson S11,Campos A11,MacCrann N12ORCID,Yin B11,Raveri M13,Amara A14,Becker M R4ORCID,Choi A15,Cordero J16,Eckert K7,Gatti M17,Giannini G17ORCID,Gschwend J1819,Gruendl R A2021,Harrison I2216ORCID,Hartley W G23,Huff E M24,Kuropatkin N25,Lin H25,Masters D26,Miquel R2717,Prat J28ORCID,Roodman A23,Rykoff E S23,Sevilla-Noarbe I29,Sheldon E30,Wechsler R H123,Yanny B25,Abbott T M C31,Aguena M3218,Allam S25,Annis J25,Bacon D14,Bertin E3334,Bhargava S35,Bridle S L16,Brooks D36,Burke D L23,Carnero Rosell A3738,Carrasco Kind M2021,Carretero J17,Castander F J65,Conselice C1639,Costanzi M4041,Crocce M65,da Costa L N1819,Pereira M E S42,Desai S43,Diehl H T25,Eifler T F4424,Elvin-Poole J1545,Evrard A E4642,Ferrero I47,Ferté A24,Flaugher B25,Fosalba P65,Frieman J2513,García-Bellido J48,Gaztanaga E65,Giannantonio T4950,Hinton S R51,Hollowood D L8,Honscheid K1545,Hoyle B525354,Huterer D42,James D J55,Krause E44,Kuehn K5657,Lahav O36,Lima M3218,Maia M A G1819,Marshall J L58,Martini P155960,Melchior P61,Menanteau F2021,Mohr J J5253,Morgan R62,Muir J2,Ogando R L C1819,Palmese A2513,Paz-Chinchón F4921,Plazas A A61,Rodriguez-Monroy M29,Samuroff S11,Sanchez E29,Scarpine V25,Secco L F7,Serrano S65,Smith M63,Soares-Santos M42,Suchyta E64,Swanson M E C21,Tarle G42,Thomas D14,To C123,Varga T N5354,Weller J5354,Wester W25

Affiliation:

1. Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA

2. Kavli Institute for Particle Astrophysics and Cosmology, PO Box 2450, Stanford University, Stanford, CA 94305, USA

3. SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA

4. Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA

5. Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans, s/n, E-08193 Barcelona, Spain

6. Institut d’Estudis Espacials de Catalunya (IEEC), E-08034 Barcelona, Spain

7. Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA

8. Santa Cruz Institute for Particle Physics, Santa Cruz, CA 95064, USA

9. Department of Astronomy, University of California, Berkeley, 501 Campbell Hall, Berkeley, CA 94720, USA

10. Department of Physics, Duke University Durham, NC 27708, USA

11. Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15312, USA

12. Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge CB3 0WA, UK

13. Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637, USA

14. Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 3FX, UK

15. Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USA

16. Jodrell Bank Center for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK

17. Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB, E-08193 Bellaterra (Barcelona) Spain

18. Laboratório Interinstitucional de e-Astronomia – LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ – 20921-400, Brazil

19. Observatório Nacional, Rua Gal. José Cristino 77, Rio de Janeiro, RJ – 20921-400, Brazil

20. Department of Astronomy, University of Illinois at Urbana-Champaign, 1002 W. Green Street, Urbana, IL 61801, USA

21. National Center for Supercomputing Applications, 1205 West Clark St., Urbana, IL 61801, USA

22. Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK

23. Département de Physique Théorique and Center for Astroparticle Physics, Université de Genève, 24 quai Ernest Ansermet, CH-1211 Geneva, Switzerland

24. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, USA

25. Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA

26. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA

27. Institució Catalana de Recerca i Estudis Avançats, E-08010 Barcelona, Spain

28. Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637, USA

29. Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), E-28040 Madrid, Spain

30. Brookhaven National Laboratory, Bldg 510, Upton, NY 11973, USA

31. Cerro Tololo Inter-American Observatory, NSF’s National Optical-Infrared Astronomy Research Laboratory, Casilla 603, La Serena, Chile

32. Departamento de Física Matemática, Instituto de Física, Universidade de São Paulo, CP 66318, São Paulo, SP, 05314-970, Brazil

33. CNRS, UMR 7095, Institut d’Astrophysique de Paris, F-75014 Paris, France

34. Sorbonne Universités, UPMC Université Paris 06, UMR 7095, Institut d’Astrophysique de Paris, F-75014 Paris, France

35. Department of Physics and Astronomy, Pevensey Building, University of Sussex, Brighton BN1 9QH, UK

36. Department of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT, UK

37. Instituto de Astrofisica de Canarias, E-38205 La Laguna, Tenerife, Spain

38. Universidad de La Laguna, Dpto. Astrofísica, E-38206 La Laguna, Tenerife, Spain

39. School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK

40. INAF – Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, I-34143 Trieste, Italy

41. Institute for Fundamental Physics of the Universe, Via Beirut 2, I-34014 Trieste, Italy

42. Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA

43. Department of Physics, IIT Hyderabad, Kandi, Telangana 502285, India

44. Department of Astronomy/Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065, USA

45. Department of Physics, The Ohio State University, Columbus, OH 43210, USA

46. Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA

47. Institute of Theoretical Astrophysics, University of Oslo, PO Box 1029 Blindern, NO-0315 Oslo, Norway

48. Instituto de Fisica Teorica UAM/CSIC, Universidad Autonoma de Madrid, E-28049 Madrid, Spain

49. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK

50. Kavli Institute for Cosmology, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK

51. School of Mathematics and Physics, University of Queensland, Brisbane, QLD 4072, Australia

52. Faculty of Physics, Ludwig-Maximilians-Universität, Scheinerstr. 1, D-81679 Munich, Germany

53. Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, D-85748 Garching, Germany

54. Universitäts-Sternwarte, Fakultät für Physik, Ludwig-Maximilians Universität München, Scheinerstr. 1, D-81679 München, Germany

55. Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA

56. Australian Astronomical Optics, Macquarie University, North Ryde, NSW 2113, Australia

57. Lowell Observatory, 1400 Mars Hill Rd, Flagstaff, AZ 86001, USA

58. Department of Physics and Astronomy, George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA

59. Department of Astronomy, The Ohio State University, Columbus, OH 43210, USA

60. Radcliffe Institute for Advanced Study, Harvard University, Cambridge, MA 02138, USA

61. Department of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, NJ 08544, USA

62. Physics Department, 2320 Chamberlin Hall, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706-1390, USA

63. School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK

64. Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, UK

Abstract

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.

Funder

Department of Energy

NSF

Brinson Foundation

Moore Foundation

U.S. Department of Energy

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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