DESI complete calibration of the colour–redshift relation (DC3R2): results from early DESI data

Author:

McCullough J123ORCID,Gruen D34ORCID,Amon A56,Roodman A12,Masters D7,Raichoor A8ORCID,Schlegel D8,Canning R9,Castander F J1011ORCID,DeRose J8,Miquel R1213,Myles J12ORCID,Newman J A14,Slosar A15,Speagle J16,Wilson M J17,Aguilar J8,Ahlen S18,Bailey S8,Brooks D19,Claybaugh T8,Cole S17,Dawson K20,de la Macorra A21,Doel P19,Forero-Romero J E22ORCID,Gontcho A Gontcho S8ORCID,Guy J8,Kehoe R23,Kremin A8,Landriau M8,Le Guillou L24,Levi M8,Manera M13,Martini P25,Meisner A26ORCID,Moustakas J27,Nie J28,Percival W J29ORCID,Poppett C830,Prada F31,Rezaie M32ORCID,Rossi G33,Sanchez E34ORCID,Seo H35ORCID,Tarlé G36,Weaver B A26,Zhou Z28,Zou H28,

Affiliation:

1. Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics, Stanford University , Stanford, CA 94305 , USA

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

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

4. Excellence Cluster ORIGINS , Boltzmannstrasse 2, D-85748 Garching , Germany

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

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

7. Infrared Processing and Analysis Center, California Institute of Technology , 1200 E California Blvd, Pasadena, CA 91125 , USA

8. Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720 , USA

9. Institute of Cosmology and Gravitation, Faculty of Technology, University of Portsmouth, Dennis Sciama Building , Portsmouth PO1 3FX , UK

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

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

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

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

14. Department of Physics and Astronomy and PITT PACC, University of Pittsburgh , Pittsburgh, PA 15260 , USA

15. Brookhaven National Laboratory , Upton, NY 11973 , USA

16. Dunlap Institute for Astronomy and Astrophysics, University of Toronto , Toronto M5S 3H4 , Canada

17. Institute for Computational Cosmology, Department of Physics, Durham University , South Road, Durham DH1 3LE , UK

18. Physics Dept., Boston University , 590 Commonwealth Avenue, Boston, MA 02215 , USA

19. Department of Physics and Astronomy, University College London , Gower Street, London WC1E 6BT , UK

20. Department of Physics and Astronomy, The University of Utah , 115 South 1400 East, Salt Lake City, UT 84112 , USA

21. Instituto de Física, Universidad Nacional Autónoma de México , Cd. de México C.P. 04510 , México

22. Departamento de Física, Universidad de los Andes , Cra. 1 No. 18A-10, Edificio Ip, CP 111711 Bogotá , Colombia

23. Department of Physics, Southern Methodist University , 3215 Daniel Avenue, Dallas, TX 75275 , USA

24. Sorbonne Université, CNRS/IN2P3, Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE) , F-75005 Paris , France

25. Center for Cosmology and AstroParticle Physics, The Ohio State University , 191 West Woodruff Avenue, Columbus, OH 43210 , USA

26. NSF’s NOIRLab , 950 N. Cherry Ave., Tucson, AZ 85719 , USA

27. Department of Physics and Astronomy, Siena College , 515 Loudon Road, Loudonville, NY 12211 , USA

28. National Astronomical Observatories, Chinese Academy of Sciences , A20 Datun Rd., Chaoyang District, Beijing 100012 , P. R. China

29. Department of Physics and Astronomy, University of Waterloo , 200 University Ave W, Waterloo, ON N2L 3G1 , Canada

30. Space Sciences Laboratory, University of California , Berkeley, 7 Gauss Way, Berkeley, CA 94720 , USA

31. Instituto de Astrofísica de Andalucía (CSIC) , Glorieta de la Astronomía, s/n, E-18008 Granada , Spain

32. Department of Physics, Kansas State University , 116 Cardwell Hall, Manhattan, KS 66506 , USA

33. Department of Physics and Astronomy, Sejong University , Seoul 143–747 , Korea

34. CIEMAT , Avenida Complutense 40, E-28040 Madrid , Spain

35. Department of Physics and Astronomy, Ohio University , Athens, OH 45701 , USA

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

Abstract

ABSTRACT We present initial results from the Dark Energy Spectroscopic Instrument (DESI) complete calibration of the colour–redshift relation (DC3R2) secondary target survey. Our analysis uses 230 k galaxies that overlap with KiDS-VIKING ugriZYJHKs photometry to calibrate the colour–redshift relation and to inform photometric redshift (photo-z) inference methods of future weak lensing surveys. Together with emission line galaxies (ELGs), luminous red galaxies (LRGs), and the Bright Galaxy Survey (BGS) that provide samples of complementary colour, the DC3R2 targets help DESI to span 56 per cent of the colour space visible to Euclid and LSST with high confidence spectroscopic redshifts. The effects of spectroscopic completeness and quality are explored, as well as systematic uncertainties introduced with the use of common Self-Organizing Maps trained on different photometry than the analysis sample. We further examine the dependence of redshift on magnitude at fixed colour, important for the use of bright galaxy spectra to calibrate redshifts in a fainter photometric galaxy sample. We find that noise in the KiDS-VIKING photometry introduces a dominant, apparent magnitude dependence of redshift at fixed colour, which indicates a need for carefully chosen deep drilling fields, and survey simulation to model this effect for future weak lensing surveys.

Funder

Bayerisch-Kalifornischen Hochschulzentrum

Deutsche Forschungsgemeinschaft

Publisher

Oxford University Press (OUP)

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