Euclid: Constraining ensemble photometric redshift distributions with stacked spectroscopy

Astronomy and Astrophysics, vol. 660, pp. A9

Abstract

Context. The ESA Euclid mission will produce photometric galaxy samples over 15 000 square degrees of the sky that will be rich for clustering and weak lensing statistics. The accuracy of the cosmological constraints derived from these measurements will depend on the knowledge of the underlying redshift distributions based on photometric redshift calibrations. Aims. A new approach is proposed to use the stacked spectra from Euclid slitless spectroscopy to augment broad-band photometric information to constrain the redshift distribution with spectral energy distribution fitting. The high spectral resolution available in the stacked spectra complements the photometry and helps to break the colour-redshift degeneracy and constrain the redshift distribution of galaxy samples. Methods. We modelled the stacked spectra as a linear mixture of spectral templates. The mixture may be inverted to infer the underlying redshift distribution using constrained regression algorithms. We demonstrate the method on simulated Vera C. Rubin Observatory and Euclid mock survey data sets based on the Euclid Flagship mock galaxy catalogue. We assess the accuracy of the reconstruction by considering the inference of the baryon acoustic scale from angular two-point correlation function measurements. Results. We selected mock photometric galaxy samples at redshift z > 1 using the self-organising map algorithm. Considering the idealised case without dust attenuation, we find that the redshift distributions of these samples can be recovered with 0.5% accuracy on the baryon acoustic scale. The estimates are not significantly degraded by the spectroscopic measurement noise due to the large sample size. However, the error degrades to 2% when the dust attenuation model is left free. We find that the colour degeneracies introduced by attenuation limit the accuracy considering the wavelength coverage of Euclid near-infrared spectroscopy.

Authors 98

1. M. S. Cagliari

   University of Milan

   Affiliation as printed

   Dipartimento di Fisica “Aldo Pontremoli", Universitá degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy

2. B. R. Granett

   Brera Astronomical Observatory

   Affiliation as printed

   INAF-Osservatorio Astronomico di Brera, Via Brera 28, 20122 Milano, Italy

3. L. Guzzo

   University of Milan · Brera Astronomical Observatory · Istituto Nazionale di Fisica Nucleare, Sezione di Milano

   Affiliation as printed

   Dipartimento di Fisica “Aldo Pontremoli", Universitá degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy

   INAF-Osservatorio Astronomico di Brera, Via Brera 28, 20122 Milano, Italy

   INFN-Sezione di Milano, Via Celoria 16, 20133 Milano, Italy

4. M. Bolzonella

   Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics

   Affiliation as printed

   INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy

5. Lucia Pozzetti

   Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics

   Affiliation as printed

   INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy

6. Isaac Tutusaus

   Institute of Space Sciences · Institut d'Estudis Espacials de Catalunya

   Affiliation as printed

   Institut d’Estudis Espacials de Catalunya (IEEC), Carrer Gran Capitá 2-4, 08034 Barcelona, Spain

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

7. S. Camera

   Istituto Nazionale di Fisica Nucleare, Sezione di Torino · Osservatorio Astrofisico di Torino · University of Turin

   Affiliation as printed

   Dipartimento di Fisica, Universitá degli Studi di Torino, Via P. Giuria 1, 10125 Torino, Italy

   INAF-Osservatorio Astrofisico di Torino, Via Osservatorio 20, 10025 Pino Torinese, TO, Italy

   INFN-Sezione di Torino, Via P. Giuria 1, 10125 Torino, Italy

8. Adam Amara

   University of Portsmouth

   Affiliation as printed

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

9. N. Auricchio

   Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics

   Affiliation as printed

   INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy

10. Ralf Bender

    Max Planck Institute for Extraterrestrial Physics · Ludwig-Maximilians-Universität München

    Affiliation as printed

    Max Planck Institute for Extraterrestrial Physics, Giessenbachstr. 1, 85748 Garching, Germany

    Universitäts-Sternwarte München, Fakultät für Physik, Ludwig-Maximilians-Universität München, Scheinerstrasse 1, 81679 München, Germany

11. Christof T. Bodendorf

    Max Planck Institute for Extraterrestrial Physics

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    Max Planck Institute for Extraterrestrial Physics, Giessenbachstr. 1, 85748 Garching, Germany

12. D. Bonino

    Osservatorio Astrofisico di Torino

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    INAF-Osservatorio Astrofisico di Torino, Via Osservatorio 20, 10025 Pino Torinese, TO, Italy

13. E. Branchini

    Roma Tre University · Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre

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    Department of Mathematics and Physics, Roma Tre University, Via della Vasca Navale 84, 00146 Rome, Italy

    INFN-Sezione di Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy

14. M. Brescia

    Astronomical Observatory of Capodimonte

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    INAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy

15. V. Capobianco

    Osservatorio Astrofisico di Torino

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    INAF-Osservatorio Astrofisico di Torino, Via Osservatorio 20, 10025 Pino Torinese, TO, Italy

16. C. Carbone

    National Institute for Astrophysics

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    INAF-IASF Milano, Via Alfonso Corti 12, 20133 Milano, Italy

17. J. Carretero

    Institute for High Energy Physics · Barcelona Institute of Science and Technology

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

18. Francisco Javier Castander

    Institute of Space Sciences · Institut d'Estudis Espacials de Catalunya

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    Institut d’Estudis Espacials de Catalunya (IEEC), Carrer Gran Capitá 2-4, 08034 Barcelona, Spain

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    Astronomical Observatory of Rome · National Institute for Astrophysics

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20. S. Cavuoti

    Astronomical Observatory of Capodimonte · Istituto Nazionale di Fisica Nucleare, Sezione di Napoli · University of Naples Federico II

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    Department of Physics “E. Pancini”, University Federico II, Via Cinthia 6, 80126 Napoli, Italy

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21. A. Cimatti

    Arcetri Astrophysical Observatory · University of Bologna

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    Centre National d'Études Spatiales · Institut National de Physique Nucléaire et de Physique des Particules

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    Royal Observatory · University of Edinburgh

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    Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK

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    University of Manchester

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    Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK

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    European Space Agency · European Space Astronomy Centre · European Space Research Institute

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    Lyon 1 Université · Centre National de la Recherche Scientifique · Institut de Physique des 2 Infinis de Lyon

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27. L. Corcione

    Osservatorio Astrofisico di Torino

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28. Mark S. Cropper

    University College London

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    University of Geneva

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    Centre National de la Recherche Scientifique · Université Paris-Saclay · Institut d'Astrophysique Spatiale

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31. F. Dubath

    University of Geneva

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    Osservatorio Astronomico di Padova

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34. S. Ferriol

    Lyon 1 Université · Centre National de la Recherche Scientifique · Institut de Physique des 2 Infinis de Lyon

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    Lyon 1 Université · Centre National de la Recherche Scientifique · Institut National de Physique Nucléaire et de Physique des Particules · Institut de Physique des 2 Infinis de Lyon

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    University of Lyon, UCB Lyon 1, CNRS/IN2P3, IUF, IP2I Lyon, France

36. M. Frailis

    Trieste Astronomical Observatory

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    INAF-Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, 34131 Trieste, Italy

37. Enrico Franceschi

    Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics

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    INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy

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    National Institute for Astrophysics

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    National Institute for Astrophysics

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    Osservatorio Astronomico di Padova

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    Max Planck Institute for Extraterrestrial Physics · Ludwig-Maximilians-Universität München

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43. S. V. H. Haugan

    University of Oslo

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44. Henk Hoekstra Aachen Leiden Observatory

    Leiden University · Leiden Observatory

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    Leiden Observatory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands

45. W. A. Holmes

    Jet Propulsion Laboratory

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46. F. Hormuth

    Max Planck Institute for Astronomy · von Hoerner & Sulger (Germany)

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    Institut d'Astrophysique de Paris

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    Max Planck Institute for Astronomy

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    Centre National de la Recherche Scientifique · Aix-Marseille Université · Centre de physique des particules de Marseille · Institut National de Physique Nucléaire et de Physique des Particules

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    AIM, CEA, CNRS, Université Paris-Saclay, Université de Paris, 91191 Gif-sur-Yvette, France

52. T. Kitching

    University College London

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53. M Kümmel

    Ludwig-Maximilians-Universität München

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54. Martin Kunz

    University of Geneva

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    Université de Genève, Département de Physique Théorique and Centre for Astroparticle Physics, 24 quai Ernest-Ansermet, 1211 Genève 4, Switzerland

55. Hannu Kurki-Suonio

    University of Helsinki · Helsinki Institute of Physics

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    Department of Physics and Helsinki Institute of Physics, Gustaf Hällströmin katu 2, 00014 University of Helsinki, Finland

56. S. Ligori

    Osservatorio Astrofisico di Torino

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    INAF-Osservatorio Astrofisico di Torino, Via Osservatorio 20, 10025 Pino Torinese, TO, Italy

57. Per Barth Lilje

    University of Oslo

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58. Ivan Lloro

    Netherlands Institute for Radio Astronomy

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59. E. Maiorano

    Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics

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    INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy

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    Trieste Astronomical Observatory

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    University of Bonn

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    Jet Propulsion Laboratory

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    Durham University

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

64. Massimo Meneghetti

    California Institute of Technology · Istituto Nazionale di Fisica Nucleare, Sezione di Bologna · Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics

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65. E. Merlin

    Astronomical Observatory of Rome · National Institute for Astrophysics

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    École Polytechnique Fédérale de Lausanne

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67. M. Moresco

    Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics · University of Bologna

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    Istituto Nazionale di Fisica Nucleare, Sezione di Bologna · Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics · University of Bologna

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69. S. -M. Niemi

    European Space Agency · European Space Research and Technology Centre

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70. S. Paltani

    University of Geneva

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    Trieste Astronomical Observatory

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    Aarhus University

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    University of Waterloo · Perimeter Institute

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    Centre National d'Études Spatiales

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    Max Planck Institute for Extraterrestrial Physics

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    Universidad de La Laguna · Instituto de Astrofísica de Canarias

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    Jet Propulsion Laboratory

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    Max Planck Institute for Astronomy

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    Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics · University of Bologna

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    University of Bologna

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    Astronomical Observatory of Rome · Istituto Nazionale di Fisica Nucleare, Sezione di Roma I · National Institute for Astrophysics

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    University of Bonn

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    National Institute for Astrophysics

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    Max Planck Institute for Astronomy

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91. C. Sirignano

    University of Padua · Istituto Nazionale di Fisica Nucleare, Sezione di Padova

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92. Gabriele Sirri

    Istituto Nazionale di Fisica Nucleare, Sezione di Bologna

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93. Daniele Tavagnacco

    Trieste Astronomical Observatory

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94. Ismael Tereno

    University of Lisbon · Institute of Astrophysics and Space Sciences

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95. R. Toledo-Moreo

    Universidad Politécnica de Cartagena

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96. Edwin A. Valentijn

    University of Groningen

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97. Luca Valenziano

    Istituto Nazionale di Fisica Nucleare, Sezione di Bologna · Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics

    Affiliation as printed

    INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy

    INFN-Sezione di Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy

98. Yun Wang

    California Institute of Technology · Infrared Processing and Analysis Center

    Affiliation as printed

    Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125, USA