Issue |
A&A
Volume 655, November 2021
|
|
---|---|---|
Article Number | A44 | |
Number of page(s) | 21 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361/202141061 | |
Published online | 11 November 2021 |
Euclid preparation
XII. Optimizing the photometric sample of the Euclid survey for galaxy clustering and galaxy-galaxy lensing analyses
1
Institut de Ciencies de l’Espai (IEEC-CSIC), Campus UAB, Carrer de Can Magrans, s/n Cerdanyola del Vallés, 08193 Barcelona, Spain
e-mail: pocino@ice.csic.es
2
Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans, s/n, 08193 Barcelona, Spain
3
Institut d’Estudis Espacials de Catalunya (IEEC), Carrer Gran Capitá 2-4, 08034 Barcelona, Spain
4
Department of Physics, The Ohio State University, Columbus, OH 43210, USA
5
Center for Cosmology and AstroParticle Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, OH 43210, USA
6
INFN-Sezione di Torino, Via P. Giuria 1, 10125 Torino, Italy
7
Dipartimento di Fisica, Universitá degli Studi di Torino, Via P. Giuria 1, 10125 Torino, Italy
8
INAF-Osservatorio Astrofisico di Torino, Via Osservatorio 20, 10025 Pino Torinese (TO), Italy
9
INAF-Osservatorio Astronomico di Roma, Via Frascati 33, 00078 Monteporzio Catone, Italy
10
AIM, CEA, CNRS, Université Paris-Saclay, Université de Paris, 91191 Gif-sur-Yvette, France
11
Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UK
12
Université Paris-Saclay, CNRS, Institut d’astrophysique spatiale, 91405 Orsay, France
13
Instituto de Física Téorica UAM-CSIC, Campus de Cantoblanco, 28049 Madrid, Spain
14
School of Physics and Astronomy, Queen Mary University of London, Mile End Road, London E1 4NS, UK
15
Université St Joseph; UR EGFEM, Faculty of Sciences, Beirut, Lebanon
16
Institut de Recherche en Astrophysique et Planétologie (IRAP), Université de Toulouse, CNRS, UPS, CNES, 14 Av. Edouard Belin, 31400 Toulouse, France
17
INAF-Osservatorio Astronomico di Brera, Via Brera 28, 20122 Milano, Italy
18
Istituto Nazionale di Astrofisica (INAF) – Osservatorio di Astrofisica e Scienza dello Spazio (OAS), Via Gobetti 93/3, 40127 Bologna, Italy
19
IFPU, Institute for Fundamental Physics of the Universe, via Beirut 2, 34151 Trieste, Italy
20
SISSA, International School for Advanced Studies, Via Bonomea 265, 34136 Trieste TS, Italy
21
INFN, Sezione di Trieste, Via Valerio 2, 34127 Trieste TS, Italy
22
INAF-Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, 34131 Trieste, Italy
23
Universidad de la Laguna, 38206 San Cristóbal de La Laguna, Tenerife, Spain
24
Instituto de Astrofísica de Canarias, Calle Vía Làctea s/n, 38204 San Cristóbal de la Laguna, Tenerife, Spain
25
INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy
26
Dipartimento di Fisica e Astronomia, Universitá di Bologna, Via Gobetti 93/2, 40129 Bologna, Italy
27
INFN-Sezione di Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy
28
INAF-Osservatorio Astronomico di Padova, Via dell’Osservatorio 5, 35122 Padova, Italy
29
Universitäts-Sternwarte München, Fakultät für Physik, Ludwig-Maximilians-Universität München, Scheinerstrasse 1, 81679 München, Germany
30
Max Planck Institute for Extraterrestrial Physics, Giessenbachstr. 1, 85748 Garching, Germany
31
Université de Paris, CNRS, Astroparticule et Cosmologie, 75006 Paris, France
32
Department of Astronomy, University of Geneva, ch. d’Ecogia 16, 1290 Versoix, Switzerland
33
INFN-Sezione di Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy
34
Department of Mathematics and Physics, Roma Tre University, Via della Vasca Navale 84, 00146 Rome, Italy
35
INAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy
36
Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
37
Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal
38
INFN-Bologna, Via Irnerio 46, 40126 Bologna, Italy
39
Dipartimento di Fisica e Scienze della Terra, Universitá degli Studi di Ferrara, Via Giuseppe Saragat 1, 44122 Ferrara, Italy
40
INAF, Istituto di Radioastronomia, Via Piero Gobetti 101, 40129 Bologna, Italy
41
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, Bd de l’Observatoire, CS 34229, 06304 Nice cedex 4, France
42
Instituto de Astrofísica e Ciências do Espaço, Faculdade de Ciências, Universidade de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal
43
Observatoire de Sauverny, Ecole Polytechnique Fédérale de Lau- sanne, 1290 Versoix, Switzerland
44
Department of Physics “E. Pancini”, University Federico II, Via Cinthia 6, 80126 Napoli, Italy
45
INFN section of Naples, Via Cinthia 6, 80126 Napoli, Italy
46
INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
47
Centre National d’Etudes Spatiales, Toulouse, France
48
Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
49
Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK
50
European Space Agency/ESRIN, Largo Galileo Galilei 1, 00044 Frascati, Roma, Italy
51
ESAC/ESA, Camino Bajo del Castillo, s/n., Urb. Villafranca del Castillo, 28692 Villanueva de la Cañada, Madrid, Spain
52
Univ Lyon, Univ Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, UMR 5822, 69622 Villeurbanne, France
53
Aix-Marseille Univ, CNRS, CNES, LAM, Marseille, France
54
University of Lyon, UCB Lyon 1, CNRS/IN2P3, IUF, IP2I, Lyon, France
55
Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, Edifício C8, Campo Grande, 1749-016 Lisboa, Portugal
56
Instituto de Astrofísica e Ciências do Espaço, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
57
Department of Physics, Oxford University, Keble Road, Oxford OX1 3RH, UK
58
INFN-Padova, Via Marzolo 8, 35131 Padova, Italy
59
Institute of Theoretical Astrophysics, University of Oslo, PO Box 1029 Blindern 0315 Oslo, Norway
60
School of Physics, HH Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK
61
INAF-IASF Milano, Via Alfonso Corti 12, 20133 Milano, Italy
62
Aix-Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
63
Department of Physics, PO Box 64 00014 University of Helsinki, Finland
64
Dipartimento di Fisica “Aldo Pontremoli”, Universitá degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy
65
INFN-Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
66
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
67
von Hoerner & Sulger GmbH, SchloßPlatz 8, 68723 Schwetzingen, Germany
68
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
69
Department of Physics and Helsinki Institute of Physics, Gustaf Hällströmin katu 2, 00014 University of Helsinki, Finland
70
Université de Genève, Département de Physique Théorique and Centre for Astroparticle Physics, 24 quai Ernest-Ansermet, 1211 Genève 4, Switzerland
71
NOVA optical infrared instrumentation group at ASTRON, Oude Hoogeveensedijk 4, 7991PD Dwingeloo, The Netherlands
72
Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
73
Institute for Computational Cosmology, Department of Physics, Durham University, South Road, Durham DH1 3LE, UK
74
Université de Paris, 75013 Paris, France
75
LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Université, 75014 Paris, France
76
California institute of Technology, 1200 E California Blvd, Pasadena, CA 91125, USA
77
INAF-IASF Bologna, Via Piero Gobetti 101, 40129 Bologna, Italy
78
Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB, 08193 Bellaterra (Barcelona), Spain
79
Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 3FX, UK
80
European Space Agency/ESTEC, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands
81
ICC&CEA, Department of Physics, Durham University, South Road, Durham DH1 3LE, UK
82
Department of Physics and Astronomy, University of Aarhus, Ny Munkegade 120, 8000 Aarhus C, Denmark
83
Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 2Y5, Canada
84
Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
85
Centre for Astrophysics, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
86
Space Science Data Center, Italian Space Agency, via del Politecnico snc, 00133 Roma, Italy
87
Institute of Space Science, Bucharest 077125, Romania
88
Institute for Computational Science, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
89
Dipartimento di Fisica e Astronomia “G.Galilei”, Universitá di Padova, Via Marzolo 8, 35131 Padova, Italy
90
Departamento de Física, FCFM, Universidad de Chile, Blanco Encalada 2008, Santiago, Chile
91
INFN-Sezione di Roma, Piazzale Aldo Moro, 2 – c/o Dipartimento di Fisica, Edificio G. Marconi, 00185 Roma, Italy
92
Institut d’Astrophysique de Paris, 98bis Boulevard Arago, 75014 Paris, France
93
Universidad Politécnica de Cartagena, Departamento de Electrónica y Tecnología de Computadoras, 30202 Cartagena, Spain
94
Kapteyn Astronomical Institute, University of Groningen, PO Box 800 9700 AV Groningen, The Netherlands
95
Department of Physics, PO Box 35 (YFL) 40014 University of Jyväskylä, Finland
96
Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125, USA
97
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
Received:
12
April
2021
Accepted:
5
July
2021
Photometric redshifts (photo-zs) are one of the main ingredients in the analysis of cosmological probes. Their accuracy particularly affects the results of the analyses of galaxy clustering with photometrically selected galaxies (GCph) and weak lensing. In the next decade, space missions such as Euclid will collect precise and accurate photometric measurements for millions of galaxies. These data should be complemented with upcoming ground-based observations to derive precise and accurate photo-zs. In this article we explore how the tomographic redshift binning and depth of ground-based observations will affect the cosmological constraints expected from the Euclid mission. We focus on GCph and extend the study to include galaxy-galaxy lensing (GGL). We add a layer of complexity to the analysis by simulating several realistic photo-z distributions based on the Euclid Consortium Flagship simulation and using a machine learning photo-z algorithm. We then use the Fisher matrix formalism together with these galaxy samples to study the cosmological constraining power as a function of redshift binning, survey depth, and photo-z accuracy. We find that bins with an equal width in redshift provide a higher figure of merit (FoM) than equipopulated bins and that increasing the number of redshift bins from ten to 13 improves the FoM by 35% and 15% for GCph and its combination with GGL, respectively. For GCph, an increase in the survey depth provides a higher FoM. However, when we include faint galaxies beyond the limit of the spectroscopic training data, the resulting FoM decreases because of the spurious photo-zs. When combining GCph and GGL, the number density of the sample, which is set by the survey depth, is the main factor driving the variations in the FoM. Adding galaxies at faint magnitudes and high redshift increases the FoM, even when they are beyond the spectroscopic limit, since the number density increase compensates for the photo-z degradation in this case. We conclude that there is more information that can be extracted beyond the nominal ten tomographic redshift bins of Euclid and that we should be cautious when adding faint galaxies into our sample since they can degrade the cosmological constraints.
Key words: galaxies: distances and redshifts / techniques: photometric / cosmological parameters / surveys
© ESO 2021
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