Issue |
A&A
Volume 660, April 2022
|
|
---|---|---|
Article Number | A9 | |
Number of page(s) | 16 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361/202142224 | |
Published online | 30 March 2022 |
Euclid: Constraining ensemble photometric redshift distributions with stacked spectroscopy⋆
1
Dipartimento di Fisica “Aldo Pontremoli", Universitá degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy
e-mail: marina.cagliari@unimi.it
2
INAF-Osservatorio Astronomico di Brera, Via Brera 28, 20122 Milano, Italy
3
INFN-Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
4
INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy
5
Institut d’Estudis Espacials de Catalunya (IEEC), Carrer Gran Capitá 2-4, 08034 Barcelona, Spain
6
Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans, s/n, 08193 Barcelona, Spain
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
INFN-Sezione di Torino, Via P. Giuria 1, 10125 Torino, Italy
10
Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 3FX, UK
11
Max Planck Institute for Extraterrestrial Physics, Giessenbachstr. 1, 85748 Garching, Germany
12
Universitäts-Sternwarte München, Fakultät für Physik, Ludwig-Maximilians-Universität München, Scheinerstrasse 1, 81679 München, Germany
13
Department of Mathematics and Physics, Roma Tre University, Via della Vasca Navale 84, 00146 Rome, Italy
14
INFN-Sezione di Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy
15
INAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy
16
INAF-IASF Milano, Via Alfonso Corti 12, 20133 Milano, Italy
17
Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB, 08193 Bellaterra, Barcelona, Spain
18
INAF-Osservatorio Astronomico di Roma, Via Frascati 33, 00078 Monteporzio Catone, Italy
19
Department of Physics “E. Pancini”, University Federico II, Via Cinthia 6, 80126 Napoli, Italy
20
INFN section of Naples, Via Cinthia 6, 80126 Napoli, Italy
21
Dipartimento di Fisica e Astronomia “Augusto Righi” – Alma Mater Studiorum Universitá di Bologna, via Piero Gobetti 93/2, 40129 Bologna, Italy
22
INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
23
Centre National d’Etudes Spatiales, Toulouse, France
24
Institut national de physique nucléaire et de physique des particules, 3 rue Michel-Ange, 75794 Paris Cedex 16, France
25
Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
26
Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK
27
European Space Agency/ESRIN, Largo Galileo Galilei 1, 00044 Frascati, Roma, Italy
28
ESAC/ESA, Camino Bajo del Castillo, s/n., Urb. Villafranca del Castillo, 28692 Villanueva de la Cañada, Madrid, Spain
29
Univ Lyon, Univ Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, UMR 5822, 69622 Villeurbanne, France
30
Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UK
31
Department of Astronomy, University of Geneva, ch. dÉcogia 16, 1290 Versoix, Switzerland
32
Université Paris-Saclay, CNRS, Institut d’astrophysique spatiale, 91405 Orsay, France
33
INAF-Osservatorio Astronomico di Padova, Via dell’Osservatorio 5, 35122 Padova, Italy
34
University of Lyon, UCB Lyon 1, CNRS/IN2P3, IUF, IP2I Lyon, France
35
INAF-Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, 34131 Trieste, Italy
36
Istituto Nazionale di Astrofisica (INAF) – Osservatorio di Astrofisica e Scienza dello Spazio (OAS), Via Gobetti 93/3, 40127 Bologna, Italy
37
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, Via Irnerio 46, 40126 Bologna, Italy
38
Institute of Theoretical Astrophysics, University of Oslo, PO Box 1029 Blindern, 0315 Oslo, Norway
39
Leiden Observatory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands
40
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
41
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
42
von Hoerner & Sulger GmbH, SchlossPlatz 8, 68723 Schwetzingen, Germany
43
Institut d’Astrophysique de Paris, 98bis boulevard Arago, 75014 Paris, France
44
Aix-Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
45
AIM, CEA, CNRS, Université Paris-Saclay, Université de Paris, 91191 Gif-sur-Yvette, France
46
Université de Genève, Département de Physique Théorique and Centre for Astroparticle Physics, 24 quai Ernest-Ansermet, 1211 Genève 4, Switzerland
47
Department of Physics and Helsinki Institute of Physics, Gustaf Hällströmin katu 2, 00014 University of Helsinki, Finland
48
NOVA optical infrared instrumentation group at ASTRON, Oude Hoogeveensedijk 4, 7991PD Dwingeloo, The Netherlands
49
Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
50
Institute for Computational Cosmology, Department of Physics, Durham University, South Road, Durham DH1 3LE, UK
51
INFN-Sezione di Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy
52
California institute of Technology, 1200 E California Blvd, Pasadena, CA 91125, USA
53
Observatoire de Sauverny, Ecole Polytechnique Fédérale de Lau- sanne, 1290 Versoix, Switzerland
54
European Space Agency/ESTEC, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands
55
Department of Physics and Astronomy, University of Aarhus, Ny Munkegade 120, 8000 Aarhus C, Denmark
56
Centre for Astrophysics, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
57
Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
58
Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 2Y5, Canada
59
Institute of Space Science, Bucharest 077125, Romania
60
Departamento de Astrofísica, Universidad de La Laguna, 38206 La Laguna, Tenerife, Spain
61
Instituto de Astrofísica de Canarias, Calle Vía Láctea s/n, 38204 San Cristóbal de La Laguna, Tenerife, Spain
62
INFN-Sezione di Roma, Piazzale Aldo Moro, 2 – c/o Dipartimento di Fisica, Edificio G. Marconi, 00185 Roma, Italy
63
Dipartimento di Fisica e Astronomia “G. Galilei”, Universitá di Padova, Via Marzolo 8, 35131 Padova, Italy
64
INFN-Padova, Via Marzolo 8, 35131 Padova, Italy
65
Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, Edifício C8, Campo Grande, 1749-016 Lisboa, Portugal
66
Instituto de Astrofísica e Ciências do Espaço, Faculdade de Ciências, Universidade de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal
67
Universidad Politécnica de Cartagena, Departamento de Electrónica y Tecnología de Computadoras, 30202 Cartagena, Spain
68
Kapteyn Astronomical Institute, University of Groningen, PO Box 800 9700 AV Groningen, The Netherlands
69
Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125, USA
70
INAF-IASF Bologna, Via Piero Gobetti 101, 40129 Bologna, Italy
71
Université de Paris, CNRS, Astroparticule et Cosmologie, 75013 Paris, France
72
Space Science Data Center, Italian Space Agency, via del Politecnico snc, 00133 Roma, Italy
73
Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal
Received:
15
September
2021
Accepted:
18
January
2022
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.
Key words: methods: data analysis / methods: statistical / galaxies: distances and redshifts / large-scale structure of Universe
© ESO 2022
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.