Issue |
A&A
Volume 671, March 2023
|
|
---|---|---|
Article Number | A153 | |
Number of page(s) | 23 | |
Section | Numerical methods and codes | |
DOI | https://doi.org/10.1051/0004-6361/202245027 | |
Published online | 21 March 2023 |
The PAU Survey and Euclid: Improving broadband photometric redshifts with multi-task learning★
1
Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB,
08193
Bellaterra (Barcelona),
Spain
e-mail: lcabayol@pic.es
2
Port d’Informació Científica, Campus UAB,
C. Albareda s/n,
08193
Bellaterra (Barcelona),
Spain
3
Institute of Space Sciences (ICE, CSIC), Campus UAB,
Carrer de Can Magrans, s/n,
08193
Barcelona,
Spain
4
Institut d’Estudis Espacials de Catalunya (IEEC),
Carrer Gran Capitá 2-4,
08034
Barcelona,
Spain
5
Instituto de Física Teórica UAM-CSIC,
Campus de Cantoblanco,
28049
Madrid,
Spain
6
Ruhr University Bochum, Faculty of Physics and Astronomy, Astronomical Institute (AIRUB), German Centre for Cosmological Lensing (GCCL),
44780
Bochum,
Germany
7
Leiden Observatory, Leiden University,
Niels Bohrweg 2,
2333
CA Leiden,
The Netherlands
8
Department of Physics and Astronomy, University College London,
Gower Street,
London
WC1E 6BT,
UK
9
Institució Catalana de Recerca i Estudis Avançats (ICREA),
Passeig de Lluís Companys 23,
08010
Barcelona,
Spain
10
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT),
Avenida Complutense 40,
28040
Madrid,
Spain
11
Institut de Ciencies de l’Espai (IEEC-CSIC), Campus UAB,
Carrer de Can Magrans, s/n Cerdanyola del Valles,
08193
Barcelona,
Spain
12
Université Paris-Saclay, CNRS, Institut d'astrophysique spatiale,
91405
Orsay,
France
13
Institute of Cosmology and Gravitation, University of Portsmouth,
Portsmouth
PO1 3FX,
UK
14
INAF-Osservatorio di Astrofísica e Scienza dello Spazio di Bologna,
Via Piero Gobetti 93/3,
40129
Bologna,
Italy
15
Dipartimento di Fisica e Astronomia, Universitá di Bologna,
Via Gobetti 93/2,
40129
Bologna,
Italy
16
INFN-Sezione di Bologna,
Viale Berti Pichat 6/2,
40127
Bologna,
Italy
17
Max Planck Institute for Extraterrestrial Physics,
Giessenbachstr. 1,
85748
Garching,
Germany
18
Universitäts-Sternwarte München, Fakultät für Physik, Ludwig-Maximilians-Universität München,
Scheinerstrasse 1,
81679
München,
Germany
19
INAF-Osservatorio Astrofísico di Torino,
Via Osservatorio 20,
10025
Pino Torinese (TO),
Italy
20
Dipartimento di Fisica, Universitá degli studi di Genova, and INFN-Sezione di Genova,
via Dodecaneso 33,
16146
Genova,
Italy
21
INFN-Sezione di Roma Tre,
Via della Vasca Navale 84,
00146
Roma,
Italy
22
INAF-Osservatorio Astronomico di Capodimonte,
Via Moiariello 16,
80131
Napoli,
Italy
23
Instituto de Astrofísica e Ciencias do Espaço, Universidade do Porto, CAUP, Rua das Estrelas,
PT4150-762
Porto,
Portugal
24
Dipartimento di Fisica, Universitá degli Studi di Torino,
Via P. Giuria 1,
10125
Torino,
Italy
25
INFN-Sezione di Torino,
Via P. Giuria 1,
10125
Torino,
Italy
26
INAF-IASF Milano,
Via Alfonso Corti 12,
20133
Milano,
Italy
27
INAF-Osservatorio Astronomico di Roma,
Via Frascati 33,
00078
Monteporzio Catone,
Italy
28
INFN section of Naples,
Via Cinthia 6,
80126
Napoli,
Italy
29
Department of Physics “E. Pancini”, University Federico II,
Via Cinthia 6,
80126
Napoli,
Italy
30
Dipartimento di Fisica e Astronomia “Augusto Righi” - Alma Mater Studiorum Universitá di Bologna,
Viale Berti Pichat 6/2,
40127
Bologna,
Italy
31
INAF-Osservatorio Astrofísico di Arcetri,
Largo E. Fermi 5,
50125
Firenze,
Italy
32
Centre National d’Études Spatiales, Centre spatial de Toulouse,
18 avenue Edouard Belin,
31401
Toulouse Cedex 9,
France
33
Institut national de physique nucléaire et de physique des particules,
3 rue Michel-Ange,
75794
Paris Cedex 16,
France
34
Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill,
Edinburgh
EH9 3HJ,
UK
35
Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester,
Oxford Road,
Manchester
M13 9PL,
UK
36
ESAC/ESA,
Camino Bajo del Castillo, s/n., Urb. Villafranca del Castillo,
28692
Villanueva de la Cañada, Madrid,
Spain
37
European Space Agency/ESRIN,
Largo Galileo Galilei 1,
00044
Frascati, Roma,
Italy
38
Univ. Lyon,
Univ. Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, UMR 5822,
69622
Villeurbanne,
France
39
Observatoire de Sauverny, École Polytechnique Fédérale de Lausanne,
1290
Versoix,
Switzerland
40
Mullard Space Science Laboratory, University College London,
Holmbury St Mary,
Dorking, Surrey
RH5 6NT,
UK
41
Departamento de Física, Faculdade de Ciencias, Universidade de Lisboa,
Edifício C8, Campo Grande,
PT1749-016
Lisboa,
Portugal
42
Instituto de Astrofísica e Ciências do Espaço, Faculdade de Ciencias, Universidade de Lisboa, Campo Grande,
1749-016
Lisboa,
Portugal
43
Department of Astronomy, University of Geneva,
ch. d’Ecogia 16,
1290
Versoix,
Switzerland
44
Department of Physics, Oxford University, Keble Road,
Oxford
OX1 3RH,
UK
45
INFN-Padova,
Via Marzolo 8,
35131
Padova,
Italy
46
Université Paris-Saclay, Université Paris Cité, CEA, CNRS, Astrophysique, Instrumentation et Modélisation Paris-Saclay,
91191
Gif-sur-Yvette,
France
47
INAF-Osservatorio Astronomico di Trieste,
Via G. B. Tiepolo 11,
34143
Trieste,
Italy
48
Aix-Marseille Université, CNRS/IN2P3, CPPM,
Marseille,
France
49
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna,
Via Irnerio 46,
40126
Bologna,
Italy
50
INAF-Osservatorio Astronomico di Padova,
Via dell’Osservatorio 5,
35122
Padova,
Italy
51
Institute of Theoretical Astrophysics, University of Oslo,
PO Box 1029 Blindern,
0315
Oslo,
Norway
52
Jet Propulsion Laboratory, California Institute of Technology,
4800
Oak Grove Drive,
Pasadena, CA,
91109,
USA
53
von Hoerner & Sulger GmbH,
SchloßPlatz 8,
68723
Schwetzingen,
Germany
54
Technical University of Denmark,
Elektrovej 327,
2800
Kgs. Lyngby,
Denmark
55
Institut d’Astrophysique de Paris, UMR 7095, CNRS, and Sorbonne Université,
98 bis boulevard Arago,
75014
Paris,
France
56
Max-Planck-Institut für Astronomie,
Königstuhl 17,
69117
Heidelberg,
Germany
57
Department of Physics and Helsinki Institute of Physics,
Gustaf Hällströmin katu 2,
00014
University of Helsinki,
Finland
58
NOVA optical infrared instrumentation group at ASTRON,
Oude Hoogeveensedijk 4,
7991PD
Dwingeloo,
The Netherlands
59
Argelander-Institut für Astronomie, Universität Bonn,
Auf dem Hügel 71,
53121
Bonn,
Germany
60
Dipartimento di Fisica e Astronomia “Augusto Righi” – Alma Mater Studiorum Università di Bologna,
via Piero Gobetti 93/2,
40129
Bologna,
Italy
61
Department of Physics, Institute for Computational Cosmology, Durham University, South Road,
DH1 3LE,
UK
62
Université Paris Cité, CNRS, Astroparticule et Cosmologie,
75013
Paris,
France
63
INFN-Bologna,
Via Irnerio 46,
40126
Bologna,
Italy
64
Institute of Physics, Laboratory of Astrophysics, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny,
1290
Versoix,
Switzerland
65
European Space Agency/ESTEC,
Keplerlaan 1,
2201
AZ Noordwijk,
The Netherlands
66
Department of Physics and Astronomy, University of Aarhus,
Ny Munkegade 120,
8000
Aarhus C,
Denmark
67
Space Science Data Center, Italian Space Agency, via del Politecnico snc,
00133
Roma,
Italy
68
Institute of Space Science,
Str. Atomiştilor, nr. 409
Măgurele, Ilfov,
077125,
Romania
69
Instituto de Astrofísica de Canarias,
Calle Vía Láctea s/n,
38204,
San Cristóbal de La Laguna, Tenerife,
Spain
70
Departamento de Astrofísica, Universidad de La Laguna,
38206,
La Laguna, Tenerife,
Spain
71
Dipartimento di Fisica e Astronomia “G.Galilei”, Universitá di Padova,
Via Marzolo 8,
35131
Padova,
Italy
72
Instituto de Astrofísica e Ciências do Espaço, Faculdade de Ciências, Universidade de Lisboa, Tapada da Ajuda,
1349-018
Lisboa,
Portugal
73
Universidad Politécnica de Cartagena, Departamento de Electrónica y Tecnología de Computadoras,
30202
Cartagena,
Spain
74
Université de Genève, Département de Physique Théorique and Centre for Astroparticle Physics,
24 quai Ernest-Ansermet,
1211
Genève 4,
Switzerland
75
Kapteyn Astronomical Institute, University of Groningen,
PO Box 800,
9700
AV Groningen,
The Netherlands
76
Infrared Processing and Analysis Center, California Institute of Technology,
Pasadena,
CA 91125,
USA
77
INAF-Osservatorio Astronomico di Brera,
Via Brera 28,
20122
Milano,
Italy
78
Junia, EPA department,
41 Bd Vauban,
59000
Lille,
France
Received:
21
September
2022
Accepted:
13
January
2023
Current and future imaging surveys require photometric redshifts (photo-zs) to be estimated for millions of galaxies. Improving the photo-z quality is a major challenge but is needed to advance our understanding of cosmology. In this paper we explore how the synergies between narrow-band photometric data and large imaging surveys can be exploited to improve broadband photometric redshifts. We used a multi-task learning (MTL) network to improve broadband photo-z estimates by simultaneously predicting the broadband photo-z and the narrow-band photometry from the broadband photometry. The narrow-band photometry is only required in the training field, which also enables better photo-z predictions for the galaxies without narrow-band photometry in the wide field. This technique was tested with data from the Physics of the Accelerating Universe Survey (PAUS) in the COSMOS field. We find that the method predicts photo-zs that are 13% more precise down to magnitude iAB < 23; the outlier rate is also 40% lower when compared to the baseline network. Furthermore, MTL reduces the photo-z bias for high-redshift galaxies, improving the redshift distributions for tomographic bins with z > 1. Applying this technique to deeper samples is crucial for future surveys such as Euclid or LSST. For simulated data, training on a sample with iAB < 23, the method reduces the photo-z scatter by 16% for all galaxies with iAB < 25. We also studied the effects of extending the training sample with photometric galaxies using PAUS high-precision photo-zs, which reduces the photo-z scatter by 20% in the COSMOS field.
Key words: surveys / methods: data analysis / techniques: image processing / techniques: photometric / methods: observational
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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