A Caltech Library Service

Euclid: the selection of quiescent and star-forming galaxies using observed colours

Bisigello, L. and Kuchner, U. and Conselice, C. J. and Andreon, S. and Bolzonella, M. and Duc, P.-A. and Garilli, B. and Humphrey, A. and Maraston, C. and Moresco, M. and Pozzetti, L. and Tortora, C. and Zamorani, G. and Auricchio, N. and Brinchmann, J. and Capobianco, V. and Carretero, J. and Castander, F. J. and Castellano, M. and Cavuoti, S. and Cimatti, A. and Cledassou, R. and Congedo, G. and Conversi, L. and Corcione, L. and Cropper, M. S. and Dusini, S. and Frailis, M. and Franceschi, E. and Franzetti, P. and Fumana, M. and Hormuth, F. and Israel, H. and Jahnke, K. and Kermiche, S. and Kitching, T. and Kohley, R. and Kubik, B. and Kunz, M. and Le Fèvre, O. and Ligori, S. and Lilje, P. B. and Lloro, I. and Maiorano, E. and Marggraf, O. and Massey, R. and Masters, D. C. and Mei, S. and Mellier, Y. and Meylan, G. and Padilla, C. and Paltani, S. and Pasian, F. and Pettorino, V. and Pires, S. and Polenta, G. and Poncet, M. and Raison, F. and Rhodes, J. and Roncarelli, M. and Rossetti, E. and Saglia, R. and Sauvage, M. and Schneider, P. and Secroun, A. and Serrano, S. and Sureau, F. and Taylor, A. N. and Tereno, I. and Toledo-Moreo, R. and Valenziano, L. and Wang, Y. and Wetzstein, M. and Zoubian, J. (2020) Euclid: the selection of quiescent and star-forming galaxies using observed colours. Monthly Notices of the Royal Astronomical Society, 494 (2). pp. 2337-2354. ISSN 0035-8711. doi:10.1093/mnras/staa885.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Accepted Version
See Usage Policy.


Use this Persistent URL to link to this item:


The Euclid mission will observe well over a billion galaxies out to z ∼ 6 and beyond. This will offer an unrivalled opportunity to investigate several key questions for understanding galaxy formation and evolution. The first step for many of these studies will be the selection of a sample of quiescent and star-forming galaxies, as is often done in the literature by using well-known colour techniques such as the ‘UVJ’ diagram. However, given the limited number of filters available for the Euclid telescope, the recovery of such rest-frame colours will be challenging. We therefore investigate the use of observed Euclid colours, on their own and together with ground-based u-band observations, for selecting quiescent and star-forming galaxies. The most efficient colour combination, among the ones tested in this work, consists of the (u − VIS) and (VIS − J) colours. We find that this combination allows users to select a sample of quiescent galaxies complete to above ∼70 per cent and with less than 15 per cent contamination at redshifts in the range 0.75 < z < 1. For galaxies at high-z or without the u-band complementary observations, the (VIS − Y) and (J − H) colours represent a valid alternative, with >65 per cent completeness level and contamination below 20 per cent at 1 < z < 2 for finding quiescent galaxies. In comparison, the sample of quiescent galaxies selected with the traditional UVJ technique is only ∼20 per cent complete at z < 3, when recovering the rest-frame colours using mock Euclid observations. This shows that our new methodology is the most suitable one when only Euclid bands, along with u-band imaging, are available.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Bisigello, L.0000-0003-0492-4924
Conselice, C. J.0000-0003-1949-7638
Maraston, C.0000-0001-7711-3677
Moresco, M.0000-0002-7616-7136
Tortora, C.0000-0001-7958-6531
Castander, F. J.0000-0001-7316-4573
Cavuoti, S.0000-0002-3787-4196
Cimatti, A.0000-0002-4409-5633
Jahnke, K.0000-0003-3804-2137
Massey, R.0000-0002-6085-3780
Masters, D. C.0000-0001-5382-6138
Mei, S.0000-0002-2849-559X
Paltani, S.0000-0002-8108-9179
Rhodes, J.0000-0002-4485-8549
Roncarelli, M.0000-0001-9587-7822
Saglia, R.0000-0003-0378-7032
Additional Information:© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2020 March 12. Received 2020 March 10; in original form 2020 January 7. Published: 07 April 2020. UK acknowledges support from STFC. CC acknowledges the support of the STFC Cosmic Vision funding. CT acknowledges funding from the INAF PRIN-SKA 2017 programme The Euclid Consortium acknowledges the European Space Agency and the support of a number of agencies and institutes that have supported the development of Euclid, in particular the Academy of Finland, the Agenzia Spaziale Italiana, the Belgian Science Policy, the Canadian Euclid Consortium, the Centre National d’Etudes Spatiales, the Deutsches Zentrum für Luft- und Raumfahrt, the Danish Space Research Institute, the Fundacao para a Ciencia e a Tecnologia, the Ministerio de Economia y Competitividad, the National Aeronautics and Space Administration, the Netherlandse Onderzoekschool Voor Astronomie, the Norwegian Space Agency, the Romanian Space Agency, the State Secretariat for Education, Research and Innovation (SERI) at the Swiss Space Office (SSO), and the United Kingdom Space Agency. A detailed complete list is available on the Euclid website (
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)UNSPECIFIED
Istituto Nazionale di Astrofisica (INAF)PRIN-SKA 2017
European Space Agency (ESA)UNSPECIFIED
Academy of FinlandUNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Belgian Science Policy Office (BELSPO)UNSPECIFIED
Canadian Euclid ConsortiumUNSPECIFIED
Centre National d’Études Spatiales (CNES)UNSPECIFIED
Deutsches Zentrum für Luft- und Raumfahrt (DLR)UNSPECIFIED
Danish Space Research InstituteUNSPECIFIED
Fundacao para a Ciencia e a Tecnologia (FCT)UNSPECIFIED
Ministerio de Economia y Competitividad (MINECO)UNSPECIFIED
Nederlandse Onderzoekschool Voor Astronomie (NOVA)UNSPECIFIED
Norwegian Space AgencyUNSPECIFIED
Romanian Space AgencyUNSPECIFIED
State Secretariat for Education, Research and Innovation (SERI)UNSPECIFIED
Swiss Space Office (SSO)UNSPECIFIED
United Kingdom Space Agency (UKSA)UNSPECIFIED
Subject Keywords:galaxies: evolution – galaxies: general – galaxies: photometry
Issue or Number:2
Record Number:CaltechAUTHORS:20200611-120605467
Persistent URL:
Official Citation:L Bisigello, U Kuchner, C J Conselice, S Andreon, M Bolzonella, P-A Duc, B Garilli, A Humphrey, C Maraston, M Moresco, L Pozzetti, C Tortora, G Zamorani, N Auricchio, J Brinchmann, V Capobianco, J Carretero, F J Castander, M Castellano, S Cavuoti, A Cimatti, R Cledassou, G Congedo, L Conversi, L Corcione, M S Cropper, S Dusini, M Frailis, E Franceschi, P Franzetti, M Fumana, F Hormuth, H Israel, K Jahnke, S Kermiche, T Kitching, R Kohley, B Kubik, M Kunz, O Le Fèvre, S Ligori, P B Lilje, I Lloro, E Maiorano, O Marggraf, R Massey, D C Masters, S Mei, Y Mellier, G Meylan, C Padilla, S Paltani, F Pasian, V Pettorino, S Pires, G Polenta, M Poncet, F Raison, J Rhodes, M Roncarelli, E Rossetti, R Saglia, M Sauvage, P Schneider, A Secroun, S Serrano, F Sureau, A N Taylor, I Tereno, R Toledo-Moreo, L Valenziano, Y Wang, M Wetzstein, J Zoubian, Euclid: the selection of quiescent and star-forming galaxies using observed colours, Monthly Notices of the Royal Astronomical Society, Volume 494, Issue 2, May 2020, Pages 2337–2354,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103853
Deposited By: Tony Diaz
Deposited On:11 Jun 2020 20:53
Last Modified:16 Nov 2021 18:25

Repository Staff Only: item control page