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

Bisigello, L., Kuchner, U., Conselice, C. J., Andreon, S., Bolzonella, M., Duc, P.-A., et al. (2020). Euclid: the selection of quiescent and star-forming galaxies using observed colours. Monthly Notices of the Royal Astronomical Society, 494(2), 2337-2354. doi:10.1093/mnras/staa885.

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Bisigello, L., Author
Kuchner, U., Author
Conselice, C. J., Author
Andreon, S., Author
Bolzonella, M., Author
Duc, P.-A., Author
Garilli, B., Author
Humphrey, A., Author
Maraston, C., Author
Moresco, M., Author
Pozzetti, L., Author
Tortora, C., Author
Zamorani, G., Author
Auricchio, N., Author
Brinchmann, J., Author
Capobianco, V., Author
Carretero, J., Author
Castander, F. J., Author
Castellano, M., Author
Cavuoti, S., Author
Cimatti, A., AuthorCledassou, R., AuthorCongedo, G., AuthorConversi, L., AuthorCorcione, L., AuthorCropper, M. S., AuthorDusini, S., AuthorFrailis, M., AuthorFranceschi, E., AuthorFranzetti, P., AuthorFumana, M., AuthorHormuth, F., AuthorIsrael, H., AuthorJahnke, K., AuthorKermiche, S., AuthorKitching, T., AuthorKohley, R., AuthorKubik, B., AuthorKunz, M., AuthorLe Fèvre, O., AuthorLigori, S., AuthorLilje, P. B., AuthorLloro, I., AuthorMaiorano, E., AuthorMarggraf, O., AuthorMassey, R., AuthorMasters, D. C., AuthorMei, S., AuthorMellier, Y., AuthorMeylan, G., AuthorPadilla, C., AuthorPaltani, S., AuthorPasian, F., AuthorPettorino, V., AuthorPires, S., AuthorPolenta, G., AuthorPoncet, M., AuthorRaison, F.1, Author              Rhodes, J., AuthorRoncarelli, M., AuthorRossetti, E., AuthorSaglia, R.1, Author              Sauvage, M., AuthorSchneider, P., AuthorSecroun, A., AuthorSerrano, S., AuthorSureau, F., AuthorTaylor, A. N., AuthorTereno, I., AuthorToledo-Moreo, R., AuthorValenziano, L., AuthorWang, Y., AuthorWetzstein, M.2, Author              Zoubian, J., Author more..
1Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              
2Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              


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 Abstract: 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.


 Dates: 2020-04-07
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/staa885
Other: LOCALID: 3243567
 Degree: -



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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 494 (2) Sequence Number: - Start / End Page: 2337 - 2354 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150