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The MUSE Hubble Ultra Deep Field Survey
II. Spectroscopic redshifts and comparisons to color selections of high-redshift galaxies

H. Inami, R. Bacon, J. Brinchmann, J. Richard, T. Contini, S. Conseil, S. Hamer, M. Akhlaghi, N. Bouché, B. Clement, G Desprez, A. Drake, T. Hashimoto, F. Leclercq, M. V. Maseda, L. Michel-Dansac, M. Paalvast, L. Tresse, E. Ventou, W. Kollatschny, L. A. Boogaard, H. Finley, R. A. Marino, J. Schaye, L. Wisotzki

We have conducted a two-layered spectroscopic survey (1′ × 1′ ultra deep and 3′ × 3′ deep regions) in the Hubble Ultra Deep Field (HUDF) with the Multi Unit Spectroscopic Explorer (MUSE). The combination of a large field of view, high sensitivity, and wide wavelength coverage provides an order of magnitude improvement in spectroscopically confirmed redshifts in the HUDF; i.e., 1206 secure spectroscopic redshifts for Hubble Space Telescope (HST) continuum selected objects, which corresponds to 15% of the total (7904). The redshift distribution extends well beyond > 3 and to HST/F775W magnitudes as faint as ≈ 30 mag (AB, 1σ). In addition, 132 secure redshifts were obtained for sources with no HST counterparts that were discovered in the MUSE data cubes by a blind search for emission-line features. In total, we present 1338 high quality redshifts, which is a factor of eight increase compared with the previously known spectroscopic redshifts in the same field. We assessed redshifts mainly with the spectral features [O II] at z < 1.5 (473 objects) and Lyα at 2.9 < < 6.7 (692 objects). With respect to F775W magnitude, a 50% completeness is reached at 26.5 mag for ultra deep and 25.5 mag for deep fields, and the completeness remains ≳ 20% up to 28–29 mag and ≈ 27 mag, respectively. We used the determined redshifts to test continuum color selection (dropout) diagrams of high-z galaxies. The selection condition for F336W dropouts successfully captures ≈ 80% of the targeted z ~ 2.7 galaxies. However, for higher redshift selections (F435WF606W, and F775W dropouts), the success rates decrease to ≈ 20–40%. We empirically redefine the selection boundaries to make an attempt to improve them to ≈ 60%. The revised boundaries allow bluer colors that capture Lyα emitters with high Lyα equivalent widths falling in the broadbands used for the color-color selection. Along with this paper, we release the redshift and line flux catalog.

galaxies: high-redshift; galaxies: formation; galaxies: evolution; catalogs; surveys; Astrophysics - Astrophysics of Galaxies

Astronomy & Astrophysics
Volume 608, Article Number A2, Number of pages 26
2017 December

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia